Struct PhysicsMeshBvhNode 

pub struct PhysicsMeshBvhNode { /* private fields */ }

DMMN — Physics mesh BVH node (v0: 12 bytes, v1: 8 bytes)

DMMN entries form a linearized k-DOP Bounding Volume Hierarchy (BVH) tree for concave mesh collision. The entry count is always odd: n = 2*n_leaves - 1.

Tree structure — right-skewed binary tree stored in DFS preorder: - Array layout: (INT_0, LEAF_1), (INT_2, LEAF_3), …, LEAF_{n-1} - Even indices 0..n-3: internal nodes - Odd indices 1..n-2: leaf nodes - Last index n-1: leaf node - Each internal node 2k: left child = leaf 2k+1, right child = node 2k+2

v0 (Havok-era, 12 bytes per node) — stores only the slab normal direction as a plain Vector3f. No quantized slab bounds are present; the tree topology and bounding-slab directions are identical to v1, but distance culling relies on the runtime computing slab projections against meshBoundsCenter/Extent. Only 3 files in the corpus use v0 (all with PHSH v2).

v1 (Domino physics, 8 bytes per node) — octahedral-encoded normal + quantized slab bounds: - i16 octX, octY: octahedral-mapped slab normal (snorm16 pair) - u16 slabMin, slabMax: quantized bounding-slab distances along the normal - Internal nodes: slabMax != 0; leaf sentinel: slabMax == 0 (except the last node, which may have slabMax != 0 despite being a leaf)

Quantization (v1, universally confirmed across 468 corpus files): - Per-axis step: tol_i = extent_i / 32767 - Projected step: tol_proj = dot(tolerance, |normal|) - Slab values quantized as: q = round(projection / tol_proj) - Root node slab range approaches [-32767, +32767] (full AABB)

Internal nodes use one slab direction; their paired leaf uses a DIFFERENT slab direction, forming a 2-DOP bound per primitive group. Most trees (391/468) use multiple slab normals across internal levels for tighter culling.

PHSH meshTreeDepth gives the tree height (longest root-to-leaf path in nodes).

Implementations

impl PhysicsMeshBvhNode

pub fn new() -> Self

Panics

Panics if the native allocation fails.

Trait Implementations

impl Debug for PhysicsMeshBvhNode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PhysicsMeshBvhNode

fn default() -> Self

Returns the “default value” for a type.

impl Drop for PhysicsMeshBvhNode

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

impl Send for PhysicsMeshBvhNode