Hi everyone,
I am currently trying to set two textures on a geometry. To mix both textures I
use a texEnvCombine with INTERPOLATE. That is how I did that:
Code:
//Initialize and Set the first texture.
osg::Texture2D* tex = new osg::Texture2D(osgDB::readImageFile("im1.jpg"));
tex->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR_MIPMAP_LINEAR);
tex->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
tex->setWrap(osg::Texture::WRAP_S, osg::Texture::REPEAT);
tex->setWrap(osg::Texture::WRAP_T, osg::Texture::REPEAT);
geode->getOrCreateStateSet()->setTextureAttributeAndModes(0, tex,
osg::StateAttribute::ON);
//I use a texmat to repeat the texture ten times.
osg::TexMat* texmat = new osg::TexMat(osg::Matrix::scale(10,10,1.0));
geode->getOrCreateStateSet()->setTextureAttributeAndModes(0, texmat);
//I configure my texEnvCombine.
osg::TexEnvCombine* texEnv = new osg::TexEnvCombine();
texEnv->setCombine_RGB(osg::TexEnvCombine::INTERPOLATE);
texEnv->setSource0_RGB(osg::TexEnvCombine::PREVIOUS);
texEnv->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
texEnv->setSource1_RGB(osg::TexEnvCombine::TEXTURE);
texEnv->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
texEnv->setSource2_RGB(osg::TexEnvCombine::PRIMARY_COLOR);
texEnv->setOperand2_RGB(osg::TexEnvCombine::SRC_COLOR);
geode->getOrCreateStateSet()->setTextureAttribute(1, texEnv);
// And I set my second texture.
osg::Texture2D* tex2 = new osg::Texture2D(osgDB::readImageFile("im2.jpg"));
tex2->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR_MIPMAP_LINEAR);
tex2->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
tex2->setWrap(osg::Texture::WRAP_S, osg::Texture::REPEAT);
tex2->setWrap(osg::Texture::WRAP_T, osg::Texture::REPEAT);
geode->getOrCreateStateSet()->setTextureAttributeAndModes(1, tex2,
osg::StateAttribute::ON);
geode->getOrCreateStateSet()->setTextureAttributeAndModes(1, texmat);
With that code it works perfectly when I set GL_LIGHTING to OFF on the geode.
But when I put the lights on, it has issues. In fact it is logical issues:
- My combine is set to INTERPOLATION, that's why the mixing will follow the
function: Arg0*Arg2 + Arg1*(1 - Arg2)
- Here Arg0 is my first texture (PREVIOUS), Arg1 is my second one (TEXTURE) and
the weight Arg2 is the PRIMARY_COLOR which is different at each place of my
geometry.
- That's why it will return bad results when I have lights: the PRIMARY_COLOR
will change with them (example: according to the function, all shadowed area
will automatically set more of the second texture and vice versa.)
Which brings me to my question:
Is there a way to disable the light just for this combination ?
Thank you.
Guillaume[/code]
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=42518#42518
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