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import {
Vector2
} from 'three';
/**
* tool for "unwrapping" and debugging three.js geometries UV mapping
*
* Sample usage:
* document.body.appendChild( UVsDebug( new THREE.SphereGeometry( 10, 10, 10, 10 ) ) );
*
*/
function UVsDebug( geometry, size = 1024 ) {
// handles wrapping of uv.x > 1 only
const abc = 'abc';
const a = new Vector2();
const b = new Vector2();
const uvs = [
new Vector2(),
new Vector2(),
new Vector2()
];
const face = [];
const canvas = document.createElement( 'canvas' );
const width = size; // power of 2 required for wrapping
const height = size;
canvas.width = width;
canvas.height = height;
const ctx = canvas.getContext( '2d' );
ctx.lineWidth = 1;
ctx.strokeStyle = 'rgb( 63, 63, 63 )';
ctx.textAlign = 'center';
// paint background white
ctx.fillStyle = 'rgb( 255, 255, 255 )';
ctx.fillRect( 0, 0, width, height );
const index = geometry.index;
const uvAttribute = geometry.attributes.uv;
if ( index ) {
// indexed geometry
for ( let i = 0, il = index.count; i < il; i += 3 ) {
face[ 0 ] = index.getX( i );
face[ 1 ] = index.getX( i + 1 );
face[ 2 ] = index.getX( i + 2 );
uvs[ 0 ].fromBufferAttribute( uvAttribute, face[ 0 ] );
uvs[ 1 ].fromBufferAttribute( uvAttribute, face[ 1 ] );
uvs[ 2 ].fromBufferAttribute( uvAttribute, face[ 2 ] );
processFace( face, uvs, i / 3 );
}
} else {
// non-indexed geometry
for ( let i = 0, il = uvAttribute.count; i < il; i += 3 ) {
face[ 0 ] = i;
face[ 1 ] = i + 1;
face[ 2 ] = i + 2;
uvs[ 0 ].fromBufferAttribute( uvAttribute, face[ 0 ] );
uvs[ 1 ].fromBufferAttribute( uvAttribute, face[ 1 ] );
uvs[ 2 ].fromBufferAttribute( uvAttribute, face[ 2 ] );
processFace( face, uvs, i / 3 );
}
}
return canvas;
function processFace( face, uvs, index ) {
// draw contour of face
ctx.beginPath();
a.set( 0, 0 );
for ( let j = 0, jl = uvs.length; j < jl; j ++ ) {
const uv = uvs[ j ];
a.x += uv.x;
a.y += uv.y;
if ( j === 0 ) {
ctx.moveTo( uv.x * ( width - 2 ) + 0.5, ( 1 - uv.y ) * ( height - 2 ) + 0.5 );
} else {
ctx.lineTo( uv.x * ( width - 2 ) + 0.5, ( 1 - uv.y ) * ( height - 2 ) + 0.5 );
}
}
ctx.closePath();
ctx.stroke();
// calculate center of face
a.divideScalar( uvs.length );
// label the face number
ctx.font = '18px Arial';
ctx.fillStyle = 'rgb( 63, 63, 63 )';
ctx.fillText( index, a.x * width, ( 1 - a.y ) * height );
if ( a.x > 0.95 ) {
// wrap x // 0.95 is arbitrary
ctx.fillText( index, ( a.x % 1 ) * width, ( 1 - a.y ) * height );
}
//
ctx.font = '12px Arial';
ctx.fillStyle = 'rgb( 191, 191, 191 )';
// label uv edge orders
for ( let j = 0, jl = uvs.length; j < jl; j ++ ) {
const uv = uvs[ j ];
b.addVectors( a, uv ).divideScalar( 2 );
const vnum = face[ j ];
ctx.fillText( abc[ j ] + vnum, b.x * width, ( 1 - b.y ) * height );
if ( b.x > 0.95 ) {
// wrap x
ctx.fillText( abc[ j ] + vnum, ( b.x % 1 ) * width, ( 1 - b.y ) * height );
}
}
}
}
export { UVsDebug };
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