PDA

View Full Version : 32-bit displacements?



akademus
09-11-2011, 07:37 AM
Does LW support 32-bit displacements?

jasonwestmas
09-11-2011, 09:47 AM
I'm not sure because I doubt I was ever able to generate enough polygons to support that level of detail without maxing out my ram. I'd have to more fully investigate it, I only tried it once and got some strange results. A 32-bit displacement map from Zbrush for example looks really different just looking at the map itself.

Chrusion
09-12-2011, 10:05 PM
I don't think poly count is really the issue. Many times a low poly count mesh (200 x 200) will "alias" in discreet steps with a 256-level, 8-bit grayscale image, especially when pixel blending for the image map texture is turned off. To prevent the stepped aliasing of a mesh, using a 16- or 32-bit image would give at minimum 256 times more "steps" or resolution and result is a smooth displacement.
.

jasonwestmas
09-13-2011, 08:16 AM
I don't think poly count is really the issue. Many times a low poly count mesh (200 x 200) will "alias" in discreet steps with a 256-level, 8-bit grayscale image, especially when pixel blending for the image map texture is turned off. To prevent the stepped aliasing of a mesh, using a 16- or 32-bit image would give at minimum 256 times more "steps" or resolution and result is a smooth displacement.
.

Very helpful thanks!

TeZzy
09-13-2011, 03:23 PM
Using a 32bit displacement maps means you don't have to mess with the settings, since the depth of the details is built into the map.

jasonwestmas
09-14-2011, 09:25 AM
I don't think poly count is really the issue. Many times a low poly count mesh (200 x 200) will "alias" in discreet steps with a 256-level, 8-bit grayscale image, especially when pixel blending for the image map texture is turned off. To prevent the stepped aliasing of a mesh, using a 16- or 32-bit image would give at minimum 256 times more "steps" or resolution and result is a smooth displacement.
.

So what you are saying is that we will get an even smoother stepping in a 32bit image than a 16 bit image with the same polycount?