A "real " 3d texture. 2003-11-18 - By Bruno Pollet
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This tutorial on volume shading by David Hoffman could be usefull to
you,
http://www.highend3d.com/maya/tutorials/davidhofmann1/
Problem is that you have to use renderprimitives, not actual geometry to
get some result.
Cheers
Bruno
-- --Original Message-- --
From: maya-bounce@(protected) [mailto:maya-bounce@(protected)] On
Behalf Of Hoehne, Brad
Sent: lundi 17 novembre 2003 20:57
To: 'maya@(protected)'
Subject: A "real" 3d texture.
Hi,
I've been trying to simulate a ragged 3 dimensional structure,
with
the 3d structure of a marble texture. As far as I can tell, all
textures
3-d or not, map just to the surface of an object- the 3-d textures
getting their surface information from some solver that figures out what
the 2d surface map should be for the shape at that given point.
Normally, this isn't a problem. However, when one adds transparency to
the object, the superficial nature of the texture becomes clear. If one
applies the "Leather" texture, say, and then maps the 3-d texture to the
transparency of the a lambert shader, one sees that only the surface of
the object contains information about the object, and that the now
semi-trasparent object is not
filled with the 3 dimensional lattice of the leather texture. In other
words, the texture is not a "real" 3-d texture. The object looks
"hollow."
The only way I've managed to get around this and create a "real"
3d texture, is by nestling many many versions of the same shape inside
itself. Say I'm using a sphere. I duplicate the sphere 50 times with,
say, a scale of .98 applied in all three dimensions. So now I have a
bunch of 50 nestled spheres of decreasing size. Then whatever texture
I'm using is applied to all the duplicated objects. If I do a fine
enough number of cuts, and I am careful to have at least some parts of
the texture map completely transparent, then I get a pretty good
facimilie of a "real" 3-d texture.
Can anyone think of another, better, way?
Brad H.
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