Using Lightmaps with Three.js

Is it true that lightmaps function independently of other textures?

It seems like I need to establish a second set of UVs.

I've exported my JSON object with a second set of UVs and included the following code snippet:

geometry.faceVertexUvs[0] = geometry.faceVertexUvs[1];

Unfortunately, I'm not seeing any results. Can anyone provide guidance on what might be missing? Using Three.js r.73

loader.load("model.js", function(geometry){
geometry.faceVertexUvs[0] = geometry.faceVertexUvs[1];

var mesh = new THREE.Mesh( geometry, new THREE.MeshPhongMaterial( {
  color: 0x777777,
  lightMap: THREE.ImageUtils.loadTexture( "lightmap.png" ),
  normalMap: THREE.ImageUtils.loadTexture( "normalmap.png" ),
  specularMap: THREE.ImageUtils.loadTexture( "specularmap.png" )
}));
scene.add(mesh );
});

Answer №1

To utilize lightmaps in three.js, a second set of UVs is necessary. One method involves duplicating the initial set of UVs.

For THREE.Geometry, you can achieve this with the following code snippet:

geometry.faceVertexUvs[ 1 ] = geometry.faceVertexUvs[ 0 ];

When working with THREE.BufferGeometry, follow this pattern:

var uvs = geometry.attributes.uv.array;
geometry.addAttribute( 'uv2', new THREE.BufferAttribute( uvs, 2 ) );

This information pertains to version r.73 of three.js

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