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Use a linear interpolation to find the point where the parallax ray intersects the surface more accurately.

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This was SVN commit r12394.
This commit is contained in:
Jonathan Waller 2012-08-12 14:50:56 +00:00
parent 3b704b12a9
commit b1090d1a12
1 changed files with 10 additions and 2 deletions
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12
binaries/data/mods/public/shaders/glsl/model_common.fs
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@ -121,11 +121,13 @@ void main()
#endif
s = 1.0 / iter;
float t = s;
move = vec2(-eyeDir.x, eyeDir.y) * scale / (eyeDir.z * iter);
vec2 nil = vec2(0.0);
#define PARALLAX_ITER {\
height -= s;\
height -= t;\
t = (h < height) ? s : 0.0;\
vec2 temp = (h < height) ? move : nil;\
coord += temp;\
h = texture2D(normTex, coord).a;\
@ -162,7 +164,13 @@ void main()
PARALLAX_ITER
PARALLAX_ITER
#endif
#endif
#endif
// Move back to where we collided with the surface.
// This assumes the surface is linear between the sample point before we
// intersect the surface and after we intersect the surface
float hp = texture2D(normTex, coord - move).a;
coord -= move * ((h - height) / (s + h - hp));
}
#endif