Black pixels / dots / holes / artifacts in renders ?

[Anonymous]

Hello, i have strange black pixels / dots / holes / artifacts in my renders, it happens randomly on the rendered sequence.

Scene specs :

- Mtoa 3.1.1.1 and Maya 2017 update 4

- animated camera and animated objects with geometry cache

- lighting with a skydome light and an hdr image

- Samples : 6,4,4,2 ( tested with 8,4,4,2 also)

- i tested changing the hdr image but i still have dots at the same positions

- i tested lock/unlock sampling paterns, adaptive sampling on/off, increasing diffuse/spec samples but i still have black dots / spots / pixels randomly on some images

- i tested decreasing the filter width, it reduces the spots size but the render looks noisyer

- i tested with locked camera also

- spots seams to appear on the indirects AOVs only

- spots are not affecting Alpha channel

i realy have no clue on what is happening.

Can you please help? 🙂

Thanks

Have a good day

Soal

[Anonymous]

So the problem was the indirect rays comming from my ground geo with an aiStandardSurface and a projected texture on it. It seams the texture had weird pixel values, so i just added a clamp node after the file texture node and it fixed the problem.

Thanks

Soal