Exporters: Support alternative working color spaces (#29472)

examples/jsm/exporters/DRACOExporter.js

@@ -1,4 +1,4 @@
-import { Color } from 'three';
+import { Color, ColorManagement, SRGBColorSpace } from 'three';
 
 /**
  * Export draco compressed files from threejs geometry objects.
@@ -227,7 +227,9 @@ function createVertexColorSRGBArray( attribute ) {
 
 	for ( let i = 0, il = count; i < il; i ++ ) {
 
-		_color.fromBufferAttribute( attribute, i ).convertLinearToSRGB();
+		_color.fromBufferAttribute( attribute, i );
+
+		ColorManagement.fromWorkingColorSpace( _color, SRGBColorSpace );
 
 		array[ i * itemSize ] = _color.r;
 		array[ i * itemSize + 1 ] = _color.g;

examples/jsm/exporters/OBJExporter.js

@@ -1,6 +1,8 @@
 import {
 	Color,
+	ColorManagement,
 	Matrix3,
+	SRGBColorSpace,
 	Vector2,
 	Vector3
 } from 'three';
@@ -226,7 +228,9 @@ class OBJExporter {
 
 					if ( colors !== undefined ) {
 
-						color.fromBufferAttribute( colors, i ).convertLinearToSRGB();
+						color.fromBufferAttribute( colors, i );
+
+						ColorManagement.fromWorkingColorSpace( color, SRGBColorSpace );
 
 						output += ' ' + color.r + ' ' + color.g + ' ' + color.b;
 

examples/jsm/exporters/PLYExporter.js

@@ -1,7 +1,9 @@
 import {
 	Matrix3,
 	Vector3,
-	Color
+	Color,
+	ColorManagement,
+	SRGBColorSpace
 } from 'three';
 
 /**
@@ -302,9 +304,9 @@ class PLYExporter {
 
 						if ( colors != null ) {
 
-							tempColor
-								.fromBufferAttribute( colors, i )
-								.convertLinearToSRGB();
+							tempColor.fromBufferAttribute( colors, i );
+
+							ColorManagement.fromWorkingColorSpace( tempColor, SRGBColorSpace );
 
 							output.setUint8( vOffset, Math.floor( tempColor.r * 255 ) );
 							vOffset += 1;
@@ -461,9 +463,9 @@ class PLYExporter {
 
 						if ( colors != null ) {
 
-							tempColor
-								.fromBufferAttribute( colors, i )
-								.convertLinearToSRGB();
+							tempColor.fromBufferAttribute( colors, i );
+
+							ColorManagement.fromWorkingColorSpace( tempColor, SRGBColorSpace );
 
 							line += ' ' +
 								Math.floor( tempColor.r * 255 ) + ' ' +