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Index › Programming Questions & Help › Syntax Questions › camera() and the up vector
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camera() and the up vector (Read 374 times)
disablek
camera() and the up vector
Apr 3rd, 2008, 12:16pm  
I've been trying to rationalise the up vector used in the calls to camera() and no matter how i do it, i can't seem to wrap my head around how to derive the up vector. Can someone tell me what and how to apply the up vector to the calls to camera()?
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JohnG
Re: camera() and the up vector
Reply #1 - Apr 3rd, 2008, 1:16pm  
I'm not quite sure what your problem is.

At a guess you know where you want your camera to be, and where you want it looking at? Do you have an idea of what you want "upwards" to be? The up-vector doesn't have to be at 90' to the "forwards" one, if you (say) just want Z to be upwards, you can just use 0,0,1 for your up vector (this will act funny if your looking at vector goes under the camera however)
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disablek
Re: camera() and the up vector
Reply #2 - Apr 3rd, 2008, 7:20pm  
Well it's like this, if i use an up vector of (0,-1,0), then y is positive upwards and x is positive leftwards. (0,1,0), y is positive downwards and x is positive rightwards.

i'm not familiar with camera matrices, so how is this vector applied to rotate the global axes?
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