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View Full Version : Does LW do diffuse transmission?



Turner
01-19-2004, 06:54 AM
Just wondering.

For those of you unsure of what I mean, exactly (including myself ;) ) and example would be a lampshade being lit from the inside but still transmitting light data based on its material settings; another is frosted glass (nontransparent but transmits a high degree of light) and another would be thin curtains, semitransparent but perhaps hit by a little square of sunlight which in turn brightly (but diffusely) lights a room.

Thanks,
Andrew

head worm
01-20-2004, 08:16 AM
Hi there Andrew,

Lightwave has two settings that produce a diffuse transmission effect depending on the circumstances.

The Translucency setting works very well for lampshades; it's fast rendering and effective when light sources are behind your translucent surface. The translucency setting allows a certain amount of the light from Lightwave lights to pass straight through. You can't see geometry through translucent surfaces, but lampshades - where there's usually a light inside - look very realistic with this switched on.

The Refraction Blurring setting (found in the Surface Editor's Environment Tab) will blur transparency for surfaces with some transparency and a refraction index higher than 1.0. This effect is useful in situations where you actually need to see geometry behind an object - such as smoked glass doors - but results in a major rendering overhead.

Another transmission effect - sub surface scattering - is not yet supported within Lightwave, but can be achieved using Worley Lab's G2, or the shader plugin Ogo-Hikari. You can find this on Flay.com

Cheers

Head Worm
www.the-worms-of-art.com