<p>有几个问题:</p>
<ol>
<li><code>mesh.request_face_colors()</code>是<code>TriMesh</code>对象支持存储面部颜色所必需的</李>
<li><code>mesh.set_color</code>需要一个alpha通道,因此您的颜色实际上是<code>[0.67578125, 0.296875, 0.3515625, 1.]</code></li>
<li><code>write_mesh</code>需要<code>face_color=True</code>参数</李>
<li>.obj文件格式不支持顶点/面颜色。颜色保存在单独的.mtl文件(“材质”)中。您可以使用其他格式,例如.ply</李>
</ol>
<p>完整代码:</p>
<pre><code>import openmesh as om
mesh = om.TriMesh()
# add a a couple of vertices to the mesh
vh0 = mesh.add_vertex([0, 1, 0])
vh1 = mesh.add_vertex([1, 0, 0])
vh2 = mesh.add_vertex([2, 1, 0])
vh3 = mesh.add_vertex([0,-1, 0])
vh4 = mesh.add_vertex([2,-1, 0])
# add a couple of faces to the mesh
fh0 = mesh.add_face(vh0, vh1, vh2)
fh1 = mesh.add_face(vh1, vh3, vh4)
fh2 = mesh.add_face(vh0, vh3, vh1)
# add another face to the mesh, this time using a list
vh_list = [vh2, vh1, vh4]
fh3 = mesh.add_face(vh_list)
# 0 ==== 2
# |\ 0 /|
# | \ / |
# |2 1 3|
# | / \ |
# |/ 1 \|
# 3 ==== 4
mesh.request_face_colors()
for face in mesh.faces():
mesh.set_color(face, [0.67578125, 0.296875, 0.3515625, 1.])
for face in mesh.faces():
print(mesh.color(face))
om.write_mesh('test.obj', mesh, face_color=True)
om.write_mesh('test.ply', mesh, face_color=True)
</code></pre>
<p>控制台输出(颜色属性已成功添加到网格):</p>
<pre><code>[0.67578125 0.296875 0.3515625 1. ]
[0.67578125 0.296875 0.3515625 1. ]
[0.67578125 0.296875 0.3515625 1. ]
[0.67578125 0.296875 0.3515625 1. ]
</code></pre>
<p>test.obj的内容:</p>
<pre><code># 5 vertices, 4 faces
mtllib test.mat
v 0.000000 1.000000 0.000000
v 1.000000 0.000000 0.000000
v 2.000000 1.000000 0.000000
v 0.000000 -1.000000 0.000000
v 2.000000 -1.000000 0.000000
usemtl mat0
f 1 2 3
f 2 4 5
f 1 4 2
f 3 2 5
</code></pre>
<p>test.mat的内容(该文件指定test.obj文件中“mat0”的含义):</p>
<pre><code>newmtl mat0
Ka 0.5000 0.5000 0.5000
Kd 0.67451 0.298039 0.352941
illum 1
</code></pre>
<p>test.ply的内容(单个文件中的所有内容):</p>
<pre><code>ply
format ascii 1.0
element vertex 5
property float x
property float y
property float z
element face 4
property list uchar int vertex_indices
property uchar red
property uchar green
property uchar blue
end_header
0 1 0
1 0 0
2 1 0
0 -1 0
2 -1 0
3 0 1 2 172 76 90
3 1 3 4 172 76 90
3 0 3 1 172 76 90
3 2 1 4 172 76 90
</code></pre>