remove gamma "correction" on non-texture shader parameters per discussion here: https://github.com/mrdoob/three.js/issues/5838 examples are not yet updated.

src/renderers/WebGLRenderer.js

@@ -4523,15 +4523,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 		uniforms.opacity.value = material.opacity;
 
-		if ( _this.gammaInput ) {
-
-			uniforms.diffuse.value.copyGammaToLinear( material.color, _this.gammaFactor );
-
-		} else {
-
-			uniforms.diffuse.value = material.color;
-
-		}
+		uniforms.diffuse.value = material.color;
 
 		uniforms.map.value = material.map;
 		uniforms.lightMap.value = material.lightMap;
@@ -4595,17 +4587,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 		uniforms.envMap.value = material.envMap;
 		uniforms.flipEnvMap.value = ( material.envMap instanceof THREE.WebGLRenderTargetCube ) ? 1 : - 1;
 
-		if ( _this.gammaInput ) {
-
-			//uniforms.reflectivity.value = material.reflectivity * material.reflectivity;
-			uniforms.reflectivity.value = material.reflectivity;
-
-		} else {
-
-			uniforms.reflectivity.value = material.reflectivity;
-
-		}
-
+		uniforms.reflectivity.value = material.reflectivity;
 		uniforms.refractionRatio.value = material.refractionRatio;
 
 	}
@@ -4657,20 +4639,9 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 		uniforms.shininess.value = material.shininess;
 
-		if ( _this.gammaInput ) {
-
-			uniforms.ambient.value.copyGammaToLinear( material.ambient, _this.gammaFactor );
-			uniforms.emissive.value.copyGammaToLinear( material.emissive, _this.gammaFactor );
-			uniforms.specular.value.copyGammaToLinear( material.specular, _this.gammaFactor );
-
-
-		} else {
-
-			uniforms.ambient.value = material.ambient;
-			uniforms.emissive.value = material.emissive;
-			uniforms.specular.value = material.specular;
-
-		}
+		uniforms.ambient.value = material.ambient;
+		uniforms.emissive.value = material.emissive;
+		uniforms.specular.value = material.specular;
 
 		if ( material.wrapAround ) {
 
@@ -4682,17 +4653,8 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 	function refreshUniformsLambert ( uniforms, material ) {
 
-		if ( _this.gammaInput ) {
-
-			uniforms.ambient.value.copyGammaToLinear( material.ambient, _this.gammaFactor );
-			uniforms.emissive.value.copyGammaToLinear( material.emissive, _this.gammaFactor );
-
-		} else {
-
-			uniforms.ambient.value = material.ambient;
-			uniforms.emissive.value = material.emissive;
-
-		}
+		uniforms.ambient.value = material.ambient;
+		uniforms.emissive.value = material.emissive;
 
 		if ( material.wrapAround ) {
 
@@ -5157,16 +5119,6 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 	}
 
-	//
-
-	function setColorGamma( array, offset, color, intensity, gammaFactor ) {
-
-		array[ offset ]     = Math.pow( color.r * intensity, gammaFactor );
-		array[ offset + 1 ] = Math.pow( color.g * intensity, gammaFactor );
-		array[ offset + 2 ] = Math.pow( color.b * intensity, gammaFactor );
-
-	}
-
 	function setColorLinear( array, offset, color, intensity ) {
 
 		array[ offset ]     = color.r * intensity;
@@ -5233,19 +5185,9 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 				if ( ! light.visible ) continue;
 
-				if ( _this.gammaInput ) {
-
-					r += Math.pow( color.r, _this.gammaFactor );
-					g += Math.pow( color.g, _this.gammaFactor );
-					b += Math.pow( color.b, _this.gammaFactor );
-
-				} else {
-
-					r += color.r;
-					g += color.g;
-					b += color.b;
-
-				}
+				r += color.r;
+				g += color.g;
+				b += color.b;
 
 			} else if ( light instanceof THREE.DirectionalLight ) {
 
@@ -5264,15 +5206,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 				dirPositions[ dirOffset + 1 ] = _direction.y;
 				dirPositions[ dirOffset + 2 ] = _direction.z;
 
-				if ( _this.gammaInput ) {
-
-					setColorGamma( dirColors, dirOffset, color, intensity, _this.gammaFactor );
-
-				} else {
-
-					setColorLinear( dirColors, dirOffset, color, intensity );
-
-				}
+				setColorLinear( dirColors, dirOffset, color, intensity );
 
 				dirLength += 1;
 
@@ -5284,15 +5218,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 				pointOffset = pointLength * 3;
 
-				if ( _this.gammaInput ) {
-
-					setColorGamma( pointColors, pointOffset, color, intensity, _this.gammaFactor );
-
-				} else {
-
-					setColorLinear( pointColors, pointOffset, color, intensity );
-
-				}
+				setColorLinear( pointColors, pointOffset, color, intensity );
 
 				_vector3.setFromMatrixPosition( light.matrixWorld );
 
@@ -5312,15 +5238,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 				spotOffset = spotLength * 3;
 
-				if ( _this.gammaInput ) {
-
-					setColorGamma( spotColors, spotOffset, color, intensity, _this.gammaFactor );
-
-				} else {
-
-					setColorLinear( spotColors, spotOffset, color, intensity );
-
-				}
+				setColorLinear( spotColors, spotOffset, color, intensity );
 
 				_direction.setFromMatrixPosition( light.matrixWorld );
 
@@ -5361,17 +5279,8 @@ THREE.WebGLRenderer = function ( parameters ) {
 				skyColor = light.color;
 				groundColor = light.groundColor;
 
-				if ( _this.gammaInput ) {
-
-					setColorGamma( hemiSkyColors, hemiOffset, skyColor, intensity, _this.gammaFactor );
-					setColorGamma( hemiGroundColors, hemiOffset, groundColor, intensity, _this.gammaFactor );
-
-				} else {
-
-					setColorLinear( hemiSkyColors, hemiOffset, skyColor, intensity );
-					setColorLinear( hemiGroundColors, hemiOffset, groundColor, intensity );
-
-				}
+				setColorLinear( hemiSkyColors, hemiOffset, skyColor, intensity );
+				setColorLinear( hemiGroundColors, hemiOffset, groundColor, intensity );
 
 				hemiLength += 1;