Igneous does the following to make user friendly meshes. It would be good to integrate some of this logic. The output of zmesh.get_mesh is fixed point premultiplied by 2, which is not obvious...
def _create_mesh(self, obj_id):
mesh = self._mesher.get_mesh(
obj_id,
simplification_factor=self.options['simplification_factor'],
max_simplification_error=self.options['max_simplification_error']
)
self._mesher.erase(obj_id)
vertices = self._update_vertices(
np.array(mesh['points'], dtype=np.float32)
)
vertex_index_format = [
np.uint32(len(vertices) / 3), # Number of vertices (3 coordinates)
vertices,
np.array(mesh['faces'], dtype=np.uint32)
]
return b''.join([array.tobytes() for array in vertex_index_format])
def _update_vertices(self, points):
# zi_lib meshing multiplies vertices by 2.0 to avoid working with floats,
# but we need to recover the exact position for display
# Note: points are already multiplied by resolution, but missing the offset
points /= 2.0
resolution = self._volume.resolution
xmin, ymin, zmin = self._bounds.minpt - self.options['low_padding']
points[0::3] = points[0::3] + xmin * resolution.x
points[1::3] = points[1::3] + ymin * resolution.y
points[2::3] = points[2::3] + zmin * resolution.z
return points
Igneous does the following to make user friendly meshes. It would be good to integrate some of this logic. The output of
zmesh.get_meshis fixed point premultiplied by 2, which is not obvious...