displacement fall off

[posterus]

in order to help render times, how about some displacement settings that let you specify a falloff for the displacement effect. for objects far away the displacement effect is not really necessary but it still adds to the render time.
maybe it could let the user specify a range for the full displacement effect...say a radius of 0-25' from the camera. then a falloff range of 25'-X'...i guess something similar to the hotspot/falloff of a direct light.
-joe

[mike_kennedy]

you could do this with a fall off shader with a distance setting to a degree, and using 2d displacement with the vray displace mod helps and is pretty fast... but it would be nice

[vlado]

You can try to use the Falloff map in distance mode in combination with 3d displacement.

Best regards,
Vlado

[duke2]

It would still subdivide it unnecessarily in the distance though wouldn't it?

[vlado]

Nope, V-Ray will not subdivide regions which are flat (i.e. where the displacement value is constant across a triangle).

Best regards,
Vlado

[duke2]

You can try to use the Falloff map in distance mode in combination with 3d displacement.

Best regards,
Vlado

That's pretty cool. You could actually do fake frustrum culling aswell by masking out your displacement with both this distance-to-camera falloff, and a black and white camera mapped image so that anything out of camera view is black, and therefore no displacement, and therefore no subdivision. Would need some playing about with though!