void main() {
    float Strength = 1;
    float Height = tan(2.47837 * 0.5);//Vertical FOV in Radians https://themetalmuncher.github.io/fov-calc/ Degrees * pi/180 = Radians
    float AspectRatio = (4/3);
    float CylindricalRatio = 100.0; //1 = Spherical 0 = Flat but you can go beyond

    float ScaledHeight = Strength * Height;
    float CylAspectRatio = AspectRatio * CylindricalRatio;
    float AspectDiagSq = AspectRatio * AspectRatio + 1.0;
    float DiagSq = ScaledHeight * ScaledHeight * AspectDiagSq;
    vec2 SignedUV = (2.0 * TexCoord + vec2(-1.0, -1.0));

    float z = 0.5 * sqrt(DiagSq + 1.0) + 0.5;
    float ny = (z - 1.0) / (CylAspectRatio * CylAspectRatio + 1.0);

    vec2 vUVDot = sqrt(ny) * vec2(CylAspectRatio, 1.0) * SignedUV;
    vec3 vUV = vec3(0.5, 0.5, 1.0) * z + vec3(-0.5, -0.5, 0.0);
    vUV.xy += TexCoord;

    vec3 uv2 = dot(vUVDot, vUVDot) * vec3(-0.5, -0.5, -1.0) + vUV;
    //uv2.xy = uv2.xy / uv2.z;

    vec4 c = texture2DProj(InputTexture, uv2);

    FragColor = c;

}