Hi Adri,
Two methods for 3D rendered fences (seen with Lightworks):
1) In AC-12, Go to Options, Element Attributes, Materials, Create a new Lightworks material. Make sure the Lightworks Render Engine is selected. Go to the color class and choose the Graphisoft wrapped image shader, insert a photo of the fence you want. You have play with the scale of the image to match the scale of the wall (height) correctly, and then apply that material to a wall, and the wall becomes your fence.
2) If you want to see through the gaps between the boards you need to use the billboard technique. This involves the use of the graphisoft masked image shader instead of the wrapped image, both in the Color section.
Mark