Hi,
I'm not clear, do you want the transparent plane to cast shadows or to
be shadowed?
The latter should be technically possible (haven't tried it in opensg,
but I've coded a few such things myself).
The former is a bit difficult, since partial transparency (and thus
partial shadow) is not readily obtainable with shadow maps (what depth
to put in the shadow map? You would need to track how much shadow/light
there is at different depths. Not possible today). Simple on/off
transparency (i.e. alpha testing) should be possible though.
Regards,
/Marcus
Daniele Pagliani wrote:
Hi everyone,
I’m using the ShadomMapViewport and I need to have a transparent plane
that casts shadows, but the shadow disappears when I set transparency in
the plane material. I.e. using the tutorial 21Shadows, if I use a plane
without texture and i set the transparency:
SimpleMaterialPtr plane_mat = SimpleMaterial::create();
beginEditCP(plane_mat);
plane_mat->setAmbient(Color3f(0.3,0.3,0.3));
plane_mat->setDiffuse(Color3f(1.0,1.0,1.0));
plane_mat->setTransparency(0.5);
//plane_mat->addChunk(plane_tex);
endEditCP(plane_mat);
the shadow disappears.
Does it exists a way to obtain shadow onto a transparent plane?
Thank you.
Regards
Daniele
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ing. Daniele Pagliani
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