kiui

@RainbowRui Sorry that I don't have a 30 series card to reproduce this... Since the code is heavily based on TensoRF, could you reproduce TensoRF in 3090?

@AIBluefisher Sorry that the depth backward in cuda ray mode has not been implemented. You may need to modify [this function](https://github.com/ashawkey/torch-ngp/blob/main/raymarching/raymarching.py#L238) and properly handle the grad_depth.

@2j1ejyu Hi, these two behaviours in fact follow instant-ngp. In some early experiments I don't find these will cause significant performance degradation. You can modify them and try!

@nerfology Hi, the current density grid for d-nerf is simply a `[T, H^3]` boolean array, dividing the time into `T` intervals. For any time `t`, we choose the grid `[H^3]`...

you can find the `T` here: https://github.com/ashawkey/torch-ngp/blob/6d5016f34ca9465180dcde68368a62c3294c065f/dnerf/renderer.py#L74

@mah-asd Hi, do you mean `composite_rays_train` or `composite_rays` (for inference)? In fact both depth and image should have `None` for `.grad`, since they are not leaf nodes. Only tensor with...

@nogu-atsu Hi, I think this is caused by a default setting of ['force_all_rays = False'](https://github.com/ashawkey/torch-ngp/blob/main/dnerf/utils.py#L81) in training, which may ignore some rays for acceleration (it triggers [this](https://github.com/ashawkey/torch-ngp/blob/main/raymarching/src/raymarching.cu#L416)). You should change...

@nogu-atsu Oh I got it wrong. The real reason maybe the race condition between the two atomicAdds, e.g., ```bash [thread1] get point_index = 0, num_steps = 10 [thread2] get point_index...

@kwea123 I remember that I wanted to imitate what instant-ngp does around [here](https://github.com/NVlabs/instant-ngp/blob/master/src/testbed_nerf.cu#L3062). Since the total samples from all rays are usually much less than the max samples (n_rays *...

@kwea123 In fact the zero RGB of the last ray is intended if I understand correctly, which is also in the [ray march training code](https://github.com/NVlabs/instant-ngp/blob/master/src/testbed_nerf.cu#L1199) of instant-ngp. This ray (and...