In Babylon.js, the scene graph hierarchy is a tree-like structure that organizes 3D objects and their relationships. It consists of nodes representing entities like cameras, lights, meshes, and materials. The root node is the Scene object, which contains all other nodes.
The hierarchy affects rendering in several ways :1. Parent-child relationships : Transformations applied to parent nodes affect child nodes, enabling complex animations and interactions.
2. Culling : Nodes outside camera view or behind occluders are not rendered, improving performance.
3. Sorting : Transparent objects are sorted back-to-front for correct blending.
4. Shader management : Materials and shaders are shared among similar objects, reducing GPU overhead.
5. Light assignment : Lights only affect nearby objects, optimizing calculations.
6. Picking : Raycasting considers hierarchical bounding volumes for efficient hit testing.
Understanding the scene graph hierarchy helps optimize rendering by organizing assets efficiently and leveraging built-in optimizations.
