I've got the Bokeh in blender with a particle system copying a sphere that has an emission modifier. I'm using the depth of field to blur out the spheres. This creates a simple bokeh effect. I can increase the blade value to get triangles, squares, pentagons, etc. but that doesn't get complex shapes. in a normal camera, i'd put a piece of card with a shaped hole in it to make that shape appear on all the bokeh. That doesn't seem to work in blender. here is my attempt with a cross. And here is the render. As you can see, this method doesn't work. What does?