Function build_card_ortho_v2

native/shared/src/renderer/mod.rs:372–423

Ticket 013 V2 — orthographic projection for the 6 signed axes. `face_axis` encoding: 0 → +X, 1 → -X, 2 → +Y, 3 → -Y, 4 → +Z, 5 → -Z. For each face we pick the two orthogonal AABB axes and map them to clip-space [-1, +1]. The ±pair for each axis differ only in the sign of the "u" clip axis so that when the HW shader picks axis N at hit and projects the hit into card UV, the UV lines up with the mes

(face_axis: u32, bmin: [f32; 3], bmax: [f32; 3])

/// axis N at hit and projects the hit into card UV, the UV lines up
/// with the mesh geometry as seen FROM that face.
fn build_card_ortho_v2(face_axis: u32, bmin: [f32; 3], bmax: [f32; 3]) -> [[f32; 4]; 4] {
    let wx = (bmax[0] - bmin[0]).max(1e-4);
    let wy = (bmax[1] - bmin[1]).max(1e-4);
    let wz = (bmax[2] - bmin[2]).max(1e-4);
    let cx = bmin[0] + bmax[0];
    let cy = bmin[1] + bmax[1];
    let cz = bmin[2] + bmax[2];
    match face_axis {
        // +X → project onto YZ; clip.x = y, clip.y = z.
        0 => [
            [0.0, 0.0, 0.0, 0.0],
            [2.0/wy, 0.0, 0.0, 0.0],
            [0.0, 2.0/wz, 0.0, 0.0],
            [-cy/wy, -cz/wz, 0.0, 1.0],
        ],
        // -X → flip u so the -X view is the mirror of +X. clip.x = -y, clip.y = z.
        1 => [
            [0.0, 0.0, 0.0, 0.0],
            [-2.0/wy, 0.0, 0.0, 0.0],
            [0.0, 2.0/wz, 0.0, 0.0],
            [cy/wy, -cz/wz, 0.0, 1.0],
        ],
        // +Y → project onto XZ; clip.x = x, clip.y = z.
        2 => [
            [2.0/wx, 0.0, 0.0, 0.0],
            [0.0, 0.0, 0.0, 0.0],
            [0.0, 2.0/wz, 0.0, 0.0],
            [-cx/wx, -cz/wz, 0.0, 1.0],
        ],
        // -Y → flip u; clip.x = -x, clip.y = z.
        3 => [
            [-2.0/wx, 0.0, 0.0, 0.0],
            [0.0, 0.0, 0.0, 0.0],
            [0.0, 2.0/wz, 0.0, 0.0],
            [cx/wx, -cz/wz, 0.0, 1.0],
        ],
        // +Z → project onto XY; clip.x = x, clip.y = y.
        4 => [
            [2.0/wx, 0.0, 0.0, 0.0],
            [0.0, 2.0/wy, 0.0, 0.0],
            [0.0, 0.0, 0.0, 0.0],
            [-cx/wx, -cy/wy, 0.0, 1.0],
        ],
        // -Z → flip u; clip.x = -x, clip.y = y.
        _ => [
            [-2.0/wx, 0.0, 0.0, 0.0],
            [0.0, 2.0/wy, 0.0, 0.0],
            [0.0, 0.0, 0.0, 0.0],
            [cx/wx, -cy/wy, 0.0, 1.0],
        ],
    }
}

/// Ticket 014 — per-mesh SDF bake uniform.
#[repr(C)]