Module tiny_nerf 

Compact 4-layer NeRF for tests and fast experiments.

Architecture: input → FC → ReLU → FC → ReLU → FC → ReLU → FC → (sigma, RGB) Last layer: no activation for sigma (then ReLU); Sigmoid for RGB.

Structs

TinyNerf

Tiny NeRF MLP: 3 hidden layers + output layer.