def tessellate(self, tolerance):
tess = Tesselator(self.wrapped)
tess.Compute(compute_edges=True, mesh_quality=tolerance)
vertices = []
indexes = []
# add vertices
for i_vert in range(tess.ObjGetVertexCount()):
xyz = tess.GetVertex(i_vert)
vertices.append(Vector(*xyz))
# add triangles
for i_tr in range(tess.ObjGetTriangleCount()):
indexes.append(tess.GetTriangleIndex(i_tr))
return vertices, indexes
def draw_shape_mpl(shape):
"""
Draw a TopoDS_Shape with matplotlib
"""
tess = Tesselator(shape)
triangles = []
edges = []
# get the triangles
triangle_count = tess.ObjGetTriangleCount()
for i_triangle in range(0, triangle_count):
i1, i2, i3 = tess.GetTriangleIndex(i_triangle)
triangles.append(
[tess.GetVertex(i1),
tess.GetVertex(i2),
tess.GetVertex(i3)])
# get the edges
edge_count = tess.ObjGetEdgeCount()
for i_edge in range(0, edge_count):
vertex_count = tess.ObjEdgeGetVertexCount(i_edge)
edge = []
for i_vertex in range(0, vertex_count):
vertex = tess.GetEdgeVertex(i_edge, i_vertex)
edge.append(vertex)
edges.append(edge)
# plot it
fig = plt.figure()
ax = Axes3D(fig)
ax.add_collection3d(Poly3DCollection(triangles, linewidths=0.2, alpha=0.5))
ax.add_collection3d(Line3DCollection(edges, colors='w', linewidths=1.0))
ax.get_xaxis().set_visible(True)
ax.get_yaxis().set_visible(True)
ax.set_autoscale_on(True)
plt.show()
def generate_png(shape):
"""
Draw a TopoDS_Shape with matplotlib
"""
from OCC.Visualization import Tesselator
from mpl_toolkits.mplot3d import Axes3D
from matplotlib import pyplot as plt
from mpl_toolkits.mplot3d.art3d import Poly3DCollection, Line3DCollection
tess = Tesselator(shape)
triangles = []
edges = []
# get the triangles
triangle_count = tess.ObjGetTriangleCount()
for i_triangle in range(0, triangle_count):
i1, i2, i3 = tess.GetTriangleIndex(i_triangle)
triangles.append([tess.GetVertex(i1), tess.GetVertex(i2), tess.GetVertex(i3)])
# get the edges
edge_count = tess.ObjGetEdgeCount()
for i_edge in range(0, edge_count):
vertex_count = tess.ObjEdgeGetVertexCount(i_edge)
edge = []
for i_vertex in range(0, vertex_count):
vertex = tess.GetEdgeVertex(i_edge, i_vertex)
edge.append(vertex)
edges.append(edge)
# plot it
fig_side = plt.figure(figsize=(10, 4))
ax = Axes3D(fig_side)
ax.add_collection3d(Poly3DCollection(triangles, linewidths=0.15, alpha=0.5))
ax.add_collection3d(Line3DCollection(edges, colors='w', linewidths=1.0))
ax.set_axis_off()
ax.set_xlim(-1800, 1800)
ax.set_ylim(-800, 800)
ax.set_zlim(-800, 800)
ax.view_init(elev=-1., azim=90)
fig_side.savefig("views/side.png")
fig_top = plt.figure(figsize=(5, 4))
ax_top = Axes3D(fig_top)
ax_top.add_collection3d(Poly3DCollection(triangles, linewidths=0.15, alpha=0.5))
ax_top.add_collection3d(Line3DCollection(edges, colors='w', linewidths=1.0))
ax_top.set_axis_off()
ax_top.set_xlim(-2500, 2500)
ax_top.set_ylim(-50, 450)
ax_top.set_zlim(-250, 250)
ax_top.view_init(elev=-1., azim=-2)
fig_top.savefig("views/back.png")
ax_top.set_xlim(-2500, 2500)
ax_top.set_ylim(-50, 450)
ax_top.set_zlim(-200, 300)
ax_top.view_init(elev=-1., azim=182)
fig_top.savefig("views/front.png")