[osg-users] osgShadow: shadow is seen on the opposite side of the model too

[Pierre-Jean Petitprez]

Hi,

I am using osgShadow for adding soft shadows to my scene. My scene has a big cube that receives shadows and some small objects above it that cast shadows. My light is placed above all the objects.
The big cube receives correctly the shadows on its top face (perfectly as it should be), but also on its bottom face, as if the cube's top face was transparent. But in the real world it would never happen, as the top face should stop the light rays to reach the bottom face...

Please see the attached file to understand what I mean.

This problem also appears in the osgshadow example (I have added a box in the scene with the cessnas and I see the same thing) and with every shadow technique, so I guess it is in osgShadow's implementation.

How can I do to avoid the shadows to be seen on the opposite faces of the receivers ?
Thank you.

Cheers,
Pierre-Jean

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http://forum.openscenegraph.org/viewtopic.php?p=65654#65654




Attachments: 
http://forum.openscenegraph.org//files/shadows_969.png