Struct DrawGeometryUpdate 

pub struct DrawGeometryUpdate {
    pub draw_idx: usize,
    pub vertices: Vec<Vertex>,
    pub indices: Vec<u16>,
    pub lod_alternates: Vec<(f32, Vec<u16>)>,
}

One draw slot’s fresh geometry, supplied to RenderBackend::rebuild_static_geometry when an asset hot-reload changed its vertex / index count and the slot can no longer hold the new data in place. The backend rebuilds the entire shared vertex / index buffer; draws not named here keep their current geometry, copied byte-for- byte from the live buffers. indices are mesh-relative (0-based); the backend rebases them onto whatever new vertex region the draw lands in.

Fields

draw_idx: usize

The draw slot whose geometry is replaced.

vertices: Vec<Vertex>

Replacement vertices.

indices: Vec<u16>

Replacement indices, mesh-relative.

lod_alternates: Vec<(f32, Vec<u16>)>

One slice per additional LOD, ordered mip 0 → mip N-1. Each is (switch_distance, mesh-relative indices). Empty for meshes declared lod_levels <= 1.