arx-level-generator/dist/src/tools/mesh/scaleUV.js

A tool for creating Arx Fatalis maps

import { Vector2 } from 'three';
/**
 * only works with tileable textures
 *
 * multiplies uv coordinates in a way that allows textures to be tiled or flipped
 *
 * `scaleUV(new Vector2(2, 3), geometry)` will shrink the texture in a way
 * that the texture will fit 2 times horizontally and 3 times vertically
 *
 * `scaleUV(new Vector(-1, 1), geometry)` will flip the texture horizontally
 * `scaleUV(new Vector(1, -1), geometry)` will flip the texture vertically
 */
export const scaleUV = (scale, geometry) => {
    if (scale.x === 1 && scale.y === 1) {
        return;
    }
    const uv = geometry.getAttribute('uv');
    for (let idx = 0; idx < uv.count; idx++) {
        const u = uv.getX(idx) * scale.x;
        const v = uv.getY(idx) * scale.y;
        uv.setXY(idx, u, v);
    }
};
export const normalizeUV = (geometry) => {
    const uv = geometry.getAttribute('uv');
    for (let idx = 0; idx < uv.count; idx++) {
        let u = uv.getX(idx);
        let v = uv.getY(idx);
        if (u < 0) {
            u = 1 + (u % 1);
        }
        else if (u > 1) {
            u = u % 1;
        }
        if (v < 0) {
            v = 1 + (v % 1);
        }
        else if (v > 1) {
            v = v % 1;
        }
        uv.setXY(idx, u, v);
    }
};
export const flipUVHorizontally = (geometry) => {
    return scaleUV(new Vector2(-1, 1), geometry);
};
export const flipUVVertically = (geometry) => {
    return scaleUV(new Vector2(1, -1), geometry);
};
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