Adding documentation and testing for mesh texture coordinate encoding (…

…#43)

* Add tex_coord lines to a comment.

* Add tex_coord testing.

src/DracoPy.pyx

@@ -151,6 +151,8 @@ def encode(
         order as the input.
     Colors is a numpy array of colors (uint8) with shape (N, K). N is the number of
         vertices. K must be >= 1. Use None if mesh does not have colors
+    Tex coord is a numpy array of texture coordinates (float) with shape (N, 2). N is the number of
+        vertices. Use None if mesh does not have texture coordinates.
     """
     assert 0 <= compression_level <= 10, "Compression level must be in range [0, 10]"
 
@@ -193,7 +195,7 @@ def encode(
 
     tex_coord_channel = 0
     if tex_coord is not None:
-        assert np.issubdtype(tex_coord.dtype, np.float), "Tex coord must be float"
+        assert np.issubdtype(tex_coord.dtype, float), "Tex coord must be float"
         assert len(tex_coord.shape) == 2, "Tex coord must be 2D"
         tex_coord_channel = tex_coord.shape[1]
         assert 1 <= tex_coord_channel <= 127, "Number of tex coord channels must be in range [1, 127]"

tests.py

@@ -42,6 +42,7 @@ def test_decoding_and_encoding_mesh_file():
     assert mesh_decode.colors is None, "colors should not present"
 
     colors = np.random.randint(0, 255, [mesh.points.shape[0], 16]).astype(np.uint8)
+    tex_coord = np.random.random([mesh.points.shape[0], 2])
 
     # test extreme quantization
     encoding_test4 = DracoPy.encode(mesh.points, mesh.faces, compression_level=10,
@@ -52,9 +53,10 @@ def test_decoding_and_encoding_mesh_file():
 
     # Setting quantization_bits 26 here. Larger value causes MemoryError on 32bit systems.
     encoding_test5 = DracoPy.encode(mesh.points, mesh.faces, compression_level=1,
-                                    quantization_bits=26, colors=colors)
+                                    quantization_bits=26, colors=colors, tex_coord=tex_coord)
     mesh_decode = DracoPy.decode(encoding_test5)
     assert mesh_decode.colors is not None, "colors should present"
+    assert mesh_decode.tex_coord is not None, "tex_coord should present"
 
     with open(os.path.join(testdata_directory, "bunny_test.drc"), "wb") as test_file:
         test_file.write(encoding_test)