Thread: Rayleigh scattering shader

Hmm, makes sense. I calculate the angle as a dot product of the view and light vectors:

Code:

vec4 wPos = mWorld*gl_Vertex; //world matrix * "in" vertex position
vec3 lPos = vec3(0.0, 10000.0, 5000.0);

vec3 V = normalize(wPos.xyz - eyePosition);
vec3 L = normalize(lPos - eyePosition);

float theta = dot(L, V);

Sorry for the slow replying. I'm running out of free time these days (I'm done working weekends now though...hopefully that'll give me a bit more play time ).

I tried:

Code:

float theta = dot(L, V);
float acosTheta = acos(theta);
float acosTheta2 = acosTheta*acosTheta;

Using acosTheta in place of theta in the formulas, the the overall result is the same - no colour changes (using acos did require me to remove the coefficient multipliers, as with them the sky was too dark).

There's something here somewhere, that I'm (frustratingly) just not getting. Mathematically, everything looks like it should do what it's supposed to.

Could it be affected by sky sphere tessellation? Not likely, but it's just a thought.