add data processing code

data_processing/norm_and_sample_mesh.py

@@ -0,0 +1,42 @@
+import trimesh
+import os
+import numpy as np
+
+def load_mesh(file_in):
+    mesh = trimesh.load(file_in, force='mesh', skip_materials=True, maintain_order=True, process=False)
+    return mesh
+
+def normalize_mesh(file_in, file_out):
+
+    mesh = load_mesh(file_in)
+
+    bounds = mesh.extents
+    if bounds.min() == 0.0:
+        return
+    # translate to origin
+    translation = (mesh.bounds[0] + mesh.bounds[1]) * 0.5
+    translation = trimesh.transformations.translation_matrix(direction=-translation)
+    mesh.apply_transform(translation)
+
+    scale = 1.0 / mesh.scale
+    scale_trafo = trimesh.transformations.scale_matrix(factor=scale)
+    mesh.apply_transform(scale_trafo)
+
+    mesh.export(file_out, include_texture=False)
+
+
+def sample_point_cloud(path_mesh, n_pts):
+
+    mesh = load_mesh(path_mesh)
+    pts = mesh.sample(n_pts)
+
+    return np.array(pts)
+
+if __name__ == '__main__':
+
+    path_src = f'mesh.obj'
+    path_dst = f'mesh_normalized.obj'
+    normalize_mesh(path_src, path_dst)
+
+    point_cloud = sample_point_cloud(path_dst, n_pts=2048)
+    np.save('point_cloud.npy', point_cloud)