Black buckets in Motion Blur and DOF

[RichardBlank]

This is a problem I've noticed. Some of the buckets get black in the motion blur and dof parts.
Could it be that I've used to small buckets?

[vlado]

It happens because none of the initial rays within the bucket hit any object. To improve this, you can:
1) increase the bucket size;
2) increase the min. subdivs for the Adaptive DMC image sampler.

The effect of these would be to increase the probability that some ray in the bucket hits an object, so that the rest of the bucket can be supersampled properly.

Best regards,
Vlado

[RichardBlank]

Ok. Thanks for the pointer!

[shadevfx]

could this also contribute to the cause of super white squares as well?

[vlado]

could this also contribute to the cause of super white squares as well?

I don't think so... which white squares?

Best regards,
Vlado

[shadevfx]

We have a pretty consistent problem of overbright (almost infinitely bright) white squares that appear in lots of renders. doesnt seem to have a rhyme or reason...

Usually on glossy reflective surfaces

[vlado]

Ah, ok. They usually happen when a ray hits something very bright. This might be the sun, or another light source (or a glossy reflection or a light source). In the case of the sun, it might help to enable its "Invisible" option (also in any VRaySky textures that use a manual sun node). Enabling the "sub-pixel mapping" and "clamp output" options for color mapping might also help.

Best regards,
Vlado