Updated builds.

build/three.js

@@ -16333,11 +16333,8 @@
 
 				if ( boxMesh === undefined ) {
 
-					// Normalized box
-					// 1.1547 = (1,1,1).normalize() * 2.0
-
 					boxMesh = new Mesh(
-						new BoxBufferGeometry( 1.1547, 1.1547, 1.1547 ),
+						new BoxBufferGeometry( 1, 1, 1 ),
 						new ShaderMaterial( {
 							uniforms: ShaderLib.cube.uniforms,
 							vertexShader: ShaderLib.cube.vertexShader,
@@ -16345,6 +16342,7 @@
 							side: BackSide,
 							depthTest: true,
 							depthWrite: false,
+							polygonOffset: true,
 							fog: false
 						} )
 					);
@@ -16359,6 +16357,8 @@
 						this.matrixWorld.makeScale( scale, scale, scale );
 						this.matrixWorld.copyPosition( camera.matrixWorld );
 
+						this.material.polygonOffsetUnits = scale * 10;
+
 					};
 
 					geometries.update( boxMesh.geometry );
@@ -21868,6 +21868,8 @@
 			state.buffers.depth.setMask( true );
 			state.buffers.color.setMask( true );
 
+			state.setPolygonOffset( false );
+
 			if ( vr.enabled ) {
 
 				vr.submitFrame();

build/three.module.js

@@ -16327,11 +16327,8 @@ function WebGLBackground( renderer, state, geometries, premultipliedAlpha ) {
 
 			if ( boxMesh === undefined ) {
 
-				// Normalized box
-				// 1.1547 = (1,1,1).normalize() * 2.0
-
 				boxMesh = new Mesh(
-					new BoxBufferGeometry( 1.1547, 1.1547, 1.1547 ),
+					new BoxBufferGeometry( 1, 1, 1 ),
 					new ShaderMaterial( {
 						uniforms: ShaderLib.cube.uniforms,
 						vertexShader: ShaderLib.cube.vertexShader,
@@ -16339,6 +16336,7 @@ function WebGLBackground( renderer, state, geometries, premultipliedAlpha ) {
 						side: BackSide,
 						depthTest: true,
 						depthWrite: false,
+						polygonOffset: true,
 						fog: false
 					} )
 				);
@@ -16353,6 +16351,8 @@ function WebGLBackground( renderer, state, geometries, premultipliedAlpha ) {
 					this.matrixWorld.makeScale( scale, scale, scale );
 					this.matrixWorld.copyPosition( camera.matrixWorld );
 
+					this.material.polygonOffsetUnits = scale * 10;
+
 				};
 
 				geometries.update( boxMesh.geometry );
@@ -21862,6 +21862,8 @@ function WebGLRenderer( parameters ) {
 		state.buffers.depth.setMask( true );
 		state.buffers.color.setMask( true );
 
+		state.setPolygonOffset( false );
+
 		if ( vr.enabled ) {
 
 			vr.submitFrame();