Introduction:

This tutorial builds upon tutorials 2 and 4 to create external rockwall corners.

Create two small rockwalls at 90° to each other.

Create another cube in the corner and use two point clipping to halve it so that it has a triangular cross-section in the xy plane.

Now three point clipping can be used to cut the corner brush into two brushes with triangular visible faces. Select the corner brush and place three clip points at the three corners then switch to xz view. Move the first point to the top of the brush and the third point to the bottom. Keep the second point in the centre.

The corner set can now be copied and pasted to create a wall of the desired height. Then irregularites can be introduced through vertex manipulation as with previous rockwall tutorials.

Both internal and external rockwall corners are used in the example map below. The second screenshot shows the external corner shown in the Radiant screenshots above.