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Index › Programming Questions & Help › OpenGL and 3D Libraries › Change position of axis of a box
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Change position of axis of a box (Read 585 times)
TVS
Change position of axis of a box
Feb 19th, 2009, 2:48pm  
I am creating several boxes, but instead of having the axis of the box in the center, I want it to lie in the middle of one of the surfaces of the box.

Is this possible, and if so, how?

Thanks in advance!
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Jonathan_Feinberg
Re: Change position of axis of a box
Reply #1 - Feb 21st, 2009, 7:22pm  
I'm not sure what your question means. Do you mean that you wish to animate the rotation of the box around an axis that lies on one of the cube's surfaces?

In general you'll need to learn how to use the translate() and rotate() functions to transform the coordinate space before drawing. The reference has some sample code for that kind of thing.
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TVS
Re: Change position of axis of a box
Reply #2 - Feb 25th, 2009, 4:57pm  
No, that is not what I mean. I know how rotate() and translate() work.

Let me try to explain in better:
When a box is created in OPENGL (with box(...)) the center is the 'base-point': when rotate() or translate() is performed, it is done around this point.
But I want this point to lie on a surface (in this case the bottom), so that when I for instance translate, it is done according to the surface, instead of the center of the box...

More clear?
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