Black buckets with Brute Force and Adaptive DMC (and render to texture)

[Swahn_Kung]

I have been trying to render out a texture of a global illumination lighting a sphere, but there seem to be random buckets turning out black for some reason.





I'm not rendering the texture using Distributed Rendering, but I've seen these "missing buckets" turning up when rendering final images with Brute Force before actually.
It seems like the edges of the light is where these missing buckets show up, as if they consider there is no need to render them.

I suspect these missing buckets is a "feature" of the Adaptive DMC because rendering with Fixed image sampler show no missing buckets at all, even with Distributed Rendering.
Adaptive DMC is faster, but I cannot figure out how to make it put sampels at the edges too. Seems like there is a threshold value somewhere that the information in these missing buckets are below to be included in the render.

Any thoughts?

[Swahn_Kung]

Well, perhaps I should turn down the DMC Adaptiveness below 1.0 to get more buckets to render...
Haven't tried it but should solve things I guess.

I guess I need to reduce the max amount of samples so that I won't get too long render times.

[bigbossfr]

Hi,
Set your min AA DMC to 2.

[joconnell]

Well, perhaps I should turn down the DMC Adaptiveness below 1.0 to get more buckets to render...
Haven't tried it but should solve things I guess.

I guess I need to reduce the max amount of samples so that I won't get too long render times.

BigBossFr is right.

Vlado mentioned in a couple of his posts that he doesn't recommend using adaptiveness of 1.0 any more as there's a good chance vray won't get enough samples first to make good decisions on further adaptive sampling - try dropping it to 0.9 and see if that helps.

[vlado]

Setting the min. subdivs for the adaptive DMC image sampler to 2 should also help, as bigbossfr suggested.

Best regards,
Vlado

[Swahn_Kung]

That solved it! You are a rock Vlado! bigbossfr too!

Setting the min. subdivs for the adaptive DMC image sampler to 2 should also help, as bigbossfr suggested.

Best regards,
Vlado