Rotating Cubes

OpenGL OpenGL: Basic Coding
1

Hello,

I am new to opengl and I am trying to draw rotating cubes that move in circular path using glTranslatef, and glRotatef.
I can’t seem to get to it o work…the cubes only rotate in their position and I can’t get them to move. What is the procedure that I have to follow in order to make that happen? thank you

2

This will be easier if you post the code that isn’t working.

3

//this is the cube that should be fixed in the center
glLoadIdentity();
glRotatef(angle++, 0, 1, 0);
cube.drawMesh();

	//this cube should move in circular path around the first one
	glTranslatef(0,0,0); 
	glRotatef(angle++, 1, 0, 0);
	glTranslatef(0, 3, 0);
	glRotatef(angle++, 1, 0, 0);
	cube.drawMesh();

the second one just moves half a circle

4

The above call does nothing.

Bear in mind that all matrix operations except glLoadIdentity() and glLoadMatrix() are cumulative, i.e. they compose a specified transformation with the current transformation. A call to glTranslate() with zero offsets composes an identity matrix, i.e. it leaves the current transformation unchanged.

In any case, to make an object “orbit” a point, the sequence is: rotate, translate, then draw. If you’re going to be drawing anything else which isn’t orbiting along with that object, you’d want the rotation and translation between glPushMatrix() and glPopMatrix().