stk-code_catmod/data/shaders/lightbeam.frag

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// Jean-manuel clemencon supertuxkart
// Creates a cone lightbeam effect by smoothing edges
// Original idea: http://udn.epicgames.com/Three/VolumetricLightbeamTutorial.html
// TODO: Soft edges when it intesects geometry
// Some artefacts are still visible
uniform sampler2D main_texture;
uniform float transparency;
varying vec2 uv;
varying vec3 eyeVec;
varying vec3 normal;
void main()
{
float inter = dot(normal, eyeVec);
float m = texture2D(main_texture, vec2(0.5, uv.y)).r;
gl_FragColor = vec4(1.0,1.0,0.8, 1.0);
gl_FragColor.a = inter * inter * inter * inter * m;
}