Processing 1.0 - Processing Discourse - Registration point (translate?) w/ beginShape()

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Index › Programming Questions & Help › OpenGL and 3D Libraries › Registration point (translate) w/ beginShape()

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Registration point (translate?) w/ beginShape() (Read 440 times)

redblind

Registration point (translate?) w/ beginShape()
Dec 22^nd, 2008, 10:06pm

I come from a Flash AS3 and PV3D background, so please excuse my lack of correct jargon.

I'm playing around with the SpaceJunk OpenGL example. When each cube is created it is building the cube off center to position the cube. So, when you rotate the cube it rotates the cube according to a point that is the center of the view.

I would like to rotate the cube on it's own axis. I am thinking i need to move the registration point or something. Can someone point me in the right direction?

Thanks!

pelintra

Re: Registration point (translate?) w/ beginShape(
Reply #1 - Dec 27^th, 2008, 8:02pm

hi.
the registration point is allways the (0,0,0)
so for example if you want to rotate a shape around its own axis you need to draw it centered at (0,0,0), translate it to the desired position and then rotate the shape.
here's some pseudo code

Code:


pushMatrix();
translate(positionX, positionY, positionZ);
rotateX(rotX);
rotateY(rotY);
rotateZ(rotZ);
beginShape(POLYGON);
//draw shape centered at (0,0,0)
endShape();
popMatrix();

hope that helps

redblind YaBB Newbies Offline Posts: 2	Re: Registration point (translate?) w/ beginShape( Reply #2 - Jan 6^th, 2009, 1:09am Thanks very much! That helped.

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