Bug 10. Vray 1.47.03. AA sampling background

[HCafe]

If i use AA1 - 4 subdiv per pixel or use AA3 +1+3 vray generate samples for empty background. And render empty background very very slow. Whay does vray use AA for background?

[vlado]

Because there cases where it would be good to super-sample the background too (f.e. when you have DOF, or motion blur plus camera movement, or when the background is a procedural map that has sharp edges).

If you want to speed things up, render with black background, and composite it later.

Best regards,
Vlado

[HCafe]

My background is color - 0,0,255...whitout dof,mb,maps...
If i render whit AA2+1+4 all ok ...vray use unly one sample per pixel
If i use AA1 +4 vray use 4 pixel per pixel..and clear background render TWO minutes (1280pixel per height)...

[Morbid Angel]

And as I posted before and other people too, vray has this hard time with antialiasing empty black or whatever other color, without use of dof and etc. I get black frames now which antialiase for 15 min per frame on dual xeons..its redicules.

[HCafe]

Vlado can you exlude background from AA? I see its very easy decision.

[vlado]

Vlado can you exlude background from AA? I see its very easy decision.

It's not easy to implement though. For now, it will have to stay this way, at least until after VRay 1.5 is out. You can add it to the wishlist though.

Best regards,
Vlado

[Morbid Angel]

vlado, what about including some kind of bitmap region rendering...like in maxwell or brazil? the idea is to render alpha map (sequence) then apply it to this bitmap region and then render your anim, so vray would skip areas where its black?