Merge pull request #13479 from WestLangley/dev-unpack_depth

UnpackDepthRGBAShader: fix opacity bug

examples/js/shaders/UnpackDepthRGBAShader.js

@@ -40,7 +40,7 @@ THREE.UnpackDepthRGBAShader = {
 		"void main() {",
 
 			"float depth = 1.0 - unpackRGBAToDepth( texture2D( tDiffuse, vUv ) );",
-			"gl_FragColor = opacity * vec4( vec3( depth ), 1.0 );",
+			"gl_FragColor = vec4( vec3( depth ), opacity );",
 
 		"}"