Hi weihuan,
i use osgshadow in osgart, the shadow map work fine. the model is standing on a
plane, shadow cast to the plane, the plane is attach to the pattern, what i
want is to make the plane invisible but the shadow remains, to make it looks
like shadow on the top of pattern. i try alpha blending the plane, the result
is not good, shadow become transparency too.
You'll have to create your own shader based on the one that shadow map
uses (you didn't specify which shadow map class you use, but the shader
code is in the source files, see for example
osg/src/osgShadow/ShadowMap.cpp, or osg/src/osgShadow/SoftShadowMap.cpp,
or osg/src/osgShadow/StandardShadowMap.cpp for LISPSM).
Just copy the default shader code, and then change it to do what you
want. For example, you could set a Uniform bool to false on your scene
root, then to true on your plane, and in your shader you would test this
value and if true, simply discard fragments if the shadow test fails and
render the shadow color if the shadow test succeeds.
There could be other ways to do what you want, this is just off the top
of my head.
Hope this helps,
J-S
--
______________________________________________________
Jean-Sebastien Guay jean-sebastien.g...@cm-labs.com
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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