Maths · interface
Bounds
How big a piece of geometry is, and where it sits.
Explained in Coordinates and units.
interface Boundsimport type { Bounds } from '@driftengine/core';In depth
Nothing in this engine knew either until now, which is why there has never been a frustum
test: a renderer cannot decide whether a mesh is on screen without knowing what part of space
it occupies. CAPABILITIES.md recorded the consequence — no draw culling at all, only backface
— and every track on the roadmap that wants culling, level of detail, a broadphase or a
bounding gizmo wants this object first.
Both a box and a sphere, because the two answer different questions cheaply. A sphere survives an arbitrary transform as a sphere, which makes it the right shape for a per-draw visibility test; a box is tighter and is what a physics broadphase and an editor's selection want.
Properties
| Name | Type | Description |
|---|---|---|
minreadonly | Float32Array | The axis-aligned box, in the geometry's own space. |
maxreadonly | Float32Array | |
centrereadonly | Float32Array | The box's midpoint, which is what the radius is measured from. |
radius | number | The furthest vertex from centre. See boundsOfPositions for why not half the diagonal. |