213 lines
12 KiB
Python
213 lines
12 KiB
Python
"""Build a quad panorama with periodic sampling and radial depth separation."""
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import math
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import bpy
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from ..common.depth_surface import (
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_math, split_depth_surface, build_surface_camera,
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)
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from ..common.nodes import (
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boolean_node, compare_node, float_input, group_input, interface_socket,
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prepare_node_group, evaluate_field, remove_attribute_pattern,
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)
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from ..common.material_slots import inherit_material_slots
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from ..common.boundary_smoothing import smooth_boundary_depth, smooth_cut_boundary
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def _quad_sphere(group, segments):
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nodes, links = group.nodes, group.links
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cube = nodes.new("GeometryNodeMeshCube")
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cube.inputs["Size"].default_value = (2, 2, 2)
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for axis in "XYZ":
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links.new(segments, cube.inputs[f"Vertices {axis}"])
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xyz = nodes.new("ShaderNodeSeparateXYZ")
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links.new(nodes.new("GeometryNodeInputPosition").outputs[0], xyz.inputs[0])
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squares = {axis: _math(group, "MULTIPLY", xyz.outputs[axis], xyz.outputs[axis]) for axis in "XYZ"}
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combine = nodes.new("ShaderNodeCombineXYZ")
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for axis, a, b in (("X", "Y", "Z"), ("Y", "Z", "X"), ("Z", "X", "Y")):
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half = _math(group, "DIVIDE", _math(group, "ADD", squares[a], squares[b]), 2)
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third = _math(group, "DIVIDE", _math(group, "MULTIPLY", squares[a], squares[b]), 3)
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root = _math(group, "SQRT", _math(group, "ADD", _math(group, "SUBTRACT", 1, half), third))
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links.new(_math(group, "MULTIPLY", xyz.outputs[axis], root), combine.inputs[axis])
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position = nodes.new("GeometryNodeSetPosition")
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links.new(cube.outputs["Mesh"], position.inputs["Geometry"])
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links.new(combine.outputs[0], position.inputs["Position"])
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return position.outputs["Geometry"]
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def build_image_depth_panorama_group():
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group = bpy.data.node_groups.new("O Image Depth Panorama", "GeometryNodeTree")
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group.is_modifier = group.use_fake_user = True
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interface_socket(group, "Geometry", "INPUT", "NodeSocketGeometry")
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subdivide = interface_socket(group, "Subdivide", "INPUT", "NodeSocketInt")
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subdivide.description = "Increase mesh density to represent finer shapes. Higher levels create more vertices and require more processing time."
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subdivide.default_value, subdivide.min_value, subdivide.max_value = 8, 0, 8
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dome = float_input(group, "Dome Radius", 50, minimum=1, maximum=100, subtype="DISTANCE")
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dome.description = "Radius of the sphere kept at Depth Scale 0, and where mask areas below Mask Threshold land."
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float_input(group, "Depth Scale", 1, maximum=1, subtype="FACTOR").description = "Blend between a sphere at zero and the estimated depth surface at one."
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float_input(group, "Depth Split", 0.1, maximum=1, subtype="FACTOR").description = "Split the mesh where depth changes abruptly. Scaled by Depth Scale: a flat projection stays whole, higher values detect smaller depth jumps."
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valid_only = interface_socket(group, "Depth Mask", "INPUT", "NodeSocketBool")
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valid_only.default_value = True
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valid_only.description = "Remove mesh areas marked invalid by the depth mask; with the mask off, they rest on the dome sphere."
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options = group.interface.new_panel("Options", default_closed=True)
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boundary_smooth = interface_socket(group, "Boundary Smooth", "INPUT", "NodeSocketInt", options)
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boundary_smooth.default_value, boundary_smooth.min_value, boundary_smooth.max_value = 2, 0, 16
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boundary_smooth.description = "Smooth depth and geometry near cut edges on the panorama surface. Zero disables boundary smoothing."
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float_input(group, "Mask Threshold", 0.9, maximum=0.99, subtype="FACTOR", parent=options).description = "Set the minimum depth mask value treated as valid. Higher values exclude more partially valid boundary areas."
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data = group.interface.new_panel("Data", default_closed=True)
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interface_socket(group, "Depth Image", "INPUT", "NodeSocketImage", data).hide_in_modifier = True
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interface_socket(group, "Geometry", "OUTPUT", "NodeSocketGeometry")
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nodes, links = group.nodes, group.links
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def uv(direction):
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normalize = nodes.new("ShaderNodeVectorMath")
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normalize.operation = "NORMALIZE"
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links.new(direction, normalize.inputs[0])
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xyz = nodes.new("ShaderNodeSeparateXYZ")
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links.new(normalize.outputs[0], xyz.inputs[0])
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longitude = _math(group, "DIVIDE", _math(group, "ARCTAN2", xyz.outputs["Y"], xyz.outputs["X"]), 2 * math.pi)
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z = _math(group, "MAXIMUM", -1, _math(group, "MINIMUM", 1, xyz.outputs["Z"]))
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latitude = _math(group, "SUBTRACT", 1, _math(group, "DIVIDE", _math(group, "ARCCOSINE", z), math.pi))
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return longitude, latitude, xyz.outputs["Z"]
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def combine(u, v):
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node = nodes.new("ShaderNodeCombineXYZ")
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links.new(u, node.inputs["X"])
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links.new(v, node.inputs["Y"])
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return node.outputs[0]
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def texture(coordinates, interpolation):
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inputs = group_input(nodes, {"Depth Image"})
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info = nodes.new("GeometryNodeImageInfo")
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links.new(inputs.outputs["Depth Image"], info.inputs["Image"])
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axes = nodes.new("ShaderNodeSeparateXYZ")
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links.new(coordinates, axes.inputs[0])
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half_pixel = _math(group, "DIVIDE", 0.5, info.outputs["Height"])
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v = _math(group, "MAXIMUM", half_pixel,
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_math(group, "MINIMUM", axes.outputs["Y"], _math(group, "SUBTRACT", 1, half_pixel)))
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node = nodes.new("GeometryNodeImageTexture")
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node.interpolation, node.extension = interpolation, "REPEAT"
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links.new(inputs.outputs["Depth Image"], node.inputs["Image"])
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links.new(combine(axes.outputs["X"], v), node.inputs["Vector"])
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return node.outputs["Color"]
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def depth(coordinates):
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linear, nearest = texture(coordinates, "Linear"), texture(coordinates, "Closest")
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alphas = []
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for color in (linear, nearest):
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separate = nodes.new("FunctionNodeSeparateColor")
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links.new(color, separate.inputs["Color"])
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alphas.append(separate.outputs["Alpha"])
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choose = nodes.new("GeometryNodeSwitch")
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choose.input_type = "RGBA"
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links.new(compare_node(group, "LESS_THAN", alphas[0],
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_math(group, "SUBTRACT", alphas[1], 1e-6)), choose.inputs["Switch"])
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links.new(linear, choose.inputs["False"])
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links.new(nearest, choose.inputs["True"])
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return choose.outputs[0], alphas[1]
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inputs = group_input(nodes, {"Subdivide"})
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sphere = _quad_sphere(group, _math(group, "ADD", _math(group, "POWER", 2, inputs.outputs["Subdivide"]), 1))
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position = nodes.new("GeometryNodeInputPosition").outputs[0]
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longitude, latitude, z = uv(position)
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coordinates = evaluate_field(group, combine(longitude, latitude), "FLOAT_VECTOR", "POINT")
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face = nodes.new("GeometryNodeFieldOnDomain")
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face.data_type, face.domain = "FLOAT_VECTOR", "FACE"
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links.new(position, face.inputs["Value"])
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face_u, face_v, _ = uv(face.outputs["Value"])
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correction = _math(group, "ROUND", _math(group, "SUBTRACT", face_u, longitude))
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choose = nodes.new("GeometryNodeSwitch")
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choose.input_type = "FLOAT"
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links.new(compare_node(group, "GREATER_THAN", _math(group, "ABSOLUTE", z), 0.999999), choose.inputs["Switch"])
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links.new(_math(group, "ADD", longitude, correction), choose.inputs["False"])
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links.new(face_u, choose.inputs["True"])
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uv_map = nodes.new("GeometryNodeStoreNamedAttribute")
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uv_map.data_type, uv_map.domain = "FLOAT2", "CORNER"
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uv_map.inputs["Name"].default_value = "UVMap"
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links.new(sphere, uv_map.inputs["Geometry"])
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links.new(combine(choose.outputs[0], latitude), uv_map.inputs["Value"])
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pixel, _ = depth(coordinates)
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pixel = evaluate_field(group, pixel, "FLOAT_VECTOR", "POINT")
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# Both the mask and the depth of a face are read at its centre, like Depth Plane.
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face_camera, face_alpha = depth(combine(face_u, face_v))
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face_alpha = evaluate_field(group, face_alpha, "FLOAT", "FACE")
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threshold_input = group_input(nodes, {"Mask Threshold"})
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invalid = compare_node(group, "LESS_THAN", face_alpha, threshold_input.outputs["Mask Threshold"])
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protected = uv_map.outputs["Geometry"]
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separate = nodes.new("GeometryNodeSeparateGeometry")
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separate.domain = "FACE"
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links.new(protected, separate.inputs["Geometry"])
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links.new(invalid, separate.inputs["Selection"])
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controls = group_input(nodes, {"Depth Split", "Depth Scale"})
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strength = controls.outputs["Depth Split"]
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radial = nodes.new("ShaderNodeSeparateXYZ")
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links.new(face_camera, radial.inputs[0])
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geometry, corner_camera, cut_vertex = split_depth_surface(
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group, separate.outputs["Inverted"], face_camera, strength, 1.0, controls.outputs["Depth Scale"],
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face_distance=radial.outputs["X"], face_center=face.outputs["Value"],
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)
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distance = build_surface_camera(group, pixel, corner_camera, cut_vertex, strength)
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axes = nodes.new("ShaderNodeSeparateXYZ")
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links.new(distance, axes.inputs[0])
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distance = smooth_boundary_depth(group, axes.outputs["X"])
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dome_radius = group_input(nodes, {"Dome Radius"}).outputs["Dome Radius"]
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radius = _math(
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group, "ADD", dome_radius,
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_math(group, "MULTIPLY", controls.outputs["Depth Scale"],
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_math(group, "SUBTRACT", distance, dome_radius)),
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)
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radial = nodes.new("ShaderNodeVectorMath")
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radial.operation = "SCALE"
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links.new(position, radial.inputs[0])
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links.new(radius, radial.inputs[3])
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deform = nodes.new("GeometryNodeSetPosition")
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links.new(geometry, deform.inputs["Geometry"])
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links.new(radial.outputs[0], deform.inputs["Position"])
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geometry = remove_attribute_pattern(group, deform.outputs[0], "_o_*")
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geometry = smooth_cut_boundary(group, geometry, cut_vertex, outline_scale=1.0)
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# The excluded faces rest on the dome sphere and relax along their own boundary.
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domed = nodes.new("ShaderNodeVectorMath")
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domed.operation = "SCALE"
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links.new(position, domed.inputs[0])
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links.new(dome_radius, domed.inputs[3])
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resting = nodes.new("GeometryNodeSetPosition")
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links.new(separate.outputs["Selection"], resting.inputs["Geometry"])
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links.new(domed.outputs[0], resting.inputs["Position"])
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resting = smooth_cut_boundary(group, resting.outputs["Geometry"], outline_scale=1.0)
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joined = nodes.new("GeometryNodeJoinGeometry")
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links.new(geometry, joined.inputs["Geometry"])
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links.new(resting, joined.inputs["Geometry"])
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# A flat projection without the mask is the dome sphere alone: no split, no seam.
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dome_sphere = nodes.new("GeometryNodeSetPosition")
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links.new(protected, dome_sphere.inputs["Geometry"])
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links.new(domed.outputs[0], dome_sphere.inputs["Position"])
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cull_controls = group_input(nodes, {"Depth Mask"})
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dome_only = boolean_node(
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group,
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"AND",
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boolean_node(group, "NOT", compare_node(group, "GREATER_THAN", controls.outputs["Depth Scale"], 0.0)),
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boolean_node(group, "NOT", cull_controls.outputs["Depth Mask"]),
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)
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unmasked = nodes.new("GeometryNodeSwitch")
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unmasked.input_type = "GEOMETRY"
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links.new(dome_only, unmasked.inputs["Switch"])
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links.new(joined.outputs["Geometry"], unmasked.inputs["False"])
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links.new(dome_sphere.outputs["Geometry"], unmasked.inputs["True"])
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cull = nodes.new("GeometryNodeSwitch")
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cull.input_type = "GEOMETRY"
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links.new(cull_controls.outputs["Depth Mask"], cull.inputs["Switch"])
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links.new(unmasked.outputs["Output"], cull.inputs["False"])
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links.new(geometry, cull.inputs["True"])
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flip = nodes.new("GeometryNodeFlipFaces")
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links.new(cull.outputs["Output"], flip.inputs["Mesh"])
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smooth = nodes.new("GeometryNodeSetShadeSmooth")
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smooth.domain = "FACE"
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smooth.inputs["Shade Smooth"].default_value = True
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links.new(flip.outputs["Mesh"], smooth.inputs["Geometry"])
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geometry = inherit_material_slots(group, smooth.outputs[0], group_input(nodes, {"Geometry"}).outputs["Geometry"])
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output = nodes.new("NodeGroupOutput")
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links.new(geometry, output.inputs["Geometry"])
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prepare_node_group(group)
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return group
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