Undersampling on matte shadows with ADMC

[Paul Oblomov]

Maybe not a bug, just me . . . Using latest sp1 + max9 x64.
Adaptive dmc 1/4 and everything else is default, except rised subdivs - 22.
The problem is - when I check matte and shadows on vrayplane it start to look like second pic. No gi, just dome light + direct with area shadows and vraylight (sphere).



Any ideas ?
P.S. When I set adaptive dmc to 2/4 or higher - noise starts to wanish. And when I turn any other AA engine - everything is good.

[vlado]

Do you have the "Affect alpha" option turned on for your matte object? If not, try turning it on and see what happens.

Best regards,
Vlado

[Paul Oblomov]

Yes. It helped.
But why does this happen ?

[vlado]

There is a bug, which is fixed already, but it basically causes the image sampler to not see the background through the matte object, so to the image sampler, the background looks perfectly black and it does not see a reason to do any super-sampling. When you check the "Affect alpha" option, the alpha is seen by the image sampler and it can handle this properly.

Best regards,
Vlado

[Paul Oblomov]

Oh. Yes. I've read already about this. Thought it won't bother me

Vlado - got another issue with another scene:
I draw a rectangle around place I want vray to render, but instead of rendering this rectangle, it renders some another at any part of the screen!

Maybe this is a memory related stuff, as I home I'm still 2gb limited and my scene eats slightly above 2gb. And this happens only in max vfb, as vray vfb just doesn't change at all. It stays blank...
Maybe it's not vray related, but I see this for the first time. RCx was free of it.

[vlado]

What kind of rendering are you doing (region/crop/blowup)? Do you have the V-Ray VFB to take the resoluton from 3ds Max or you have overridden it?

Best regards,
Vlado

[Paul Oblomov]

I even restarted max and still - max vfb and vray vfb doesn't render that region.
At vray vfb I set resolution manually. I'm doing region render. Mouse tracking works fine... But that's not what I want.

[vlado]

Not sure what might be causing it then, without the scene.

One thing you can try is to set the 3ds Max resolution to be the same as the VFB one.

The other thing is to directly specify the rendering region from MaxScript as described here: http://www.spot3d.com/vray/help/150S...ex.html#hidden

Best regards,
Vlado

[Paul Oblomov]

Here's da scene. Only camera But it still gives me this glitch.

[Paul Oblomov]

So ? Any ideas ?

[Paul Oblomov]

bumpy bump

scene is on previous page.

[dlparisi]

Do you know your camera was locked in the render scene dialog box? Unchecking this makes ever region render work as expected.

[Paul Oblomov]

I'm stupid. Thank you