Hi Max,
Well, one year ago I was ignorant too in OpenGL and shaders, now I'm
still ignorant in OpenGL but I begin to understand how to use shaders
;-)
For shaders, the first reference is the orange book (Addison Wesley -
2006 - OpenGL Shading Language).
But here are some cool tutorials:
For toon shader, lighting, texturing:
http://www.lighthouse3d.com/opengl/glsl/
And the best tutorials I've found are here: (in French... I like it
but maybe you not)
http://www.ozone3d.net/tutorials/index_glsl.php
In particularly, there is a tutorial which explains how to do
projective texture mapping:
http://www.ozone3d.net/tutorials/glsl_texturing_p08.php#part_8
And to use shaders in OSG, you can find tutorials in the OSG website:
http://www.openscenegraph.org/projects/osg/wiki/Support/Tutorials
Hope this help :)
Josselin.
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