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Hi,
I've been lurking on this forum last autumn, I thought I should at last post the result :
A ray tracing renderer with one light source, phong shading, full movement around the mandelbulb,
automatic level of detail (depending on distance to object). You can also change the power (negative and positive).

About 0.8 seconds per image on my GeForce 9800GT.

An image :

A video : http://kyrlian.free.fr/binaries/cudafractal/rotate_zoom.avi

Sources with visual C project (for win):
http://kyrlian.free.fr/binaries/cudafractal/fractal3d_win_src_20091207.zip

Sources with makefile (for *nix):
http://kyrlian.free.fr/binaries/cudafractal/fractal3d_linux_src_20091206.zip

To compile and run, you'll need a Nvidia card, latest nvidia drivers, toolkit and sdk from http://www.nvidia.com/object/cuda_get.html
Algorithm comes from various posts in this forum (http://www.fractalforums.com/3d-fractal-generation/true-3d-mandlebrot-type-fractal/?action=printpage), cuda code from NVidia samples in the cuda toolkit.

usage (for azerty kb, change in opengls.cu):
z, q, s, d : move
e, c : strafe up-down

r, v : zoom in-out

i, j, k, l : rotate view around origin
4, 5, 6, 8 : look around
g, h  : rotate light around view vertical axis
w, W : decrease, increase maxiter
f : toggle full screen (you can also resize the window as usual)
o : print position
u : print (this) usage
a : quit

Thanks for the ride,
k.

Thanks also from my side. With your code, i've a starting point to play around with CUDA on NVIDIA and the mandelbulb stuff.

~300ms on my GeForce GTX 280
edit: ~100ms with blocksize set to 16 in cuda_draw.cu
 
My fare away target would be to improve the speed of http://www.fractalforums.com/mandelbulb-software/mandelbulber-open-source-program-for-rendering-high-quality-mandelbulbs/, with supporting NVIDIA GPU's.

But for that, i've a long way to go. The only thing i can in the moment is C-Programming (C++ is a bit rosty) and i like the mandelbulb images a lot ;-)

Regards,

Daniel