337 lines
17 KiB
Python
337 lines
17 KiB
Python
"""Build O Image Depth Cutout."""
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import bpy
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from anyimage.operators.cutout_tool.shape import NORMAL_REDUCTION_ATTRIBUTE_NAME
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from ..common.nodes import (
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interface_socket, group_input, float_input, boolean_node, read_float_attribute, read_vector_attribute,
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store_float_attribute, store_vector_attribute, remove_attribute_pattern,
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prepare_node_group, evaluate_field, compare_node,
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)
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from ..common.boundary_smoothing import smooth_cut_boundary
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from ..common.cutout import _position_field, _shade_output
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from ..common.depth_surface import _math, project_depth_surface, build_surface_camera, split_depth_surface, sample_face_camera
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from ..common.smoothing import edge_boundary_field
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from ..common.cutout_boundary import remove_boundary_triangles, taper_split_profile
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NODE_GROUP_NAME = "O Image Depth Cutout"
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FRONT_NORMAL_ATTRIBUTE = "_o_front_normal"
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BALLOON_THICKNESS_BASE = 1.0
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NORMAL_SMOOTH_ITERATIONS = 256
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SOLID_WELD_SCALE = 1e-3
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def build_normal_weight(group, is_shell, profile):
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"""Keep shell smoothing and let the balloon profile drive the blend."""
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weight = group.nodes.new("GeometryNodeSwitch")
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weight.input_type = "FLOAT"
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group.links.new(is_shell, weight.inputs["Switch"])
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group.links.new(profile, weight.inputs["False"])
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weight.inputs["True"].default_value = 0.0
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return weight.outputs[0]
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def build_profile_weight(group, geometry):
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"""Normalize the corrected balloon profile into a zero to one blend weight."""
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profile = read_float_attribute(group, "o_balloon")
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statistics = group.nodes.new("GeometryNodeAttributeStatistic")
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statistics.data_type, statistics.domain = "FLOAT", "POINT"
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group.links.new(geometry, statistics.inputs["Geometry"])
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group.links.new(profile, statistics.inputs["Attribute"])
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return _math(
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group, "DIVIDE", profile,
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_math(group, "MAXIMUM", statistics.outputs["Max"], 1e-6),
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)
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def build_island_normal(group, normal):
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"""Average the smoothed normals of one connected mesh island."""
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nodes, links = group.nodes, group.links
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island = nodes.new("GeometryNodeInputMeshIsland")
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accumulate = nodes.new("GeometryNodeAccumulateField")
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accumulate.data_type, accumulate.domain = "FLOAT_VECTOR", "POINT"
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links.new(normal, accumulate.inputs["Value"])
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links.new(island.outputs["Island Index"], accumulate.inputs["Group Index"])
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normalize = nodes.new("ShaderNodeVectorMath")
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normalize.operation = "NORMALIZE"
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links.new(accumulate.outputs["Total"], normalize.inputs[0])
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return normalize.outputs["Vector"]
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def build_smoothed_normals(group):
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"""Return the smoothed normals and the average normal of each mesh island."""
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nodes, links = group.nodes, group.links
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normal = group.nodes.new("GeometryNodeInputNormal")
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blur = group.nodes.new("GeometryNodeBlurAttribute")
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blur.data_type = "FLOAT_VECTOR"
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links.new(normal.outputs[0], blur.inputs["Value"])
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blur.inputs["Iterations"].default_value = NORMAL_SMOOTH_ITERATIONS
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smoothed = blur.outputs[0]
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return smoothed, build_island_normal(group, smoothed)
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def build_normal_direction(group, controls, smoothed, average, weight):
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"""Blend the smoothed normal against the island average normal."""
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nodes, links = group.nodes, group.links
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difference = group.nodes.new("ShaderNodeVectorMath")
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difference.operation = "SUBTRACT"
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links.new(average, difference.inputs[0])
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links.new(smoothed, difference.inputs[1])
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lean = _math(
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group, "MULTIPLY", _math(group, "SUBTRACT", 1.0, weight),
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controls.outputs["Edge Turn"],
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)
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blend = _math(group, "ADD", weight, lean)
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offset = group.nodes.new("ShaderNodeVectorMath")
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offset.operation = "SCALE"
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links.new(difference.outputs["Vector"], offset.inputs[0])
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links.new(blend, offset.inputs[3])
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direction = group.nodes.new("ShaderNodeVectorMath")
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direction.operation = "ADD"
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links.new(smoothed, direction.inputs[0])
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links.new(offset.outputs["Vector"], direction.inputs[1])
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normalize = group.nodes.new("ShaderNodeVectorMath")
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normalize.operation = "NORMALIZE"
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links.new(direction.outputs["Vector"], normalize.inputs[0])
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return normalize.outputs["Vector"]
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def build_inflation_amount(group, controls, is_shell):
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"""Balloon scales the profile by Depth Scale, Shell moves a fixed distance."""
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nodes, links = group.nodes, group.links
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thickness = _math(
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group, "MULTIPLY", controls.outputs["Thickness"],
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_math(group, "ADD", BALLOON_THICKNESS_BASE, controls.outputs["Depth Scale"]),
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)
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balloon = _math(
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group, "MULTIPLY", read_float_attribute(group, "o_balloon"), thickness,
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)
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amount = nodes.new("GeometryNodeSwitch")
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amount.input_type = "FLOAT"
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links.new(is_shell, amount.inputs["Switch"])
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links.new(balloon, amount.inputs["False"])
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links.new(controls.outputs["Shell Thickness"], amount.inputs["True"])
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return amount.outputs[0]
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def build_solid(group, surface, amount, normal, is_shell, controls, weld_distance):
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"""Inflate the projected surface into a front leaf, wall and rear leaf."""
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nodes, links = group.nodes, group.links
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def offset(distance):
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result = nodes.new("ShaderNodeVectorMath")
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result.operation = "SCALE"
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links.new(normal, result.inputs[0])
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links.new(distance, result.inputs[3])
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return result.outputs[0]
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# The front leaf moves by Thickness x o_balloon x Front Inflation, independent of
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# the Depth Scale that scales the rear recession.
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inflation = _math(
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group, "MULTIPLY",
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_math(
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group, "MULTIPLY", read_float_attribute(group, "o_balloon"),
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controls.outputs["Thickness"],
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),
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controls.outputs["Front Inflation"],
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)
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front_amount = nodes.new("GeometryNodeSwitch")
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front_amount.input_type = "FLOAT"
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links.new(is_shell, front_amount.inputs["Switch"])
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links.new(inflation, front_amount.inputs["False"])
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front_amount.inputs["True"].default_value = 0.0
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front = nodes.new("GeometryNodeSetPosition")
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links.new(surface, front.inputs["Geometry"])
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links.new(offset(front_amount.outputs[0]), front.inputs["Offset"])
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# The rear leaf inflates along the negated front direction, straight from the
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# untouched surface so the front offset cannot drag it along.
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span = _math(group, "MULTIPLY", amount, -1.0)
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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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links.new(surface, extrude.inputs["Mesh"])
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links.new(offset(span), extrude.inputs["Offset"])
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# The rear surface smooths in proportion to its thickness and the balloon profile,
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# so thin shells and cut boundaries keep their exact positions.
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thickness = nodes.new("GeometryNodeSwitch")
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thickness.input_type = "FLOAT"
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links.new(is_shell, thickness.inputs["Switch"])
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links.new(controls.outputs["Thickness"], thickness.inputs["False"])
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links.new(controls.outputs["Shell Thickness"], thickness.inputs["True"])
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weight = _math(
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group, "MULTIPLY", _math(group, "MINIMUM", thickness.outputs[0], 1.0),
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read_float_attribute(group, "o_balloon"),
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)
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position = nodes.new("GeometryNodeInputPosition")
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blur = nodes.new("GeometryNodeBlurAttribute")
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blur.data_type = "FLOAT_VECTOR"
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blur.inputs["Weight"].default_value = 1.0
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links.new(position.outputs["Position"], blur.inputs["Value"])
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links.new(group_input(nodes, {"Back Smooth"}).outputs["Back Smooth"], blur.inputs["Iterations"])
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difference = nodes.new("ShaderNodeVectorMath")
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difference.operation = "SUBTRACT"
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links.new(blur.outputs["Value"], difference.inputs[0])
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links.new(position.outputs["Position"], difference.inputs[1])
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smooth_offset = nodes.new("ShaderNodeVectorMath")
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smooth_offset.operation = "SCALE"
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links.new(difference.outputs["Vector"], smooth_offset.inputs[0])
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links.new(weight, smooth_offset.inputs[3])
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smoothed = nodes.new("GeometryNodeSetPosition")
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links.new(extrude.outputs["Mesh"], smoothed.inputs["Geometry"])
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links.new(smooth_offset.outputs["Vector"], smoothed.inputs["Offset"])
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# Extruding against the normal leaves the rear leaf and wall facing inward.
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flipped = nodes.new("GeometryNodeFlipFaces")
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links.new(smoothed.outputs["Geometry"], flipped.inputs["Mesh"])
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rear = store_float_attribute(
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group, flipped.outputs["Mesh"], NORMAL_REDUCTION_ATTRIBUTE_NAME, 1.0,
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)
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join = nodes.new("GeometryNodeJoinGeometry")
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links.new(front.outputs["Geometry"], join.inputs["Geometry"])
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links.new(rear, join.inputs["Geometry"])
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merge = nodes.new("GeometryNodeMergeByDistance")
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merge.mode = "ALL"
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links.new(weld_distance, merge.inputs["Distance"])
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links.new(join.outputs["Geometry"], merge.inputs["Geometry"])
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return merge.outputs["Geometry"]
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def _build_depth_surface(group, geometry, controls):
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"""Project the depth image and inflate the projected surface into a solid."""
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links = group.links
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split = controls.outputs["Depth Split"]
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image = controls.outputs["Depth Image"]
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scale = controls.outputs["Uniform Scale"]
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geometry, corner_camera, cut_vertex = split_depth_surface(
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group, geometry, sample_face_camera(group, image), split, controls.outputs["Reference Depth"],
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controls.outputs["Depth Scale"], triangles=True,
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)
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geometry = remove_boundary_triangles(group, geometry)
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boundary = edge_boundary_field(group.nodes, group.links)
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rim = evaluate_field(group, boundary, "FLOAT", "POINT")
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cut = evaluate_field(
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group, boolean_node(group, "AND", boundary, cut_vertex), "FLOAT", "POINT",
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)
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# Only the Depth Split cuts taper the profile; the outline keeps its thickness.
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geometry = taper_split_profile(group, geometry, cut)
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camera = build_surface_camera(
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group, _position_field(group, image), corner_camera, cut_vertex, split,
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)
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projection = project_depth_surface(
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group, geometry, camera, scale, controls.outputs["Reference Depth"], controls.outputs["Depth Scale"],
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)
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projection = smooth_cut_boundary(group, projection, cut_vertex, boundary=rim)
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# Clamped depth pixels can collapse adjacent outline samples after projection.
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edge = group.nodes.new("GeometryNodeInputMeshEdgeVertices")
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length = group.nodes.new("ShaderNodeVectorMath")
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length.operation = "DISTANCE"
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links.new(edge.outputs["Position 1"], length.inputs[0])
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links.new(edge.outputs["Position 2"], length.inputs[1])
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typical = group.nodes.new("GeometryNodeAttributeStatistic")
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typical.data_type, typical.domain = "FLOAT", "EDGE"
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links.new(projection, typical.inputs["Geometry"])
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links.new(length.outputs["Value"], typical.inputs["Attribute"])
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merge = group.nodes.new("GeometryNodeMergeByDistance")
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merge.mode = "CONNECTED"
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links.new(projection, merge.inputs["Geometry"])
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links.new(_math(group, "MULTIPLY", typical.outputs["Mean"], 1e-6), merge.inputs["Distance"])
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projection = merge.outputs["Geometry"]
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# The mode field is shared by the thickness and direction choices.
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mode = group.nodes.new("GeometryNodeMenuSwitch")
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mode.data_type = "BOOLEAN"
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for item, name in zip(mode.enum_items, ("Balloon", "Shell")):
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item.name = name
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links.new(controls.outputs["Mode"], mode.inputs["Menu"])
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mode.inputs["Balloon"].default_value = False
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mode.inputs["Shell"].default_value = True
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is_shell = mode.outputs[0]
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amount = build_inflation_amount(group, controls, is_shell)
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statistics = group.nodes.new("GeometryNodeAttributeStatistic")
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statistics.data_type, statistics.domain = "FLOAT", "POINT"
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links.new(projection, statistics.inputs["Geometry"])
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links.new(amount, statistics.inputs["Attribute"])
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has_thickness = compare_node(group, "GREATER_THAN", statistics.outputs["Max"], 1e-6)
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profile = build_profile_weight(group, projection)
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smoothed, average = build_smoothed_normals(group)
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weight = build_normal_weight(group, is_shell, profile)
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# Material normal strength: the balloon profile gates it, Depth Scale attenuates it.
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inflated = group.nodes.new("GeometryNodeSwitch")
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inflated.input_type = "FLOAT"
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links.new(is_shell, inflated.inputs["Switch"])
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links.new(profile, inflated.inputs["False"])
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inflated.inputs["True"].default_value = 1.0
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normal_strength = group.nodes.new("GeometryNodeSwitch")
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normal_strength.input_type = "FLOAT"
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links.new(has_thickness, normal_strength.inputs["Switch"])
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normal_strength.inputs["False"].default_value = 1.0
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links.new(inflated.outputs[0], normal_strength.inputs["True"])
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reduction = _math(
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group, "SUBTRACT", 1.0,
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_math(group, "MULTIPLY", controls.outputs["Depth Scale"], normal_strength.outputs[0]),
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)
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projection = store_float_attribute(
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group, projection, NORMAL_REDUCTION_ATTRIBUTE_NAME, reduction,
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)
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# The rear leaf inflates along the negated front direction, so one direction is
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# carried across the extrusion instead of being re-evaluated on the moved surface.
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projection = store_vector_attribute(
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group, projection, FRONT_NORMAL_ATTRIBUTE,
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build_normal_direction(group, controls, smoothed, average, weight),
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)
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solid = build_solid(
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group, projection, amount,
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read_vector_attribute(group, FRONT_NORMAL_ATTRIBUTE),
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is_shell, controls,
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_math(group, "MULTIPLY", typical.outputs["Mean"], SOLID_WELD_SCALE),
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)
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shaped = group.nodes.new("GeometryNodeSwitch")
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shaped.input_type = "GEOMETRY"
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links.new(has_thickness, shaped.inputs["Switch"])
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links.new(projection, shaped.inputs["False"])
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links.new(solid, shaped.inputs["True"])
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return remove_attribute_pattern(group, shaped.outputs[0], "_o_*")
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def build_image_depth_cutout_group():
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name = NODE_GROUP_NAME
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existing = bpy.data.node_groups.get(name)
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if existing is not None:
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return existing
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group = bpy.data.node_groups.new(name, 'GeometryNodeTree')
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group.is_modifier, group.use_fake_user = (True, True)
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group.color_tag = 'GEOMETRY'
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interface_socket(group, 'Geometry', 'INPUT', 'NodeSocketGeometry')
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interface_socket(group, 'Mode', 'INPUT', 'NodeSocketMenu')
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float_input(group, 'Thickness', 0.0, maximum=2.0).description = 'Control how much the surface bulges in Balloon mode. Zero removes the bulge.'
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float_input(group, 'Shell Thickness', 0.0, maximum=1.0, subtype='DISTANCE').description = 'Add thickness behind the original surface while keeping the front surface in place.'
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float_input(group, 'Depth Scale', 1.0, maximum=2.0)
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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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options = group.interface.new_panel(name='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 = 4, 0, 16
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boundary_smooth.description = 'Smooth geometry near the original outline and Depth Split edges. Zero disables boundary smoothing.'
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back_smooth = interface_socket(group, 'Back Smooth', 'INPUT', 'NodeSocketInt', options)
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back_smooth.default_value, back_smooth.min_value, back_smooth.max_value = 8, 0, 16
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back_smooth.description = 'Soften the rear surface where the balloon is thick. The effect follows Thickness and the balloon profile, so thin geometry and cut boundaries keep their positions.'
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float_input(group, 'Edge Turn', 2.0, minimum=-3.0, maximum=3.0, parent=options).description = 'Turn the outline direction: zero follows the smoothed normal, one reaches the island average normal, two mirrors the smoothed normal across it, and higher or negative values keep turning either way.'
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float_input(group, 'Front Inflation', 0.2, maximum=1, subtype='FACTOR', parent=options).description = 'Control how much the front surface bulges in Balloon mode, as a share of the balloon thickness. Zero keeps the original front surface.'
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float_input(group, 'Reference Depth', 1.0, subtype='DISTANCE', parent=options)
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data = group.interface.new_panel(name='Data', default_closed=True)
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float_input(group, 'Uniform Scale', 1.0, parent=data).hide_in_modifier = 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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controls = group_input(group.nodes, set())
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geometry = _build_depth_surface(group, controls.outputs['Geometry'], controls)
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_shade_output(group, geometry)
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prepare_node_group(group)
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for item in group.interface.items_tree:
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if item.item_type != 'SOCKET' or item.in_out != 'INPUT':
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continue
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if item.name == 'Mode':
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item.default_value = 'Balloon'
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elif item.name == 'Shell Thickness':
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item.name = 'Thickness'
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return group
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