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Topic: (3D) - Rotating a point about an axis
Replies: 6   Last Post: Jan 14, 2000 5:56 PM

 Messages: [ Previous | Next ]
 Paul Richards Posts: 26 Registered: 12/12/04
Re: (3D) - Rotating a point about an axis
Posted: Jan 13, 2000 5:15 PM

"Zdislav V. Kovarik" wrote:
>
> In article <387E2370.3483E821@dunvegan1.demon.co.uk>,
> Paul Richards <pauldoo@dunvegan1.demon.co.uk> wrote:
> :Hi,
> :I'm writing a program but I've got stuck.
> :
> :I've got to rotate the point (a, b, c) around an axis which runs through
> :the point (d, e, f) and the origin. The point should be rotated around
> :this axis by the angle g. Does anyone know how to do this?
> :
> :I would also be greateful if you explained your final answer because I'm
> :only writing this program in order to learn.

[snip really complicated bit]

WHOOSH!!! That went way over my head. :)

I don't think I know enough math to understand that. Any chance you
could rewrite it in a simpler form? :)

maybe a bit like some sort of psudocode:

[this is utter crap but just so you get the idea]
num_a=a*b+e*f
num_b=<blah>*num_a*g
<blah>
.
.
.
x=<blah>
y=<blah>
z=<blah>

Where (x, y, z) would be the final point?

Sorry to be annoying but I really didn't understand what you had
written.
--
Paul Richards (Pauldoo) - http://www.pauldoo.co.uk

I've not run any Microsoft code for 48 days.

Date Subject Author
1/13/00 Paul Richards
1/13/00 Zdislav V. Kovarik
1/13/00 Paul Richards
1/13/00 Paul Richards
1/14/00 David Hartley
1/13/00 Pertti Lounesto
1/14/00 Paul Richards