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Add auto_scaling parameter for scaling the mesh inside the unit sphere #39

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Add auto_scaling parameter for scaling the mesh inside the unit sphere #39

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373ac11
Add fixed_scaling to keep the object ratios fixed in the unit_sphere
maurock Dec 5, 2022
9a7cf0d
Add auto_scaling parameter for scaling the mesh inside the unit sphere
maurock Dec 5, 2022
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4 changes: 2 additions & 2 deletions mesh_to_sdf/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -49,8 +49,8 @@ def mesh_to_voxels(mesh, voxel_resolution=64, surface_point_method='scan', sign_
return surface_point_cloud.get_voxels(voxel_resolution, sign_method=='depth', normal_sample_count, pad, check_result, return_gradients)

# Sample some uniform points and some normally distributed around the surface as proposed in the DeepSDF paper
def sample_sdf_near_surface(mesh, number_of_points = 500000, surface_point_method='scan', sign_method='normal', scan_count=100, scan_resolution=400, sample_point_count=10000000, normal_sample_count=11, min_size=0, return_gradients=False):
mesh = scale_to_unit_sphere(mesh)
def sample_sdf_near_surface(mesh, number_of_points = 500000, surface_point_method='scan', sign_method='normal', scan_count=100, scan_resolution=400, sample_point_count=10000000, normal_sample_count=11, min_size=0, return_gradients=False, auto_scaling=True, scale_ratio=1):
mesh = scale_to_unit_sphere(mesh, auto_scaling, scale_ratio)

if surface_point_method == 'sample' and sign_method == 'depth':
print("Incompatible methods for sampling points and determining sign, using sign_method='normal' instead.")
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9 changes: 6 additions & 3 deletions mesh_to_sdf/utils.py
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Expand Up @@ -2,13 +2,16 @@
import trimesh
import numpy as np

def scale_to_unit_sphere(mesh):
def scale_to_unit_sphere(mesh, auto_scaling, scale_ratio):
if isinstance(mesh, trimesh.Scene):
mesh = mesh.dump().sum()

vertices = mesh.vertices - mesh.bounding_box.centroid
distances = np.linalg.norm(vertices, axis=1)
vertices /= np.max(distances)
if auto_scaling:
distances = np.linalg.norm(vertices, axis=1)
vertices /= np.max(distances)
else:
vertices /= scale_ratio # ratio between the original mesh and the scaled mesh inside the unit sphere

return trimesh.Trimesh(vertices=vertices, faces=mesh.faces)

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