I have just readed this tutorial about load a 3D model file: http://www.lighthouse3d.com/cg-topics/code-samples/importing-3d-models-with-assimp/#comment-14551. Its render routine uses a recursive_render function to scan all node.

My question:

1. What is a aiNode struct store?

2. What different form this method and above method:

   for (int i=0; imNumMesh; ++i) { draw scene->mMeshes[i]; }

Thanks for reading!