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3d point rotation (Read 1338 times)
marquete
3d point rotation
Sep 3rd, 2005, 12:37am  
Hi again!

I was plotting some objects with vertex() after writing a cinema 4d file importer. When i tried rotating the object using rotateZ() it did not work.
Someone succeed?
I guess i'll have to try matrix multiplication, sure it'll work but will decrease the computer speed.

Matrix multiplication or did someone succeed using rotateX() with vertex()?

Thanx all Smiley G'nite.
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fry
Re: 3d point rotation
Reply #1 - Sep 3rd, 2005, 12:54pm  
unfortunately you can't mix vertex() (or anything inside beginShape/endShape) with calls to rotate() and friends:
http://processing.org/reference/beginShape_.html

if you need to rotate you can use sin() and cos() to get rotated points.. for instance this will give you rotateZ():

float xx = (x - centerX) * cos(angle);
float yy = (y - centerY) * sin(angle);

or something like that (yy may need to be set negative or something.. i haven't tested this). centerX and centerY are the center point used for the rotation.
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marquete
Re: 3d point rotation
Reply #2 - Sep 3rd, 2005, 11:10pm  
I haven't tested that, but it worked fine with matrix multiplication.

Thanx fry
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