Terrain · function

decodeTerrainSplat

Sample the four weights at a field coordinate, renormalised so they sum to one.

Explained in Terrain.

function decodeTerrainSplat(layer: TerrainSplatLayer, u: number, v: number, out: Float32Array): void

import { decodeTerrainSplat } from '@driftengine/terrain';

Parameters

Parameter	Type	Description
`layer`	`TerrainSplatLayer`
`u`	`number`
`v`	`number`
`out`	`Float32Array`

In depth

The renormalisation is not tidiness. Four weights each rounded to eight bits sum to anywhere between 0.994 and 1.006, and a shader that trusts the sum draws a hillside slightly too bright or slightly too dark — smoothly, so it reads as lighting rather than as a texture bug. The alternative, storing three weights and deriving the fourth, puts the entire error on one material and is worse for the same total.