Thats really freaking lovely! Great to see you here, it looks really
nice man, awesome work (as always). I need to get that orbit trap QC
plugin out. Do you want the code? Im happy to share what Ive got, and
where I was taking it. Anyway, thats great great stuff.
On Sep 21, 2009, at 7:29 PM, Tom Beddard wrote:
Hi folks. I've been lurking here for a while after but I thought it
was time to introduce myself and contribute something.
I have an interest in mathematical and generative graphics and over
the past while I've created a few GPU shaders for Adobe Pixel Bender
for use in Photoshop and After Effects. After Vade got me interested
in Quartz Composer I've started converting some of these over to QC
compositions.
My first contribution is a GLSL port of Keenan Crane's Cg
quarternion Julia set ray tracer. It's pretty much a straight port
to a GLSL patch but QC makes it so easy to play around with the
parameters and hook it into other stuff.
The one thing I did add was support for an approximate ambient
occlusion addition to the shading of the 3D surface. It's actually
derived from a by-product of the ray tracing process so adds almost
no overhead to the final computation, but adds a nice visual
improvement.
I've posted full details about the QC patch along with the Pixel
Bender version (for high res rendering in Photoshop CS4) over on my
blog: http://www.subblue.com/blog/2009/9/20/quaternion_julia
Also attached the QC composition:
<QuaternionJulia.qtz>
I also just noticed that there is an OpenCL version now too:
http://developer.apple.com/mac/library/samplecode/OpenCL_RayTraced_Quaternion_Julia-Set_Example/index.html
Cheers
T.
--
Tom Beddard
http://www.subblue.com
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