How do you rotate an individual object and not the whole scene?

OpenGL OpenGL: Basic Coding
1

How do you rotate two objects independently? I have a 3d cube suspended above a floor. i want to rotate the cube and not the floor. I can’t get all the pushMatrix popmatrix, Modelview stuff to work right… Can someone tell me the the syntax for acheiving this effect? Thanks again!

2

//preparation before rendering

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//Set the view frustum(glfrustum or gluProjections
glMatrixMode(GL_MODELVIEW);
glLoadIdentity()

//Set the camera position

glPushMatrix();

//transformations
//Draw the floor

glPopMatrix();

glPushMatrix();

//transformations
// draw cube

glPopMatrix();

don’t forget, if you want to rotate and oject around it’s center you need to put the glRotate before the glTranslate

[This message has been edited by Gorg (edited 04-04-2000).]

3

Originally posted by Gorg:
[b]//preparation before rendering

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//Set the view frustum(glfrustum or gluProjections
glMatrixMode(GL_MODELVIEW);
glLoadIdentity()

I’m not sure I understand. What does translation have to do with my rotation?

//Set the camera position

glPushMatrix();

//transformations
//Draw the floor

glPopMatrix();

glPushMatrix();

//transformations
// draw cube

glPopMatrix();

don’t forget, if you want to rotate and oject around it’s center you need to put the glRotate before the glTranslate

[This message has been edited by Gorg (edited 04-04-2000).][/b]

4

If you don’t need to use translations, then don’t use them.