asin and acos

turshija · Post by **turshija** » Sun May 18, 2008 6:04 pm

Wierd arcsin and arccos are not yet implemented ...

any trig function to get arcsin and arccos without it?
i need it for my new project ...

kattle87 · Post by **kattle87** » Sun May 18, 2008 9:07 pm

you have atan2: you have what you need

http://en.wikipedia.org/wiki/Inverse_tr ... alculation

read also the "Two argument variant of arctangent" snip.

However, a preprocessor feature would be GREAT!
Something like the ansi-C DEFINE would help

turshija · Post by **turshija** » Sun May 18, 2008 9:43 pm

okay ...
i looked at that site, and im obviously too stupid

can you just write me what should I type to find asin and what to find acos in ZGE ?

kattle87 · Post by **kattle87** » Sun May 18, 2008 9:59 pm

maybe tomorrow i'll post! In the meantime, tell me what you would like to do...

turshija · Post by **turshija** » Mon May 19, 2008 3:59 pm

i want to make game with third person camera so basically I want something like this:

red circle in the middle is PlayerModel and α is the PlayerModel's rotation ...
I want to place camera behind the player and to follow him by setting the camera's position to M position with α rotation ...
but I don't know how to find M(x,y) ... I think it can be found like this:

Code: Select all

x = arccos(alfa+pi);
y = arcsin(alfa+pi);

but I'm not really sure, and I can't try it at all since I don't have arccos and arcsin functions