Improve frustum culling performance (#27219)

Author: gkjohnson

src/objects/BatchedMesh.js

@@ -948,19 +948,15 @@ class BatchedMesh extends Mesh {
 
 				if ( visibility[ i ] ) {
 
+					// get the bounds in world space
 					this.getMatrixAt( i, _matrix );
 					this.getBoundingSphereAt( i, _sphere ).applyMatrix4( _matrix );
 
 					// determine whether the batched geometry is within the frustum
 					let culled = false;
 					if ( perObjectFrustumCulled ) {
 
-						// get the bounds in camera space
-						this.getMatrixAt( i, _matrix );
-
-						// get the bounds
-						this.getBoundingBoxAt( i, _box ).applyMatrix4( _matrix );
-						culled = ! _frustum.intersectsBox( _box ) || ! _frustum.intersectsSphere( _sphere );
+						culled = ! _frustum.intersectsSphere( _sphere );
 
 					}
 
@@ -1001,13 +997,10 @@ class BatchedMesh extends Mesh {
 					let culled = false;
 					if ( perObjectFrustumCulled ) {
 
-						// get the bounds in camera space
+						// get the bounds in world space
 						this.getMatrixAt( i, _matrix );
-
-						// get the bounds
-						this.getBoundingBoxAt( i, _box ).applyMatrix4( _matrix );
 						this.getBoundingSphereAt( i, _sphere ).applyMatrix4( _matrix );
-						culled = ! _frustum.intersectsBox( _box ) || ! _frustum.intersectsSphere( _sphere );
+						culled = ! _frustum.intersectsSphere( _sphere );
 
 					}