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save all mesh coordinates as mm-ints to avoid floating point errors

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This commit is contained in:
Laura Klünder 2017-11-14 02:49:02 +01:00
parent dd8d160a10
commit 73f27300ca
5 changed files with 54 additions and 46 deletions
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9
src/c3nav/mapdata/utils/mesh.py
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@ -16,10 +16,13 @@ def get_face_indizes(start, length):
def triangulate_rings(rings, holes=None):
rings = tuple(tuple(tuple(vertex) for vertex in (np.array(ring.coords)*1000).astype(np.uint64)) for ring in rings)
rings = tuple(
tuple(tuple(vertex) for vertex in np.rint(np.array(ring.coords)*1000).astype(np.int32))
for ring in rings
)
if not rings:
return np.empty((0, 2), dtype=np.float32), np.empty((0, 3), dtype=np.int32)
return np.empty((0, 2), dtype=np.int32), np.empty((0, 3), dtype=np.uint32)
vertices = tuple(set(chain(*rings)))
vertices_lookup = {vertex: i for i, vertex in enumerate(vertices)}
@ -38,7 +41,7 @@ def triangulate_rings(rings, holes=None):
info.set_holes(holes)
mesh = triangle.build(info, quality_meshing=False)
return np.array(mesh.points)/1000, np.array(mesh.elements)
return np.rint(np.array(mesh.points)).astype(np.int32), np.array(mesh.elements, dtype=np.uint32)
def _triangulate_polygon(polygon: Polygon, keep_holes=False):