Sara Fridovich-Keil

Let's focus on a single ray. Then `offset_pos` is the distance along the ray at which the ray crosses the planes defined by the positive-coordinate faces of the grid cube,...

1. Yes, the origin is the center of the grid. 2. Generally no. The two versions compute the same rendering formula, but the implementations are quite different. 3. This is...

Are you using https://github.com/sxyu/svox2/blob/master/opt/configs/tnt.json ?

Maybe you are using a config that is intended for bounded scenes? From the video it looks like the model is trying to squeeze everything into the foreground, which it...

Thanks for sharing your work! Indeed there are many related fields with similar problems and approaches. As another example, SHDOM (https://coloradolinux.com/shdom/) is a similar method to Plenoxels that is used...

Yes, these should be the spherical harmonic coefficients. To decode them into RGB you'll need to choose a view direction and evaluate the spherical harmonics of degree 2 (https://github.com/sxyu/svox2/blob/master/svox2/utils.py#L115), which...

Yes, the view direction is just the normalized ray direction (you can see an example here: https://github.com/sxyu/svox2/blob/master/svox2/svox2.py#L663). I'm not sure what you mean by "the number of nonzero sh_coefficients" or...

I'm not sure exactly what you are doing, but if you are directly loading the pretrained sh coefficients then there should be one set of coefficients for each occupied voxel...

Oh I see, if you want a 3D RGB grid then you will not be able to handle view-dependent color. But in that case you can just pick a random...

There's no reason to expect MxN to equal K. Each ray will pass through multiple voxels, some voxels may have multiple rays pass through them, and some voxels may not...