446 lines
21 KiB
Python
446 lines
21 KiB
Python
"""Face separation and connected thickness for Depth Surface assets."""
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from .nodes import evaluate_field, store_float_attribute, store_boolean_attribute, remove_attributes, sample_field
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CUT_ATTRIBUTE = ".o_anyimage_depth_cut"
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def _math(group, operation, a, b=None):
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node = group.nodes.new("ShaderNodeMath")
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node.operation = operation
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for index, value in enumerate((a, b)):
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if value is None:
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continue
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if isinstance(value, (int, float)):
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node.inputs[index].default_value = value
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else:
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group.links.new(value, node.inputs[index])
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return node.outputs[0]
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def _remove_strip_faces(group, geometry, *, triangles=False):
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"""Delete boundary strips from one unchanged topology snapshot."""
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nodes, links = group.nodes, group.links
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def equals(value, count):
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compare = nodes.new("FunctionNodeCompare")
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compare.data_type, compare.operation = "INT", "EQUAL"
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links.new(value, compare.inputs[2])
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if isinstance(count, int):
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compare.inputs[3].default_value = count
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else:
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links.new(count, compare.inputs[3])
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return compare.outputs["Result"]
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def combine(operation, a, b):
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node = nodes.new("FunctionNodeIntegerMath")
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node.operation = operation
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links.new(a, node.inputs[0])
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links.new(b, node.inputs[1])
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return node.outputs[0]
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boundaries = []
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for offset in range(4):
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index = nodes.new("GeometryNodeInputIndex")
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corners = nodes.new("GeometryNodeCornersOfFace")
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links.new(index.outputs[0], corners.inputs["Face Index"])
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corner = nodes.new("GeometryNodeOffsetCornerInFace")
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corner.inputs["Offset"].default_value = offset
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links.new(corners.outputs["Corner Index"], corner.inputs["Corner Index"])
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edge = nodes.new("GeometryNodeEdgesOfCorner")
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links.new(corner.outputs["Corner Index"], edge.inputs["Corner Index"])
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sample = nodes.new("GeometryNodeFieldAtIndex")
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sample.data_type, sample.domain = "INT", "EDGE"
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links.new(edge.outputs["Next Edge Index"], sample.inputs["Index"])
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neighbors = nodes.new("GeometryNodeInputMeshEdgeNeighbors")
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links.new(neighbors.outputs["Face Count"], sample.inputs["Value"])
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boundaries.append(equals(sample.outputs["Value"], 1))
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opposite = combine(
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"MAXIMUM",
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combine("MULTIPLY", boundaries[0], boundaries[2]),
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combine("MULTIPLY", boundaries[1], boundaries[3]),
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)
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face = nodes.new("GeometryNodeInputMeshFaceNeighbors")
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selected = combine("MULTIPLY", equals(face.outputs["Vertex Count"], 4), opposite)
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if triangles:
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def sample(value, index, domain):
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node = nodes.new("GeometryNodeFieldAtIndex")
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node.data_type, node.domain = "INT", domain
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links.new(value, node.inputs["Value"])
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links.new(index, node.inputs["Index"])
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return node.outputs["Value"]
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def offset_corner(corner, offset):
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node = nodes.new("GeometryNodeOffsetCornerInFace")
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links.new(corner, node.inputs["Corner Index"])
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node.inputs["Offset"].default_value = offset
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return node.outputs["Corner Index"]
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def vertex(corner):
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node = nodes.new("GeometryNodeVertexOfCorner")
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links.new(corner, node.inputs["Corner Index"])
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return node.outputs["Vertex Index"]
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def boundary(corner):
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edge = nodes.new("GeometryNodeEdgesOfCorner")
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links.new(corner, edge.inputs["Corner Index"])
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count = nodes.new("GeometryNodeInputMeshEdgeNeighbors")
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return equals(sample(count.outputs["Face Count"], edge.outputs["Next Edge Index"], "EDGE"), 1)
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# Evaluate each internal edge as a symmetric pair of triangles.
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edge_index = nodes.new("GeometryNodeInputIndex")
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sides = []
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for side in (0, 1):
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corners = nodes.new("GeometryNodeCornersOfEdge")
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links.new(edge_index.outputs[0], corners.inputs["Edge Index"])
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corners.inputs["Sort Index"].default_value = side
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corner = corners.outputs["Corner Index"]
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face_index = nodes.new("GeometryNodeFaceOfCorner")
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links.new(corner, face_index.inputs["Corner Index"])
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face_size = nodes.new("GeometryNodeInputMeshFaceNeighbors")
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triangle = equals(sample(face_size.outputs["Vertex Count"], face_index.outputs["Face Index"], "FACE"), 3)
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end, tip = offset_corner(corner, 1), offset_corner(corner, 2)
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sides.append((triangle, vertex(corner), vertex(tip), boundary(end), boundary(tip)))
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a, b = sides
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same_direction = equals(a[1], b[1])
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same_order = combine("MAXIMUM", combine("MULTIPLY", a[3], b[3]), combine("MULTIPLY", a[4], b[4]))
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reverse_order = combine("MAXIMUM", combine("MULTIPLY", a[3], b[4]), combine("MULTIPLY", a[4], b[3]))
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pair = combine("MAXIMUM",
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combine("MULTIPLY", same_direction, reverse_order),
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combine("MULTIPLY", equals(same_direction, 0), same_order))
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neighbors = nodes.new("GeometryNodeInputMeshEdgeNeighbors")
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for condition in (equals(neighbors.outputs["Face Count"], 2), a[0], b[0], equals(equals(a[2], b[2]), 0)):
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pair = combine("MULTIPLY", pair, condition)
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# Explicit edge-to-face sampling marks both members without averaging
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# through neighboring vertices or iterating over newly exposed edges.
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face_index = nodes.new("GeometryNodeInputIndex")
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corners = nodes.new("GeometryNodeCornersOfFace")
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links.new(face_index.outputs[0], corners.inputs["Face Index"])
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boundary_count, paired = None, None
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for offset in range(3):
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corner = offset_corner(corners.outputs["Corner Index"], offset)
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edge = nodes.new("GeometryNodeEdgesOfCorner")
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links.new(corner, edge.inputs["Corner Index"])
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match = sample(pair, edge.outputs["Next Edge Index"], "EDGE")
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paired = match if paired is None else combine("MAXIMUM", paired, match)
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rim = boundary(corner)
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boundary_count = rim if boundary_count is None else combine("ADD", boundary_count, rim)
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triangle_selected = combine("MULTIPLY", equals(corners.outputs["Total"], 3),
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combine("MAXIMUM", paired, equals(boundary_count, 3)))
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selected = combine("MAXIMUM", selected, triangle_selected)
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delete = nodes.new("GeometryNodeDeleteGeometry")
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delete.domain, delete.mode = "FACE", "ALL"
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links.new(geometry, delete.inputs["Geometry"])
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links.new(selected, delete.inputs["Selection"])
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return delete.outputs["Geometry"]
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def sample_face_camera(group, image):
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"""Sample camera XYZ at each planar face's UV center."""
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nodes, links = group.nodes, group.links
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uv = nodes.new("GeometryNodeInputNamedAttribute")
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uv.data_type = "FLOAT_VECTOR"
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uv.inputs["Name"].default_value = "UVMap"
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face_uv = nodes.new("GeometryNodeFieldOnDomain")
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face_uv.data_type = "FLOAT_VECTOR"
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face_uv.domain = "FACE"
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links.new(uv.outputs["Attribute"], face_uv.inputs["Value"])
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texture = nodes.new("GeometryNodeImageTexture")
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texture.interpolation = "Linear"
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texture.extension = "EXTEND"
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links.new(image, texture.inputs["Image"])
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links.new(face_uv.outputs["Value"], texture.inputs["Vector"])
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return texture.outputs["Color"]
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def ray_distance(group, camera):
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"""Measure the distance from the camera origin to a camera-space point."""
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length = group.nodes.new("ShaderNodeVectorMath")
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length.operation = "LENGTH"
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group.links.new(camera, length.inputs[0])
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return length.outputs["Value"]
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def split_depth_surface(group, geometry, face_camera, strength, reference_depth, *,
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face_distance=None, face_center=None, triangles=False):
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"""Split relative ray-distance jumps over the base face-center spacing."""
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nodes, links = group.nodes, group.links
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if face_center is None:
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face_center = nodes.new("GeometryNodeInputPosition").outputs[0]
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face_camera = evaluate_field(group, face_camera, "FLOAT_VECTOR", "FACE")
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if face_distance is None:
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face_distance = ray_distance(group, face_camera)
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centers, depths = [], []
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for side in (0, 1):
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corner = nodes.new("GeometryNodeCornersOfEdge")
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corner.inputs["Sort Index"].default_value = side
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face = nodes.new("GeometryNodeFaceOfCorner")
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links.new(corner.outputs["Corner Index"], face.inputs["Corner Index"])
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for data_type, field, results in (
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("FLOAT_VECTOR", face_center, centers),
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("FLOAT", face_distance, depths),
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):
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sample = nodes.new("GeometryNodeFieldAtIndex")
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sample.data_type = data_type
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sample.domain = "FACE"
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links.new(face.outputs["Face Index"], sample.inputs["Index"])
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links.new(field, sample.inputs["Value"])
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results.append(sample.outputs["Value"])
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distance = nodes.new("ShaderNodeVectorMath")
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distance.operation = "DISTANCE"
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for index, center in enumerate(centers):
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links.new(center, distance.inputs[index])
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delta = _math(group, "ABSOLUTE", _math(group, "SUBTRACT", *depths))
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local_distance = _math(group, "MAXIMUM", _math(group, "MULTIPLY", _math(group, "ADD", *depths), 0.5), 1e-8)
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reference = _math(group, "MAXIMUM", reference_depth, 1e-8)
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# Uniform Scale cancels between the distance jump and local spacing correction.
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# Cross multiplication also avoids dividing by the local distance.
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selected = _math(
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group,
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"GREATER_THAN",
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_math(group, "MULTIPLY", _math(group, "MULTIPLY", delta, reference), strength),
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_math(group, "MULTIPLY", _math(group, "MULTIPLY", distance.outputs["Value"], local_distance), 2.5),
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)
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selected = _math(
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group,
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"MULTIPLY",
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selected,
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_math(group, "GREATER_THAN", distance.outputs["Value"], 0.0),
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)
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neighbors = nodes.new("GeometryNodeInputMeshEdgeNeighbors")
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selected = _math(
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group,
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"MULTIPLY",
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selected,
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_math(group, "COMPARE", neighbors.outputs["Face Count"], 2.0),
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)
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cut_edges = nodes.new("GeometryNodeFieldOnDomain")
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cut_edges.data_type = "FLOAT"
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cut_edges.domain = "EDGE"
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links.new(selected, cut_edges.inputs["Value"])
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cut_vertices = nodes.new("GeometryNodeFieldOnDomain")
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cut_vertices.data_type = "FLOAT"
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cut_vertices.domain = "POINT"
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links.new(cut_edges.outputs["Value"], cut_vertices.inputs["Value"])
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corners, cut = store_boolean_attribute(
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group, geometry, CUT_ATTRIBUTE,
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_math(group, "GREATER_THAN", cut_vertices.outputs["Value"], 0.0), domain="CORNER",
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)
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split = nodes.new("GeometryNodeSplitEdges")
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links.new(corners, split.inputs["Mesh"])
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links.new(selected, split.inputs["Selection"])
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enabled = _math(group, "GREATER_THAN", strength, 0.0)
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choose = nodes.new("GeometryNodeSwitch")
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choose.input_type = "GEOMETRY"
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links.new(enabled, choose.inputs["Switch"])
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links.new(geometry, choose.inputs["False"])
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links.new(_remove_strip_faces(group, split.outputs["Mesh"], triangles=triangles), choose.inputs["True"])
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return choose.outputs["Output"], face_camera, cut
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def build_surface_camera(group, original, separated, cut_vertex, strength, *, always_vertex=None):
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"""Change cut depth along the original ray, preserving every other vertex."""
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enabled = group.nodes.new("GeometryNodeSwitch")
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enabled.input_type = "BOOLEAN"
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group.links.new(_math(group, "GREATER_THAN", strength, 0.0), enabled.inputs["Switch"])
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enabled.inputs["False"].default_value = False
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group.links.new(cut_vertex, enabled.inputs["True"])
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if always_vertex is not None:
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combined = group.nodes.new("FunctionNodeBooleanMath")
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combined.operation = "OR"
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group.links.new(enabled.outputs["Output"], combined.inputs[0])
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group.links.new(always_vertex, combined.inputs[1])
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enabled = combined.outputs["Boolean"]
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else:
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enabled = enabled.outputs["Output"]
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original_axes = group.nodes.new("ShaderNodeSeparateXYZ")
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separated_axes = group.nodes.new("ShaderNodeSeparateXYZ")
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group.links.new(original, original_axes.inputs[0])
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group.links.new(separated, separated_axes.inputs[0])
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ratio = _math(
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group, "DIVIDE", separated_axes.outputs["Z"], original_axes.outputs["Z"]
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)
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projected = group.nodes.new("ShaderNodeVectorMath")
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projected.operation = "SCALE"
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group.links.new(original, projected.inputs[0])
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group.links.new(ratio, projected.inputs[3])
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choose = group.nodes.new("GeometryNodeSwitch")
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choose.input_type = "VECTOR"
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group.links.new(enabled, choose.inputs["Switch"])
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group.links.new(original, choose.inputs["False"])
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group.links.new(projected.outputs[0], choose.inputs["True"])
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return evaluate_field(group, choose.outputs["Output"], "FLOAT_VECTOR", "POINT")
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def thicken_depth_surface(group, geometry, thickness, normal_smooth=None, *,
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back_mask=None, weld_zero_thickness=False):
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"""Connect caps with single quads by source vertex and cap identity."""
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nodes, links = group.nodes, group.links
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position = nodes.new("GeometryNodeInputPosition")
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index = nodes.new("GeometryNodeInputIndex")
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# Encode identity in the construction geometry before extrusion. The source
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# surface remains a separate sampling input; no position or ID is stored.
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identity = nodes.new("ShaderNodeCombineXYZ")
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for operation, axis in (("MODULO", "X"), ("DIVIDE", "Z")):
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part = nodes.new("FunctionNodeIntegerMath")
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part.operation = operation
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part.inputs[1].default_value = 4096
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links.new(index.outputs[0], part.inputs[0])
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links.new(part.outputs[0], identity.inputs[axis])
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sheet = nodes.new("GeometryNodeSetPosition")
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links.new(geometry, sheet.inputs["Geometry"])
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links.new(identity.outputs[0], sheet.inputs["Position"])
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saved = sheet.outputs["Geometry"]
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layer_axes = nodes.new("ShaderNodeSeparateXYZ")
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links.new(position.outputs[0], layer_axes.inputs[0])
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row = nodes.new("FunctionNodeIntegerMath")
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row.operation = "MULTIPLY"
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row.inputs[1].default_value = 4096
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links.new(layer_axes.outputs["Z"], row.inputs[0])
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vertex = nodes.new("FunctionNodeIntegerMath")
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vertex.operation = "ADD"
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links.new(layer_axes.outputs["X"], vertex.inputs[0])
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links.new(row.outputs[0], vertex.inputs[1])
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source_index = vertex.outputs[0]
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source_position = sample_field(group, geometry, position.outputs[0], "FLOAT_VECTOR", index=source_index)
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source_thickness = sample_field(group, geometry, thickness, "FLOAT", index=source_index)
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extrude = nodes.new("GeometryNodeExtrudeMesh")
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extrude.mode = "FACES"
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extrude.inputs["Individual"].default_value = False
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extrusion_offset = nodes.new("ShaderNodeCombineXYZ")
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extrusion_offset.inputs["Y"].default_value = -1.0
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links.new(extrusion_offset.outputs[0], extrude.inputs["Offset"])
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links.new(saved, extrude.inputs["Mesh"])
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sides = nodes.new("GeometryNodeSeparateGeometry")
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sides.domain = "FACE"
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links.new(extrude.outputs["Mesh"], sides.inputs["Geometry"])
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links.new(extrude.outputs["Side"], sides.inputs["Selection"])
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offset = nodes.new("ShaderNodeCombineXYZ")
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offset.inputs["Y"].default_value = -1.0
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back = nodes.new("GeometryNodeSetPosition")
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links.new(saved, back.inputs["Geometry"])
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links.new(offset.outputs[0], back.inputs["Offset"])
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flip_back = nodes.new("GeometryNodeFlipFaces")
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links.new(back.outputs["Geometry"], flip_back.inputs["Mesh"])
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flip_sides = nodes.new("GeometryNodeFlipFaces")
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links.new(sides.outputs["Selection"], flip_sides.inputs["Mesh"])
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join = nodes.new("GeometryNodeJoinGeometry")
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rear = flip_back.outputs["Mesh"]
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rim = flip_sides.outputs["Mesh"]
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back_parts = nodes.new("GeometryNodeJoinGeometry")
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links.new(rear, back_parts.inputs["Geometry"])
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links.new(rim, back_parts.inputs["Geometry"])
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rear = back_parts.outputs["Geometry"]
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if back_mask is not None:
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rear = store_float_attribute(group, rear, back_mask, 1.0, domain="FACE")
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for value in (
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saved,
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rear,
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):
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links.new(value, join.inputs["Geometry"])
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construction = join.outputs["Geometry"]
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if weld_zero_thickness:
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positive = _math(group, "GREATER_THAN", source_thickness, 1e-12)
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flattened = nodes.new("ShaderNodeCombineXYZ")
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for axis in ("X", "Z"):
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links.new(layer_axes.outputs[axis], flattened.inputs[axis])
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links.new(_math(group, "MULTIPLY", positive, layer_axes.outputs["Y"]), flattened.inputs["Y"])
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collapse = nodes.new("GeometryNodeSetPosition")
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links.new(construction, collapse.inputs["Geometry"])
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links.new(flattened.outputs[0], collapse.inputs["Position"])
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construction = collapse.outputs["Geometry"]
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merge = nodes.new("GeometryNodeMergeByDistance")
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merge.mode = "ALL"
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merge.inputs["Distance"].default_value = 0.1
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links.new(construction, merge.inputs["Geometry"])
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displacement = nodes.new("ShaderNodeCombineXYZ")
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distance = _math(group, "MULTIPLY", layer_axes.outputs["Y"], source_thickness)
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links.new(distance, displacement.inputs["Y"])
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restored = nodes.new("ShaderNodeVectorMath")
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restored.operation = "ADD"
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links.new(source_position, restored.inputs[0])
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links.new(displacement.outputs[0], restored.inputs[1])
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result = nodes.new("GeometryNodeSetPosition")
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links.new(merge.outputs["Geometry"], result.inputs["Geometry"])
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links.new(restored.outputs[0], result.inputs["Position"])
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if normal_smooth is not None:
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normal = nodes.new("GeometryNodeInputNormal")
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blur = nodes.new("GeometryNodeBlurAttribute")
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blur.data_type = "FLOAT_VECTOR"
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blur.inputs["Iterations"].default_value = normal_smooth
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links.new(normal.outputs[0], blur.inputs["Value"])
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normalize = nodes.new("ShaderNodeVectorMath")
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normalize.operation = "NORMALIZE"
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links.new(blur.outputs[0], normalize.inputs[0])
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source_normal = sample_field(group, geometry, normalize.outputs[0], "FLOAT_VECTOR", index=source_index)
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normal_offset = nodes.new("ShaderNodeVectorMath")
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normal_offset.operation = "SCALE"
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links.new(source_normal, normal_offset.inputs[0])
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links.new(distance, normal_offset.inputs[3])
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links.new(normal_offset.outputs[0], restored.inputs[1])
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nodes.remove(displacement)
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return {
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"geometry": result.outputs["Geometry"],
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"front": source_position,
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"source_index": source_index,
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"position": restored.outputs[0],
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"position_input": result.inputs["Position"],
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}
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def _projection_math(nodes, operation):
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node = nodes.new("ShaderNodeMath")
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node.operation = operation
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return node
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def project_depth_surface(
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group, geometry, camera_position, uniform_scale, reference_depth, depth_scale, split_strength
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):
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"""Interpolate the rectangular plane into the model camera coordinates."""
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nodes, links = group.nodes, group.links
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scaled = nodes.new("ShaderNodeVectorMath")
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scaled.operation = "SCALE"
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links.new(camera_position, scaled.inputs[0])
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links.new(uniform_scale, scaled.inputs[3])
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separate = nodes.new("ShaderNodeSeparateXYZ")
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links.new(scaled.outputs["Vector"], separate.inputs["Vector"])
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relative_depth = _projection_math(nodes, "SUBTRACT")
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links.new(separate.outputs["Z"], relative_depth.inputs[0])
|
|
links.new(reference_depth, relative_depth.inputs[1])
|
|
front = _projection_math(nodes, "MULTIPLY")
|
|
links.new(relative_depth.outputs[0], front.inputs[0])
|
|
links.new(depth_scale, front.inputs[1])
|
|
|
|
negative_z = _projection_math(nodes, "MULTIPLY")
|
|
negative_z.inputs[1].default_value = -1.0
|
|
links.new(separate.outputs["Y"], negative_z.inputs[0])
|
|
projected = nodes.new("ShaderNodeCombineXYZ")
|
|
links.new(separate.outputs["X"], projected.inputs["X"])
|
|
links.new(front.outputs[0], projected.inputs["Y"])
|
|
links.new(negative_z.outputs[0], projected.inputs["Z"])
|
|
current_position = nodes.new("GeometryNodeInputPosition")
|
|
blend = nodes.new("ShaderNodeMix")
|
|
blend.data_type = "VECTOR"
|
|
blend.clamp_factor = False
|
|
links.new(depth_scale, blend.inputs[0])
|
|
links.new(current_position.outputs["Position"], blend.inputs[4])
|
|
links.new(projected.outputs["Vector"], blend.inputs[5])
|
|
blended_axes = nodes.new("ShaderNodeSeparateXYZ")
|
|
links.new(blend.outputs["Result"], blended_axes.inputs["Vector"])
|
|
surface_position = nodes.new("ShaderNodeCombineXYZ")
|
|
links.new(blended_axes.outputs["X"], surface_position.inputs["X"])
|
|
links.new(front.outputs[0], surface_position.inputs["Y"])
|
|
links.new(blended_axes.outputs["Z"], surface_position.inputs["Z"])
|
|
project_geometry = nodes.new("GeometryNodeSetPosition")
|
|
links.new(geometry, project_geometry.inputs["Geometry"])
|
|
links.new(surface_position.outputs["Vector"], project_geometry.inputs["Position"])
|
|
|
|
return remove_attributes(
|
|
group, project_geometry.outputs["Geometry"], CUT_ATTRIBUTE,
|
|
enabled=_math(group, "GREATER_THAN", split_strength, 0.0),
|
|
)
|