volmetrics
view data/shaders/transfer.f.glsl @ 35:df4a277adb82
port to macosx
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Fri, 06 Feb 2015 21:15:23 +0200 |
| parents | |
| children |
line source
1 uniform sampler3D tex;
2 uniform float tmin;
3 uniform float tmax;
5 float transfer(float x, float tmin, float tmax)
6 {
7 float dt = 0.25 * (tmax - tmin);
8 return smoothstep(tmin - dt, tmin + dt, x) *
9 (1.0 - smoothstep(tmax - dt, tmax + dt, x));
10 }
12 void main()
13 {
14 float texel = texture3D(tex, gl_TexCoord[0].xyz).x;
15 float val = transfer(texel, tmin, tmax);
17 gl_FragColor = vec4(val, val, val, 1.0);
18 }