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fn get_normal_basic(p: vec3<f32>, obj_type: f32) -> vec3<f32> {
if (obj_type == 1.0) { return normalize(p); }
let e = vec2<f32>(0.001, 0.0);
return normalize(vec3<f32>(
get_dist(p + e.xyy, obj_type) - get_dist(p - e.xyy, obj_type),
get_dist(p + e.yxy, obj_type) - get_dist(p - e.yxy, obj_type),
get_dist(p + e.yyx, obj_type) - get_dist(p - e.yyx, obj_type)
));
}
// Distance to an Axis-Aligned Bounding Box
fn aabb_sdf(p: vec3<f32>, min_p: vec3<f32>, max_p: vec3<f32>) -> f32 {
let center = (min_p + max_p) * 0.5;
let extent = (max_p - min_p) * 0.5;
let q = abs(p - center) - extent;
return length(max(q, vec3<f32>(0.0))) + min(max(q.x, max(q.y, q.z)), 0.0);
}
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