I'm trying to make a Bokeh background like this:enter image description here

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.enter image description here And here is the render. enter image description here As you can see, this method doesn't work. What does?

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    $\begingroup$ Yes you can do it. Here is a tutorial, sorry I don't have time to write the answer up vimeo.com/28353103 The aperture shape must be at the right distance to the lens and the camera clipping needs to accommodate the distance to the lamp $\endgroup$ – 3pointedit Mar 1 '19 at 3:52
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    $\begingroup$ You can make it work with a shape in frot of the lens. Make the shape smaller. blender.stackexchange.com/questions/74527/… $\endgroup$ – cegaton Mar 1 '19 at 4:03
  • $\begingroup$ Although this method is useful from an educational point of view, it's not the more efficient. You can do it in compositing with the Bokeh Blur node associated with a Bokeh Image node ( docs.blender.org/manual/en/dev/compositing/types/filter/… ) $\endgroup$ – thibsert Mar 1 '19 at 21:16

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