White patches in rendered images

[pangyyyyy]

🐛 Bugs / Unexpected behaviors

Rendered images contain white/ glitchy patches at lower image resolutions.

Instructions To Reproduce the Issue:

I generated renderings for ShapeNet .obj models following fit_textured_mesh tutorial and realised that many of my rendered images contain artifacts (see pic1) - white random patches.

This is the mesh obj viewed in Meshlab.

This problem persist after changing different camera settings and camera type.

This was the original setting:

raster_settings = RasterizationSettings(
    image_size=128,  
    blur_radius=0.0, 
    faces_per_pixel=1, 
    perspective_correct=False
)

The only "fix" I found was to increase the image_size parameter from 128 to >400 for this particular model (pic3 is the output after changing the resolution).

I was wondering if there is an explanation for why these glitchy patches occur? and if there's a way to render images normally at low resolutions?

[bottler]

I think this might be happening because of an overflow in statically allocated bins in the coarse-to-fine rasterization; it's a known phenomenon. The explanation would be the same as #348. You can try to fix it by setting max_faces_per_bin in the RasterizationSettings to something large - e.g. something nearly as large as the number of faces in the mesh. Alternatively you can use the naive rasterizer, by adding bin_size=0 to the RasterizationSettings, but that is likely to be slower.

[pangyyyyy]

The explanation in the provided link #348 was really helpful and thank you so much for swiftly providing a solution!!- changing the max_faces_per_bin works for me