assets/final/shaders/render/shadows.wgsl


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fn calc_shadow(ro: vec3<f32>, rd: vec3<f32>, tmin: f32, tmax: f32, skip_idx: u32) -> f32 {
    var res = 1.0;
    var t = tmin;
    if (t < 0.05) { t = 0.05; } 
    for (var i = 0; i < 32; i = i + 1) {
        let h = map_scene(ro + rd * t, skip_idx);
        if (h < 0.001) { return 0.0; }
        res = min(res, 16.0 * h / t); 
        t = t + clamp(h, 0.02, 0.4);
        if (t > tmax) { break; }
    }
    return clamp(res, 0.0, 1.0);
}