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000193_owner-lightwave-l _Fri Jan 20 02:41:13 1995.msg
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Date: Thu, 19 Jan 1995 15:40:49 -0500 (EST)
From: Joe Angell <jangell@risd.edu>
Subject: Re: Crust Texture
To: gblpcsjc@ibmmail.com
Cc: lightwave-l@netcom.com
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Precedence: bulk
I also have LW 3.5 and I noticed that there is no info on the Crust and
Bump Array. I'm assuming these (and more?) will be documented in 4.0.
Until then, LightWave Pro, Sept. 1994 had a breakdown. Here's how it goes:
Both Textures:
Usage: Clip/Color/Luminocity/Diffuse/Specular Mapping.
Note: These textures (unlike normal textures) can shade like a bump map
while being used as a color map.
Note2: I THINK these are from the Essence Library (reprogramed for LW)
Bump Array:
This puts spherical depressions on the surface. ex: Rocky
superhero skin, spaceship floor, Electric Fence, Golf Ball.
It can raise up or make depressions (I think)
OPTIONS:
RADIUS: radius of the bump spheres. LWPro notes that the sphere
size is in 3D space, so when mapped on a plane, the sphere will
intersect and make depressions of the same size, but on a sphere, the
depressions will seem to be randomly sized (kinda like the dots
texture...)
SPACING: how far the centers of the spheres are from each other.
It's a good idea to keep it higher than the radius or the
depressions will overlap (unless you WANT them to...)
BUMP STRENGTH: How much the spheres affect the map. 0=nothing.
- #s will raise the surface; + #s will make depressions.
CRUST:
This can make neat lunar surface cursts on spheres, or many
organic surfaces.
Coverage: size of the "spots" on top of the texture's ledges that
are the essence of the texture. Small #s make small sopts on wide
ledges. big #s eat away at the ledge untilit is all spot. The
spot is where the surface attributes appear.
Ledge Level: Size of the ledge of the texture. Should be >=
coverage size, or you won't see it.
Ledge Width: Amount of ramping from the surface to the ledge.
Low #s make a sharp cliff; High #s blend into other ledges, making
cellular/organic bumps.
Bump Strength: See Bump Array, except - values sink while + raises.
OK. For more info, I'd chcek out that LWPro (sept 1994, page 16). You
can thank Grant Boucher for writting the article. Hope this helps...
-- Joe