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shader OslCamera(
    float Distortion = 0.0
    [[
        string help = "Lens distortion",
        float min = -1.0,
        float max = 1.0
    ]],
    
    float Scale = 1.0
    [[
        string help = "View scale",
        float min = 0.1,
        float max = 2.0
    ]],
    
    output point pos = 0,
    output vector dir = 0,
    output float tMax = 1.0/0.0)
{
    pos = P;
    vector right = cross(I, N);
    
    // Apply scale and distortion to UV coordinates
    float uu = (u - 0.5);
    float vv = (v - 0.5);
    
    // Optional radial distortion
    if (Distortion != 0.0) {
        float r2 = uu * uu + vv * vv;
        float f = 1.0 + Distortion * r2;
        uu *= f;
        vv *= f;
    }
    
    // Apply scale
    uu *= Scale;
    vv *= Scale;
    
    dir = I + right * uu + N * vv;
}