Hello

I'm actually working on a 3d particle system, drawn with OpenGl and texturing.

I apply a rotation on the X axis of the whole system with the following code (simplified):

pgl.beginGL();
gl.glTranslatef(width/2,height/2,100);
gl.glRotatef(rotateX, 1.0f, 0.0f, 0.0f);
system.draw();
pgl.endGL()

As I want each particles not to be rotated, I add the negative value to the rotation for each particles on the X-axis:

gl.glEnable( GL.GL_TEXTURE_2D );
pgl.bindTexture( particleTexture );
gl.glPushMatrix();
...
gl.glRotatef(-rotateX, 1.0f, 0.0f, 0.0f);
...
gl.glPopMatrix();
gl.glDisable( GL.GL_TEXTURE_2D );

It works fine in this case, the faces of the particles are not rotated.
But when I add a rotation on an other axis of the system :

gl.glRotatef(rotateX, 1.0f, 0.0f, 0.0f);
gl.glRotatef(rotateY, 1.0f, 1.0f, 0.0f);
system.draw();

and then...

gl.glPushMatrix();
...
gl.glRotatef(-rotateX, 1.0f, 0.0f, 0.0f);
gl.glRotatef(-rotateY, 0.0f, 1.0f, 0.0f);
...
gl.glPopMatrix();

.. . this method don't seems to be the good one.
Do you have any idea to keep the system's rotation and "invalidate" the particles'one?

Thanks

Great !!!!

Thank you very much John.