weird moire pattern when training instant-ngp without scene contraction

[hoanhle]

Describe the bug Whenever i trained instant-ngp without scene contraction i often get weird moire pattern on the render view (in both accumulation) and (rgb)

To Reproduce Train instant-ngp without scene contraction on bounded dataset.

Expected behavior

[hoanhle]

related issue: https://github.com/nerfstudio-project/nerfstudio/issues/1827