Struct ObjLod 

pub struct ObjLod {
    pub levels: Vec<ObjMesh>,
    pub thresholds: Vec<f64>,
}

A level-of-detail collection: multiple meshes at decreasing resolution.

Fields

levels: Vec<ObjMesh>

LOD levels, index 0 = highest detail.

thresholds: Vec<f64>

Distance thresholds at which to switch to the next LOD level. thresholds[i] is the max distance for levels[i].

Implementations

impl ObjLod

pub fn new() -> Self

Create an empty LOD set.

pub fn push(&mut self, mesh: ObjMesh, threshold: f64)

Add a LOD level with the given switch distance.

pub fn select(&self, distance: f64) -> Option<&ObjMesh>

Select the appropriate LOD level for a viewing distance.

pub fn num_levels(&self) -> usize

Number of LOD levels.

pub fn decimate(mesh: &ObjMesh, target_faces: usize) -> ObjMesh

Simplify a mesh to approximately target_faces triangles using Quadric Error Metric (QEM) edge-collapse.

Implements the Garland–Heckbert (1997) algorithm:

1. Compute per-face error quadrics from plane equations.
2. Sum quadrics at each vertex.
3. For every edge, compute the optimal collapse target position and its associated cost.
4. Greedily collapse the minimum-cost edge until target_faces is reached, using a lazy-deletion min-heap.

Trait Implementations

impl Clone for ObjLod

fn clone(&self) -> ObjLod

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ObjLod

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

Formats the value using the given formatter.

impl Default for ObjLod

fn default() -> ObjLod

Returns the “default value” for a type.