a simple question on glTranslate

[godhand]

Hi, I have drawn a cube resting on a 3 dimensional rectangle and I want to use glTranslate to move the whole object(cube+rectangle) via keyboard presses, how do I make it so that the cube doesn't move and only the whole object moves? thanks.

[mikael_aronsson]

Hi !

You use glPushMatrix and glPopMatrix to do hierarchical transformations.

glPushMatrix();
transform entire object here
glPushMatrix();
transform before cube
render cube
glPopMatrix();
glPushMatrix();
transform before rectangle
render rectangle
glPopMatrix();
glPopMatrix();

This way you save do local transformations to modify a single triangle or whatever and also transform the entire shape if you want to.

Mikael

[godhand]

Hi, they moved uniformly for awhile but doesn't not always stay together when moving. For example, the cube would just be couple of points behind the rectange after a long movement down the plain.