Optimize Number of Nodes

A reduced number of nodes lead to fewer node-related render state activations that have to be processed. Thus, whenever geometry can be safely combined to a single node like e.g. a mesh, then this way should be favoured. For instance a tire and a rim form a logical group sharing the same transformation. In that case the designer can unify separate geometries in a single mesh with the aid of a digital content creation (DCC) tool. Consequently, the rim and tire do their texture lookup in a single texture, which further leverages performance gains by texture caching. 
 
   
 
 
 
 
 
 See below crucial prerequisites for combining Nodes: 
 
 
 
 
 Nodes share same transformation (position, rotation, scale). 
 Nodes share the same Appearance (textures, shaders, material, render-mode, render-order) 
 Nodes are within the same render-order bin.