I have a simple flat shape as a poly. I was hoping to use vray dirt (invert normals) to create a edge fade from one texture to the other. So basically the falloff starts at the edge of the element and falls off toward to center of that element. I can’t seem to get this to work with vray dirt and I’m assuming it is because the shapes are entirely flat. Is there another technique to do this or am I doing something wrong ? The entire mesh goes the occluded colour.
This is what I was looking for with a nicer smother falloff:
..and realised that my object was very thin. I discarded the shell mod and instead selected all borders and dragged them down. Now it works as expected.
It would be good to have an option in vray dirt to deal with thin meshes.
okay. I have another problem now. The shape is actually a road that sits on a larger landscape mesh. Now I’m trying to render with this in the scene as well, the vray dirt does not show up at all..even when I have “consider same object only” on. The vray dirt only works when the object is isolated.
I’ve attached a simple example. If you render as is, the small block will not be affected by vray dirt on the top even though I have selected “consider same object only”. If you pull up the small block so it sits further up or even away from the green plane the vray dirt then affects the top as it should. vray_dirt_problem.zip (28.7 KB)
Thank you for bringing this up. Apparently geometry that is placed inside the shaded object influences VRayDirt calculation when invert normal is used. This is a bug and we added it to our system now. We will inform you as soon as it is resolved.
For now you can cut and remove the geometry that lies inside the shaded objects.
enRichPro - enRich your renderings in a second might help you with most of your problems (including thin surfaces). Or you could make a composite of a vrayedgetex and a gradient ramp (box)
We have improved the calculation of VRayDirt with “consider same object only” and “invert normal” enabled. The fix will be included in the next service pack.
