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Re: Help thinking through a blur problem...



Blur is a fairly expensive operation, and render in image is pretty heavy as well. I would recommend checking out this example of using core image:
/Developer/Examples/Quartz Composer/Core Image Compositions/Star Shine.qtz

That composition isn't exactly what you're looking for, but should point you in the right direction.

On May 10, 2006, at 8:47 AM, Nathanial Ziarek wrote:

Hi all -

I fairly certain that what I want to do it easy as sin, but I can't figure out how to do it in such a way that it runs smoothly on any machine I have (including a Quad G5/nvidia 6600)...

I am basically looking to create an effect similar to "Aurora Borealis." My idea was just to create a particle patch, motion blur it, and have the particles change colors. I can create that composition and it looks and runs fine in the small viewer. However, the second you crank up the size at all, it slows to a crawl.

As I am not very proficient at QC, and I had experimented a lot with different things, I assumed I had done something goofy half way through and decided to start over, testing at each step to see where the slow down is coming from.

This time, I made an image patch containing a clear and a particle generator with 50 particles connected to a sprite. Works fine at all sizes. I then ran the image through a gaussian blur before the sprite and once again I get a complete slow down.

So, if I am doing something wrong, I would love for someone to enlighten me. However, it is my guess that this is just not the way to accomplish what I want, and I was hoping that someone might be able to help me get to the "proper" way of doing things.

Thanks,

Nate
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References: 
 >Help thinking through a blur problem... (From: Nathanial Ziarek <email@hidden>)



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