Merge pull request #16561 from fernandojsg/fixvr

Fix WebVR viewport size when presenting

src/renderers/webvr/WebVRManager.js

@@ -69,16 +69,16 @@ function WebVRManager( renderer ) {
 		if ( isPresenting() ) {
 
 			var eyeParameters = device.getEyeParameters( 'left' );
-			renderWidth = eyeParameters.renderWidth * framebufferScaleFactor;
+			renderWidth = 2 * eyeParameters.renderWidth * framebufferScaleFactor;
 			renderHeight = eyeParameters.renderHeight * framebufferScaleFactor;
 
 			currentPixelRatio = renderer.getPixelRatio();
 			renderer.getSize( currentSize );
 
-			renderer.setDrawingBufferSize( renderWidth * 2, renderHeight, 1 );
+			renderer.setDrawingBufferSize( renderWidth, renderHeight, 1 );
 
-			cameraL.viewport.set( 0, 0, renderWidth, renderHeight );
-			cameraR.viewport.set( renderWidth, 0, renderWidth, renderHeight );
+			cameraL.viewport.set( 0, 0, renderWidth / 2, renderHeight );
+			cameraR.viewport.set( renderWidth / 2, 0, renderWidth / 2, renderHeight );
 
 			animation.start();