Material: Set alphaTest to null by default

src/materials/Material.js

@@ -62,7 +62,7 @@ class Material extends EventDispatcher {
 
 		this.dithering = false;
 
-		this.alphaTest = 0;
+		this.alphaTest = null;
 		this.alphaToCoverage = false;
 		this.premultipliedAlpha = false;
 
@@ -308,7 +308,7 @@ class Material extends EventDispatcher {
 
 		if ( this.dithering === true ) data.dithering = true;
 
-		if ( this.alphaTest > 0 ) data.alphaTest = this.alphaTest;
+		if ( this.alphaTest !== null ) data.alphaTest = this.alphaTest;
 		if ( this.alphaToCoverage === true ) data.alphaToCoverage = this.alphaToCoverage;
 		if ( this.premultipliedAlpha === true ) data.premultipliedAlpha = this.premultipliedAlpha;
 

src/renderers/shaders/ShaderChunk/alphatest_fragment.glsl.js

 export default /* glsl */`
+#ifdef USE_ALPHATEST
 
 	if ( diffuseColor.a < alphaTest ) discard;
 
+#endif
 `;

src/renderers/shaders/ShaderChunk/alphatest_pars_fragment.glsl.js

 export default /* glsl */`
+#ifdef USE_ALPHATEST
 
 	uniform float alphaTest;
 
+#endif
 `;

src/renderers/webgl/WebGLMaterials.js

@@ -107,7 +107,6 @@ function WebGLMaterials( properties ) {
 
 	function refreshUniformsCommon( uniforms, material ) {
 
-		uniforms.alphaTest.value = material.alphaTest;
 		uniforms.opacity.value = material.opacity;
 
 		if ( material.color ) {
@@ -134,6 +133,12 @@ function WebGLMaterials( properties ) {
 
 		}
 
+		if ( material.alphaTest !== null ) {
+
+			uniforms.alphaTest.value = material.alphaTest;
+
+		}
+
 		if ( material.specularMap ) {
 
 			uniforms.specularMap.value = material.specularMap;

src/renderers/webgl/WebGLProgram.js

@@ -607,6 +607,7 @@ function WebGLProgram( renderer, cacheKey, parameters, bindingStates ) {
 			parameters.roughnessMap ? '#define USE_ROUGHNESSMAP' : '',
 			parameters.metalnessMap ? '#define USE_METALNESSMAP' : '',
 			parameters.alphaMap ? '#define USE_ALPHAMAP' : '',
+			parameters.alphaTest ? '#define USE_ALPHATEST' : '',
 
 			parameters.sheen ? '#define USE_SHEEN' : '',
 			parameters.transmission ? '#define USE_TRANSMISSION' : '',

src/renderers/webgl/WebGLPrograms.js

@@ -38,7 +38,7 @@ function WebGLPrograms( renderer, cubemaps, extensions, capabilities, bindingSta
 		'map', 'mapEncoding', 'matcap', 'matcapEncoding', 'envMap', 'envMapMode', 'envMapEncoding', 'envMapCubeUV',
 		'lightMap', 'lightMapEncoding', 'aoMap', 'emissiveMap', 'emissiveMapEncoding', 'bumpMap', 'normalMap', 'objectSpaceNormalMap', 'tangentSpaceNormalMap', 'clearcoatMap', 'clearcoatRoughnessMap', 'clearcoatNormalMap', 'displacementMap', 'specularMap',
 		'roughnessMap', 'metalnessMap', 'gradientMap',
-		'alphaMap', 'combine', 'vertexColors', 'vertexAlphas', 'vertexTangents', 'vertexUvs', 'uvsVertexOnly', 'fog', 'useFog', 'fogExp2',
+		'alphaMap', 'alphaTest', 'combine', 'vertexColors', 'vertexAlphas', 'vertexTangents', 'vertexUvs', 'uvsVertexOnly', 'fog', 'useFog', 'fogExp2',
 		'flatShading', 'sizeAttenuation', 'logarithmicDepthBuffer', 'skinning',
 		'maxBones', 'useVertexTexture', 'morphTargets', 'morphNormals', 'premultipliedAlpha',
 		'numDirLights', 'numPointLights', 'numSpotLights', 'numHemiLights', 'numRectAreaLights',
@@ -197,6 +197,7 @@ function WebGLPrograms( renderer, cubemaps, extensions, capabilities, bindingSta
 			metalnessMap: !! material.metalnessMap,
 			specularMap: !! material.specularMap,
 			alphaMap: !! material.alphaMap,
+			aphaTest: material.alphaTest !== null,
 
 			gradientMap: !! material.gradientMap,