added per_corner_normals

Author: Teseo Schneider

src/per_corner_normals.cpp

@@ -0,0 +1,48 @@
+#include <common.h>
+#include <npe.h>
+#include <typedefs.h>
+#include <igl/per_corner_normals.h>
+
+const char *ds_per_corner_normals = R"igl_Qu8mg5v7(
+
+Compute vertex normals via vertex position list, face list
+
+Parameters
+----------
+V  #V by 3 eigen Matrix of mesh vertex 3D positions
+F  #F by 3 eigen Matrix of face (triangle) indices
+corner_threshold  threshold in degrees on sharp angles
+
+Returns
+-------
+CN  #F*3 by 3 eigen Matrix of mesh vertex 3D normals, where the normal for corner F(i,j) is at CN(i*3+j,:)
+
+See also
+--------
+
+
+Notes
+-----
+None
+
+Examples
+--------
+
+)igl_Qu8mg5v7";
+
+npe_function(per_corner_normals)
+npe_doc(ds_per_corner_normals)
+
+npe_arg(v, dense_float, dense_double)
+npe_arg(f, dense_int, dense_long, dense_longlong)
+npe_arg(corner_threshold, double)
+
+
+npe_begin_code()
+  assert_valid_3d_tri_mesh(v, f);
+  EigenDenseLike<npe_Matrix_v> n;
+  igl::per_corner_normals(v, f, corner_threshold, n);
+  return npe::move(n);
+
+npe_end_code()
+

tests/test_basic.py

@@ -711,6 +711,12 @@ def test_per_vertex_normals(self):
         self.assertEqual(n.dtype, self.v1.dtype)
         self.assertTrue(n.flags.c_contiguous)
 
+    def test_per_corner_normals(self):
+        n = igl.per_corner_normals(self.v1, self.f1, 80)
+        self.assertEqual(n.shape, (self.f1.shape[0]*3, 3))
+        self.assertEqual(n.dtype, self.v1.dtype)
+        self.assertTrue(n.flags.c_contiguous)
+
     def test_per_vertex_attribute_smoothing(self):
         aout = igl.per_vertex_attribute_smoothing(self.v1, self.f1)
         self.assertEqual(aout.shape, self.v1.shape)