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Poser 4 introduces the concept of transparency maps. This can be very useful for
making hair look more realistic, and for re-tailoring some of the clothes.
Although Poser 3 doesn't have transparency maps, there's no reason why you
can't use the technique in POVRay on a model that originated in Poser 3.
The above image uses transparency maps on the hair and eyelashes (which aren't particularly noticeable
on these small images) and another on the Poser4 t-shirt to convert it into a "hot top".
The technique to use for implementing transparency maps in POVRay is the pigment_pattern.
You can use this to map black areas of the transparency map to an invisible texture and
white areas to a visible texture. The invisible texture shouldn't have highlights, but the
visible parts of the texture can be given highlights without affecting the invisible parts.
This pigment pattern texture uses an image map for the visible parts.
#declare ShirtTex = texture {
pigment_pattern {image_map {jpeg "transmap.jpg" interpolate 2}}
texture_map {
[0 pigment {rgbt <0,0,0,1>}]
[1 pigment {image_map {jpeg "texture.jpg" interpolate 2}}]
}
}
This pigment pattern texture uses a simple pigment for the visible part.
#declare LashTex = texture {
pigment_pattern {image_map {jpeg "translash.jpg" interpolate 2}}
texture_map {
[0 pigment {rgbt <0,0,0,1>}]
[1 pigment{rgb <.8,.4,.3>}]
}
}
Hint: if a light ray has to travel through several layers of invisible cloth
it will only go through as many layers as are specified by max_trace_level, and then
return a black pixel. If you see strange black patches in parts of the object that
should be invisible, try adding something like this to the start of the scene:
global_settings {max_trace_level 10}
There's a full size rendering of the POVRay image here (67kb).
The hair texture and transparency map are by Kozaburo and Yamato, and are
available from the Poser Factory
(but there's now a better version "Kyoko Hair Mk-2" at Digital Babes)
Texture Map |
Transparency Map |
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