copyTextureToTexture3D exclusive aligned xyz (#28154)

src/renderers/WebGLRenderer.js

@@ -2414,9 +2414,9 @@ class WebGLRenderer {
 
 		this.copyTextureToTexture3D = function ( sourceBox, position, srcTexture, dstTexture, level = 0 ) {
 
-			const width = Math.round( sourceBox.max.x - sourceBox.min.x );
-			const height = Math.round( sourceBox.max.y - sourceBox.min.y );
-			const depth = sourceBox.max.z - sourceBox.min.z + 1;
+			const width = sourceBox.max.x - sourceBox.min.x;
+			const height = sourceBox.max.y - sourceBox.min.y;
+			const depth = sourceBox.max.z - sourceBox.min.z;
 			const glFormat = utils.convert( dstTexture.format );
 			const glType = utils.convert( dstTexture.type );
 			let glTarget;