The problem of opacity mapping and a strange workaround

V-Ray V-Ray for Rhino General
1

Since a long time I have the problem, that transparent areas of offset surfaces are not rendered 100% clear. Here an example:

Screen Shot 10-21-21 at 02.51 PM 001.JPG
Screen Shot 10-21-21 at 02.51 PM 001.JPG240×267 17.9 KB

So far I remember me the problem it’s a GPU rendering issue. Will be there a fix, maybe per next update?

For now I found a wild workaround per displacement and water level. The water level fully cut the wanted transparent area away, the unwanted shadow effect is gone. :slight_smile:

Screen Shot 10-21-21 at 02.55 PM.JPG
Screen Shot 10-21-21 at 02.55 PM.JPG703×297 48.7 KB

2

Hello Micha,

Try to flip the normal with the Dir command to see if it makes any difference. If this does not work, please send an example for investigation.

3

Hi Slavcho,

here an example. In GPU mode I get something like a shadow and in CPU mode the surface behind the mapped surface get transparent.

-Micha

Screen Shot 10-29-21 at 03.33 PM.JPG
Screen Shot 10-29-21 at 03.33 PM.JPG765×436 23.2 KB

Transparency-Shadow.zip (624 KB)