Function extract_frustum_planes

native/shared/src/scene.rs:1016–1030

(vp: &[[f32; 4]; 4])

// — we only care about the sign.

pub(crate) fn extract_frustum_planes(vp: &[[f32; 4]; 4]) -> [[f32; 4]; 6] {
    // Row vectors of the column-major matrix: row_i[col] = vp[col][i].
    let row = |i: usize| [vp[0][i], vp[1][i], vp[2][i], vp[3][i]];
    let r0 = row(0); let r1 = row(1); let r2 = row(2); let r3 = row(3);
    let add = |a: [f32;4], b: [f32;4]| [a[0]+b[0], a[1]+b[1], a[2]+b[2], a[3]+b[3]];
    let sub = |a: [f32;4], b: [f32;4]| [a[0]-b[0], a[1]-b[1], a[2]-b[2], a[3]-b[3]];
    [
        add(r3, r0), // left
        sub(r3, r0), // right
        add(r3, r1), // bottom
        sub(r3, r1), // top
        r2,          // near (wgpu uses 0..1 depth → near = row_2)
        sub(r3, r2), // far
    ]
}

pub(crate) fn aabb_outside_frustum(planes: &[[f32; 4]; 6], bmin: [f32; 3], bmax: [f32; 3]) -> bool {
    for p in planes.iter() {