Support for unbounded scenes about kaolin-wisp HOT 1 OPEN

Hi @Salarios77 , agreed that would indeed be a useful thing to have.
We should implement that, but until we do, here is a quick workaround for you, which involves extending the current tracer with one that queries some background model:

1. Add a new forward_bg() function to your neural field (BaseNeuralField subclass). The implementation of this function should accept, i.e., a tensor of rays.

2. Duplicate PackedRFTracer to create a customized version of your own tracer. You can find it here.

3. Remove these lines which delete the rays tensor, as you'll need it soon as input.

4. These lines determine the blending with the background color. Instead of assuming a fixed color (i.e. 1.0 - alpha is assumed to be multiplied with a "white" color here ), query the forward_bg function of your nef instance for a predicted background color.

from kaolin-wisp.