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Dark GDK / LookAt Vector

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aersixb9
16
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Joined: 29th Nov 2007
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Posted: 10th Dec 2007 00:28
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How do I get a lookAt vector from a camera? I can get the camera's 3 angles (in degrees)...how do I convert this into a (unit) vector pointed in the right direction? Do I need EZRotate to do this? Will EZRotate do this? Or is there a way to do this for free?
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Zotoaster
19
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Joined: 20th Dec 2004
Location: Scotland
Posted: 10th Dec 2007 01:05
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vec.x = dbSin( ang.y ) * dbCos( ang.x );
vec.y = - dbCos( ang.x );
vec.z = dbCos( ang.y ) * dbCos( ang.x );

"It's like floating a boat on a liquid that I don't know, but I'm quite happy to drink it if I'm thirsty enough" - Me being a good programmer but sucking at computers
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aersixb9
16
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Joined: 29th Nov 2007
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Posted: 10th Dec 2007 01:44
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It doesn't work...here's the code...the ship still doesn't accelerate right...did I type something in wrong?

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Morcilla
21
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Joined: 1st Dec 2002
Location: Spain
Posted: 10th Dec 2007 11:36
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I think you should use the 'dbPickScreen' function... It generates that vector.
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Zotoaster
19
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Joined: 20th Dec 2004
Location: Scotland
Posted: 10th Dec 2007 16:14
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Oops, the Y vector should be -sbSin( ang.x ), my bad

"It's like floating a boat on a liquid that I don't know, but I'm quite happy to drink it if I'm thirsty enough" - Me being a good programmer but sucking at computers
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aersixb9
16
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Joined: 29th Nov 2007
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Posted: 10th Dec 2007 16:49
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Well, I tried replacing the Y vector with -dbSin(xang), but that didn't work either...so I tried using dbPickScreen and dbGetPickVectorX-Z, and it works like a charm! I love you both. Here's a haiku dedicated to spatial gaming in dark GDK:

Flying between the
Planets earth and Moon for fun
you forum guys are great!

Anyways, here's the final, working code, if it's of use to anyone!



You can use this code for a newtonian physics based solar system simulator! Just load up models for earth, sun, and moon, initialize x,y,z,xvel,yvel,zvel, and acceleration to reasonable values, and start playing!
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The Mayflower
16
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Joined: 17th Dec 2007
Location: Plymouth, Massachusetts
Posted: 18th Dec 2007 00:54
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Erm....

dbPointCamera()

DOH!
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