This should do you
Simon
2008-10-19 11:25:05
This does not work, as I do not have angles; only the desired direction vector.
Edward Z. Yang
2008-10-19 11:28:12
You can work out the angles using basic trig...SOH CAH TOAIf you don't know your basic trig you shouldn't be moneying around with vectors...
Simon
2008-10-19 11:40:42
I know I can work the angles out, but that's extremely inefficient. It should be possible to figure out the matrix using only cross products.
Edward Z. Yang
2008-10-19 11:44:31
If you can't spell 'monkeying' then you shouldn't be monkeying around with English.
House MD
2008-10-19 11:52:13
+1
A:
The question there involves getting a rotation to a certain axis, whereas I'm concerned with getting a rotation matrix.
Gee, I wonder if you could turn convert one to the other?
BTW, your current solution of picking an arbitrary y axis and then reorthogonalising should work fine; it looks bugged though, or at least badly written. 'z_vec' is not a good variable-name for the y-axis. What's with the 'z,x,y' ordering, anyway?
If it still doesn't work, try making random changes until it does - transpose the matrix, negate vectors until you have an even number of sign errors, that kind of thing.
Also your tone of voice comes across as sort-of rude, given that you're asking strangers to spend their time helping you.
House MD
2008-10-19 11:52:20
The question there involves getting a rotation to a certain axis, whereas I'm concerned with getting a rotation matrix.
Edward Z. Yang
2008-10-19 11:54:17
See my comments on the above answer. Yes, I could do that, but I'd like to get the above implementation working.
Edward Z. Yang
2008-10-19 12:03:17
Sorry about that. I've been working for several hours on this, so I'm quite frustrated right now.
Edward Z. Yang
2008-10-19 12:16:28
NP. I trust that randomly flipping vectors did the trick? Gotta love graphics programming...
House MD
2008-10-19 12:21:29