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94 lines
3.7 KiB
Python
94 lines
3.7 KiB
Python
"""
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Copyright (c) Contributors to the Open 3D Engine Project
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SPDX-License-Identifier: Apache-2.0 OR MIT
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"""
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import Icosahedron
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import WhiteBoxMath as whiteBoxMath
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import WhiteBoxInit as init
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import argparse
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import azlmbr.legacy.general as general
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import azlmbr.bus as bus
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import azlmbr.whitebox.api as api
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# usage: pyRunFile path/to/file/sphere.py <subdivisions>
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# get the midpoint of v1 and v2 from created_midpoints if already made, otherwise create new one
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def get_midpoint_vertex(whiteBoxMesh, v1, v2, radius, created_midpoints):
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# get the index of the vertices to look them up
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index1 = v1.Index()
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index2 = v2.Index()
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# search created_midpoints to see if this midpoint has already been made
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# we store edges as tuples but keep in mind the edge (v1, v2) == (v2, v1) so we search both
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if (index1, index2) in created_midpoints:
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return created_midpoints.get((index1, index2))
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if (index2, index1) in created_midpoints:
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return created_midpoints.get((index2, index1))
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# create the new midpoint vertex and store in created_midpoints
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pos1 = whiteBoxMesh.VertexPosition(v1)
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pos2 = whiteBoxMesh.VertexPosition(v2)
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midpoint = whiteBoxMesh.AddVertex(whiteBoxMath.normalize_midpoint(pos1, pos2, radius))
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created_midpoints.update({(index1, index2): midpoint})
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return midpoint
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# divide each triangular face into four smaller faces
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def subdivide_faces(whiteBoxMesh, faces, radius):
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new_faces = []
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created_midpoints = dict()
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for faceVertHandles in faces:
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# get each vertex
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v0 = faceVertHandles.VertexHandles[0]
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v1 = faceVertHandles.VertexHandles[1]
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v2 = faceVertHandles.VertexHandles[2]
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# get the vertex representing the midpoint of each of the edges
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v3 = get_midpoint_vertex(whiteBoxMesh, v0, v1, radius, created_midpoints)
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v4 = get_midpoint_vertex(whiteBoxMesh, v1, v2, radius, created_midpoints)
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v5 = get_midpoint_vertex(whiteBoxMesh, v0, v2, radius, created_midpoints)
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# create four subdivided faces for each original face
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new_faces.append(api.util_MakeFaceVertHandles(v0, v3, v5))
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new_faces.append(api.util_MakeFaceVertHandles(v3, v1, v4))
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new_faces.append(api.util_MakeFaceVertHandles(v4, v2, v5))
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new_faces.append(api.util_MakeFaceVertHandles(v3, v4, v5))
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return new_faces
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# create sphere by subdividing an icosahedron
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def create_sphere(whiteBoxMesh, subdivisions=2, radius=0.55):
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# create icosahedron faces and subdivide them to create a sphere
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icosahedron_faces = Icosahedron.create_icosahedron_faces(whiteBoxMesh, radius)
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for division in range (0, subdivisions):
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icosahedron_faces = subdivide_faces(whiteBoxMesh, icosahedron_faces, radius)
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for face in icosahedron_faces:
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whiteBoxMesh.AddPolygon([face])
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if __name__ == "__main__":
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# cmdline arguments
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parser = argparse.ArgumentParser(description='Creates a sphere shaped white box mesh.')
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parser.add_argument('subdivisions', nargs='?', default=3, choices=range(0, 5), type=int, help='number of subdivisions to form sphere from icosahedron')
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parser.add_argument('radius', nargs='?', default=0.55, type=float, help='radius of the sphere')
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args = parser.parse_args()
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# initialize whiteBoxMesh
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whiteBoxEntity = init.create_white_box_entity("WhiteBox-Sphere")
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whiteBoxMeshComponent = init.create_white_box_component(whiteBoxEntity)
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whiteBoxMesh = init.create_white_box_handle(whiteBoxMeshComponent)
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# clear whiteBoxMesh to make a sphere from scratch
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whiteBoxMesh.Clear()
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create_sphere(whiteBoxMesh, args.subdivisions, args.radius)
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# update whiteBoxMesh
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init.update_white_box(whiteBoxMesh, whiteBoxMeshComponent)
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