> so why does it use multi-layer perceptron? is it the same as ANN? why not calling it ANN? Does it have activation? According to Wikipedia, "A multilayer perc

> so why does it use multi-layer perceptron? is it the same as ANN? why not calling it ANN? Does it have activation? According to Wikipedia, "A multilayer perceptron (MLP) is a class of feedforward artificial neural network (ANN)." We're being more specific about what we use :) > There is another thing I don't understand. Traditional volume data is a map of position to density (or color). There doesn't seem to be the need for a direction as an input. Why does the network need a direction? Why can't we get a density and a color given a position? Volume data of this form is unable to express the idea of view-dependent reflections. I admit, we don't make much use of that here, but it does help! See NeRF for where it makes a big, big difference: https://www.matthewtancik.com/nerf https://www.matthewtancik.com/nerf