[osg-users] Texture projection on terrain and gl_TextureMatrix[0...7]

Glenn Waldron gwaldron at gmail.com
Wed Dec 21 07:17:05 PST 2016

You might try setting your texture border color to transparent.


The index in gl_TextureMatrix[1] is the texture image unit; it should match
the slot you specified in your call to

stateset->setTextureAttributeAndModes(1, texMat, osg::StateAttribute::ON);

Glenn Waldron

On Wed, Dec 21, 2016 at 9:57 AM, Ekaterina Fokina <ekaterina.fokina at tum.de>

> Hello,
> I am trying to understand how to project a texture on a specific part of
> the terrain. There are many examples how to project a texture on a whole
> object, but not to a part of the oblect. That means the question is how to
> specify texture coordinates (using the shader) on order to project a
> texture on a right place?
> I have found an examle in internet:
> http://jotschi.de/2009/05/31/projective-textures-with-openscenegraph/
> But unfortunatelly, It is not working properly and I can see my projection
> on the terrain, but the rest of it is black.
> One more question, does anybody can explain to me what is the difference
> between the numbers in gl_TextureMatrix[0...7]?
> Thank you!
> Cheers,
> Ekaterina
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=69726#69726
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