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gen 3d direction
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//x is theta in range(0, pi), y is phi in range(0, 2pi), solid angle pi/8 | |
layout(local_size_x = 8, local_size_y = 16, local_size_z = 1) in; | |
//using local group for theta and phi | |
#define M_PI 3.141592653f | |
vec3 get_direction() | |
{ | |
vec2 pos = vec2(gl_LocalInvocationID.xy) / vec2(gl_WorkGroupSize.xy); | |
float theta = mix(0.0f, M_PI, pos.x); //theta is 0 at north pole, pi at south pole | |
float phi = mix(0.0f, 2.0f * M_PI, pos.y); //phi is 0 at +x direction, PI at -x direction. | |
return vec3(sin(theta) * cos(phi), //this is right hand y-up coordinate system. | |
cos(theta), | |
sin(theta) * sin(phi)); | |
} | |
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