Using multiple textures in OpenGL?

Congrats on your Collada parser; that's a complex task for sure; there are third-party tools you can use that do that for you, but I'm sure it was good practice and learning to do it yourself.

There is no good way to switch textures in the middle of rendering. What you need to do is separate the meshes by texture (material), draw them separately and switch the texture (and possibly uniform values for the material) between draw calls with glBindTexture(GL_TEXTURE_2D, id).

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