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09.27.2007 at 06:50AM PDT, ID: 22856599
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Attachment Details

Rotating an OpenGL primitive around its centre

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7.4
I am rendering OpenGL primitives on a Java Canvas but using C to call OpenGL functions.
I can display a primitive shape eg a box in the centre (axis 0,0,0) and when i rotate it, it rotates around the axis i.e. (0,0,0). I now translate the box in the X axis say (1,0,0), the box is now displayed at that position, when i rotate it, the box rotates around the axis with the translation in x.
What I want to do is after i have translated the box (1,0,0) I want to select the box and then rotate around the centre of the Box and not the axis, thus if i had several primitives and i clicked one of them, the rotation point shouldl be from the centre point of that primitive and all the other primitives move in relation to this.
Answered By: ikework
Expert Since: 05/23/2003
Accepted Solutions: 552
Computer Expertise: Advanced
ikework has been an Expert for 5 years 7 months, during which he has posted 2738 comments and answered 552 questions. ikework is just one of 71 experts in the OpenGL Graphics & Game Programming Zone. 3 experts collaborated on this answer, which was graded an "A" by the asker.
 
 
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