Hmm, now it works. I hadn't even changed anything. ...were the "alien overlords" passing overheard before, disrupting my computer? Must've been. Hmph.
Anyway, I guess you can't create 3D fractals in UF very easily then? I guess that's one advantage ChaosPro has over UF: If you write out your formula in terms of quaternions, it can handle the 3D slicing and projection for you. Ah well. I tried looking through your WIP, but I could only make a toe of it. No head nor tail.
My formulas aren't known for their ease of reading (including by me) - I have a strong tendency to optimise rather than write for clarity - including what doesn't really need optimising - also I tend to omit comments
Basically the global: sets up all the variables that are fixed for the entire render such as the view transformation, the light source array data etc.
Then the int: section is where the ray-tracing takes place.
The loop: section simply sends the required data to the colouring that's required to render the fractal.
UF gives you your 2D coords on a rectangle as #pixel and I basically use this rectangle as an image plane which is at a user specified distance from the user specified target and at user specified angles - the viewpoint being a user specified distance further from the target through the centre of the image plane.
So in the init: section the #pixel value is transformed to give our direction vector for the ray through the current pixel then we simply ray-trace from where this ray crosses the user specified front clipping plane.
The ray-tracing loop actually operates in up to 6 different states - calculate at current step on ray, calculate at current step+delta and calculate (at one step position only but maybe at step and at step+delta) for each of the 4 adjacent rays (for getting the normal at the found solid).
I hope that helps
December 09, 2006, 11:38:14 PM
3d mandelbrot
Selfmade
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