在 SceneKit 中导入带有纹理的 .obj 文件

Question

I'm trying to render a 3D model .obj file downloaded from the web but I'm having issues with applying the textures to the model. .mlt, .obj and texture .jpg files are all in the same folder (eg car.obj, car.mtl, car.jpg, carDark.jpg).

Are the textures supposed to be applied automatically by Model I/O? How am I supposed to use Model I/O to import textures?

Answer 1

Did you check the file path to the .mtl file in the .obj file? If this path is incorrect then the materials will not load. OBJ and MTL files are text files so you can use a text editor to open them. The path to the .mtl file should be at the top of the .obj file:

mtllib mymtlfile.mtl

If they are in the same folder you can just strip the path.

If this path is okay then you should check the paths to the textures in the .mtl file. Look for lines starting with map_ . For instance:

map_Kd mydiffusetexture.png
map_Ka /path/to/myambienttexture.tga
map_bump mybumptexture.jpg

If you strip all the paths then the file import should work.

Answer 2

Add your textures images files in art.scnassets

Select your scene and select your textures in Material properties