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Simple Rotation Problem :/

Started by MyCatIsTheBest Jan 28, 2006 at 12:53 PM 6 replies 1.2k views

Original Post

MyCatIsTheBest

Jan 28, 2006 at 12:53 PM

Fixed [Edited by - MyCatIsTheBest on January 29, 2006 4:21:29 PM]

BlueHabu

Jan 28, 2006 at 4:46 PM

Translate to the orgin do your rotation then translate back to the object's orginal position

glTrans
glRot
glTrans

wyled

Jan 28, 2006 at 5:36 PM

More specifically you need to translate to the center of the object.

glTranslate(obj.width/2, obj.height/2, obj.depth/2)
glRotatef(roty, 0, 1, 0);
glColor3f(0, 0, 1);
glCallList(dList);
glPopMatrix();

wyled

Jan 28, 2006 at 6:02 PM

Can you post what dList contains? The problem could be in there.

BlueHabu

Jan 29, 2006 at 12:16 AM

From your code
Quad[4][3][2] = 0 + loc[2] + width;

Completely off topic but why is there a 0 here. I am just curious if there is a reason for this I am not aware of.

not 100% but try this

trans(-loc[0], -loc[1], -loc[2])
rot
trans(loc[0], loc[1], loc[2])

or LoadIndentiy after push matrix

ff8

Jan 29, 2006 at 12:48 AM

or try this
glTranslate*(objx,objy,objz);
glPushMatrix();
glLoadIdentity();
glRotate*();
drawobj();
glPopMatrix();

AAAP

Jan 29, 2006 at 12:32 PM

theres 2 things that i know of that cause this.

1. the objects in your matrix arent centered.

or

2. you perform a rotation before translation.

the former would look more "orbity" though.

BlueHabu

Jan 29, 2006 at 10:32 PM

Is there a reason you can't tell us the solution to your problem

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