AA sample overrides?

[gardeler]

I'm playing around with a shave and a haircut scene. (a mouse) Seems to me that the fur itself is rendering fine in this shot. (the full height of the mouse is about 1/3 of the frame.) But the whiskers that are geometry based is having some AA troubles. That is of course because they are so small and thin at that distance.
Right now I'm using adaptive DMC with 2-10 with 0.005 threshold. This is of course sending the rendertimes through the roof. (and it is still flickering a bit!) Upping it to 3-10 might do the trick but I was hoping for a more elegant solution.

My question is: Is there some sort of attribute I can add to increase samples for that object only so it does not slow down the whole scene? I have heard that it is difficult for ray tracers to handle a per object AA sample override? But any help to get the whisker to stop flickering would be great. (and I would like not to split everything up and render everything twice..)

I'm running SP1 on win 64.

Thanks

Marre

[vlado]

A work-around might be to make the whiskers thicker and change their opacity to make them appear thinner. The logic behind this is that, for lines thinner than one pixel, the only observable effect of the line thickness is to make the pixel less or more transparent.

Even if we had per-obejct AA settings, this would still not work - if V-Ray does not hit the geometry at all, it would have no way of knowing how many samples to use.

Best regards,
Vlado

[jacksc02]

What AA filtering are you using?

[gardeler]

A work-around might be to make the whiskers thicker and change their opacity to make them appear thinner. The logic behind this is that, for lines thinner than one pixel, the only observable effect of the line thickness is to make the pixel less or more transparent.

Even if we had per-obejct AA settings, this would still not work - if V-Ray does not hit the geometry at all, it would have no way of knowing how many samples to use.

Best regards,
Vlado

@Vlado: Thanks, I'll try the work around next time, but this is an old renderman project so it has t match the look of the previous movies.
Is it possible to do a "boundingbox flag"? so that if a ray hits the bounding box of the object, it will up the samples within that box. Or some other guidance for the renderer to where to increase samples. (but I assume it is not do-able as it probably would exist in a render by now...

@Chris
I'm using adaptive DMC with 2-10 with 0.005 threshold.

Thank you

Martin