9a5fc54f12
- changed camelCase variables to under_case
- wrapped lines that were longer than 80 chars
- used @property decorator
- changed the cc refine test to print before running refine
- refine seems to be destructive
81 lines
2.7 KiB
Python
81 lines
2.7 KiB
Python
from surf.geometry import Vertex, Polygon
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def refine(poly):
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'''
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For each face, add a face vertex
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Set each face vertex to be the centroid of all original vertices for
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the respective face.
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For each edge, add an edge vertex.
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Set each edge vertex to be the average of the two neighbouring face
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vertices and its two original endvertices.
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For each face vertex, add an edge for every edge of the face, connecting
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the face vertex to each edge vertex for the face.
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For each original vertex P, take the average F of all n face vertices for
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faces touching P, and take the average R of all n edge midvertices for
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edges touching P, where each edge midvertex is the average of its two
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endvertex vertices. Move each original vertex to the vertex
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'''
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# each face knows how to subdivide and create a set of subfaces, including
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# interior edges and setup their references correctly... <- not completely
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# finished...
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p = Polygon()
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edges = []
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vertices = []
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faces = []
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for face in poly.faces:
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for subFace in face.sub_faces:
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faces.append(subFace)
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for edge in subFace.edges:
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edges.append(edge)
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for vertex in edge.vertices:
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vertices.append(vertex)
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newVertices = []
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for vertex in poly.vertices:
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face_vertices = []
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edge_mid_points = []
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for edge in vertex.edges:
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edge_mid_points.append(edge.mid_point)
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for face in edge.faces:
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face_vertices.append(face.centroid)
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f = sum(list(
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set(face_vertices)), Vertex()) / len(list(set(face_vertices)))
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r = sum(list(
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set(edge_mid_points)), Vertex()) / len(list(set(edge_mid_points)))
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p = vertex
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n = len(vertex.edges)
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v = (f + 2.0 * r + (n - 3.0) * p) / n
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newVertices.append(v)
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for vertex, newVertex in zip(poly.vertices, newVertices):
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vertex.x = newVertex.x
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vertex.y = newVertex.y
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vertex.z = newVertex.z
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# so now what.........
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# (F + 2R + (n-3) P) / n
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#
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# F = average of all face vertices touching P
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# R = average of all edge vertices touching P
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# P original point
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# n = number of edges connecting to P
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p.faces = faces
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p.vertices = vertices
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p.edges = edges
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# plotting these in excel seems to show the correct values (at first
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# glace...)
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# so now what.........
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# (F + 2R + (n-3) P) / n
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#
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# F = average of all face vertices touching P
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# R = average of all edge vertices touching P
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# P original point
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# n = face vertices or edge vertices (should be the same number)
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return Polygon(vertices, edges, faces)
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