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GtkRadiant/What Shaders can do
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Shader Syntax What Shaders can do Your First Shader
With shaders you can:
Make surfaces/volumes behave in certain ways ingame (water, lava, nonsolid, etc..)
Blend multiple textures together in various ways
Create surface sprites (useful for grass etc.)
Create blended terrain
Create scrolling, rotating textures.
Make textures glow ingame
Provide lighting to your map (light-emitting shaders)
Combinations of the above