Alpha Map Export Issue in gltf

hellboy_2310 · November 8, 2025, 7:13am

I am facing one issue when i am exporting my scene using gltf exporter than i am not able to get alpha map and mask map in the exported gltf and is not visible in gltfviewer as well, i need help that how can i show the alpha map and mask map in gltf as well

donmccurdy · November 10, 2025, 12:38am

The glTF file format doesn’t have the same distinct .map vs. .alphaMap concepts as three.js — you’ll need to use the alpha channel of .map instead. If you don’t need the RGB channels, they can be set to #FFFFFF to have no effect on the rest of the material.

Reference:

github.com/mrdoob/three.js

examples/jsm/exporters/GLTFExporter.js

ef887d48d


      
          		cache.textures.set( map, index );
          		return index;
          
          	}
          
          	/**
          	 * Process material
          	 * @param {THREE.Material} material Material to process
          	 * @return {Promise<?number>} Index of the processed material in the "materials" array
          	 */
          	async processMaterialAsync( material ) {
          
          		const cache = this.cache;
          		const json = this.json;
          
          		if ( cache.materials.has( material ) ) return cache.materials.get( material );
          
          		if ( material.isShaderMaterial ) {
          
          			console.warn( 'GLTFExporter: THREE.ShaderMaterial not supported.' );
          			return null;

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Alpha Map Export Issue in gltf

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