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Need help with blurring
show user profile  magarlick
Hey folks

Can I ask you to kindly take a look at this animation frame:

I am trying to apply a lens blur to this image in a very specific location: from the edge of the blue star outwards, just far enough to catch all the flary bits on the outside. These are a particle system, emanating from a hidden shape similar to that of the blue star.

The particles are naturally emitted in all directions, but you can only see those around the perimeter of the star. Those which are in front of the star are too transparent to show up. This is what I want. But if I then apply a lens blur to these particles, the rest of the star is blurred as well, because they are in front of it.

I assume there is a way to blur a very specific part of the image using either luminance or a map but neither seem to have any effect. I tried setting the blur luminance to, say, 0 to 20 (i.e. to me, that seems that only the darker bits of the particles will blur). Doesn't work. In fact no amount of changing the luminance values does anything. Only a range of 0 to 100 will give me any blur.

Can anybody shed any light, please?

Thanks a lot.


Mark Garlick Words and Pictures Ltd
read 424 times
2/24/2012 10:57:59 PM (last edit: 2/24/2012 10:57:59 PM)
show user profile  Mr_Stabby
you could try adding a second set of invisible particles that fly in any other direction than the camera and apply lens blur to them, afaik there is no way add a perpendicular/parallel shader to the blur's logic

PS! if that on the left is a quasar which implies a huge mofo galaxy, then wtf is that blob right next to it thats several times bigger? :p

read 414 times
2/24/2012 11:25:04 PM (last edit: 2/24/2012 11:26:29 PM)
show user profile  magarlick
Thanks. I came up with that solution myself, and it worked well. But it's a pain. The camera is moving all the time, so I have to animate the particle emitter so that it is always perpendicular to the camera and centred on the blue star.

The object on the right is a blue giant star. On the left in the middle of the disc is a neutron star or black hole, whose gravity distorts the blue giant and pulls it into a tear-drop shape. The gas pulled off swirls around the neutron star/black hole to form an accretion disc.

Thanks for the feedback. I am amazed this cannot be done more easily.

Mark Garlick Words and Pictures Ltd
read 412 times
2/24/2012 11:34:16 PM (last edit: 2/24/2012 11:34:16 PM)
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