Bug report: the sequential render results will jitter with spiral camera path

[chobao]

Hi, I come across the problem when I render sequential images with the following configurations:

• DTU data from official NeuS repository
• use NeuS model trained on neurecon repository
• render 45/90 images with downscale factor as 2
• trajectory is generated by spiral camera path

I find both the generated video and sequential rendered images will jitter with render_view.py. The phenomenon occurs in the whole DTU sequence.
The generated jitter video of dtu_scan63 are as follows:

dtu_scan63_splitval_rgb_600x800_45_spiral.mp4

After checking the code carefully, I find the jitter will disappear when I replace the following code when rendering images:

But I think both of the implementations are correct and check that the angle difference of the 2 implementations is about 1e-3 degrees. So I can not find the exact reason for the problem.

With modification, the results are as follows :

dtu_scan63_splitval_rgb_600x800_45_spiral.mp4

Update:
I find when I set pixel_points_cam, p, as double , the jitter also will disappear