http://blog.csdn.net/leonwei/article/details/39233747
found that the U3D model package may have a bug that causes the model Normals to be released to the phone to be lost (some materials become full black or full white, the editor is normal), the method is identified and tested to solve this problem:
1. For models that have vertex color in max (or use a shader that requires vertex color participation), do not import the material at the same time when you import the model, make the preset and then specify the material, i.e.
Don't tick here.
2. For those models that do not have a vertex color, if the imported material is selected here, make sure to upload the corresponding generated material
3. The most safe way to do this is to import the model without importing the material, but to make the preset and then specify the material
A problem with the Unity packaging model
