LYGIA Shader Library

Dependencies:

• lygia/math/const.glsl

Use:

<vec3> fisheye2xyz(<vec2> uv)

Check it on Github

#ifndef FNC_FISHEYE2XYZ
#define FNC_FISHEYE2XYZ
vec3 fisheye2xyz(vec2 uv) {
    vec2 ndc = uv * 2.0 - 1.0;
    float R = sqrt(ndc.x * ndc.x + ndc.y * ndc.y);
    vec3 dir = vec3(ndc.x / R, 0.0, ndc.y / R);
    float Phi = (R) * PI * 0.52;
    dir.y   = cos(Phi);//clamp(, MinCos, 1.0);
    dir.xz *= sqrt(1.0 - dir.y * dir.y);
    return dir;
}
#endif

Dependencies:

• lygia/math/const.glsl

Use:

<float3> fisheye2xyz(<float2> uv)

Check it on Github

#ifndef FNC_FISHEYE2XYZ
#define FNC_FISHEYE2XYZ
float3 fisheye2xyz(float2 uv) {
    float2 ndc = uv * 2.0 - 1.0;
    float R = sqrt(ndc.x * ndc.x + ndc.y * ndc.y);
    float3 dir = float3(ndc.x / R, 0.0, ndc.y / R);
    float Phi = (R) * PI * 0.52;
    dir.y   = cos(Phi);//clamp(, MinCos, 1.0);
    dir.xz *= sqrt(1.0 - dir.y * dir.y);
    return dir;
}
#endif

Dependencies:

• lygia/math/const.glsl

Check it on Github

fn fisheye2xyz(uv: vec2f) -> vec3f {
    let ndc = uv * 2.0 - 1.0;
    let R = sqrt(ndc.x * ndc.x + ndc.y * ndc.y);
    var dir = vec3(ndc.x / R, 0.0, ndc.y / R);
    let Phi = (R) * PI * 0.52;
    dir.y   = cos(Phi);
    let s = sqrt(1.0 - dir.y * dir.y);
    dir.x *= s;
    dir.z *= s;
    return dir;
}