3D trigonometry help

[fractower]

I reversed the identities in my original post. They should have been  (|X cross M| = XM sin(ang)) and (X dot M = XM cos(ang)). You want to use the dot product version since it gives an unambiguous result between 0 and pi (0 and 180).

ang = acos ((X dot M)/XM)  where XM is actually |X||M|.

Since X is known in advance, you can set its length to 1 when you start.

[Kali]

Ok, I did it, and if I did it right, the results are dissapointing 

Mandelbrot is a flat wheel, as hobold expected, and julias are something like quaternions, only worse.
It's not worth posting pictures   
Also the DE is not working very good with this, too much noise!

So the quest continues... thanks anyway for your help, guys 

[DarkBeam]

Ok, I did it, and if I did it right, the results are dissapointing 

Mandelbrot is a flat wheel, as hobold expected, and julias are something like quaternions, only worse.
It's not worth posting pictures   
Also the DE is not working very good with this, too much noise!

So the quest continues... thanks anyway for your help, guys 

To do the de you must derive your functions, don't ask me how... that's why I never used Fragmentarium

[DarkBeam]

And this page comes handy I guess:

http://en.wikipedia.org/wiki/Trigonometric_identity