View Full Version : Are Multi-layer Materials resource intensive? What about your average Materials?

06-07-2012, 12:02 AM

Does anybody have experience using the multi-layer materials? My specific question would be; how computationally intensive is it?

Example: If my scene is 8-12 million polygons on a 3gb card, is it ill-advised to use multi-layered materials?

On another note, does anyone know specifically how resource intensive material maps (color, specular, bump) are? How does it factor into my vram? Having this knowledge would help in estimating the setup of scenes :)

Thanks in advance.

08-16-2012, 01:13 AM
Hi :)

Multilayer materials currently will duplicate any geometry they are placed on; If you have a 4-layer material on a 100k polygon part; you've just added 300k polygons. This makes them relatively expensive.

Textures of the standard types (color, specular, bump/normal, opacity, anisotropy) are not expensive in rendering time, but do consume VRAM. Textures have to be fully uncompressed in VRAM for use. A normal 1024x1024 image will occupy 4 MB of VRAM, give or take.

Displacement maps are quite expensive, so take care before enabling displacement. :) Normal/Bump maps are more like a color map w/r/t speed.