Rotate orthographic projection scene

OpenGL Development JOGL Development
#1

I realize this is a rather basic question, but I’ve been struggling with this for a bit…

I have a scene I’m creating with orthographic projection:


gl.glOrtho(0.0f, 100.0f, 0.0f, 100.0f, -1.0f, 1.0f);

I’m trying to rotate the scene 90 deg. counterclockwise using ‘gluLookat()’. I can rotate the scene using ‘glTranslate()’ and ‘glRotate()’, but I’m thinking ‘gluLookat()’ would be better. Here’s what I have working.


gl.glTranslatef(100.0f, 0.0f, 0.0f);
gl.glRotatef(90, 0, 0, 1);

For the life of me I cannot get anything with ‘gluLookat()’ working. The basic (non-rotated) call to ‘gluLookat()’ is:


glu.gluLookAt(
    0.0f, 0.0f, 0.0f,		// eye X,Y,Z
    0.0f, 0.0f, -1.0f,		// center X,Y,Z
    0.0f, 1.0f, 0.0f);		// up X,Y,Z

I can get the scene rotated correctly by specifying ‘1.0f, 0.0f, 0.0f’ as the last three parameters, but I can’t get the scene translated to the right and image is clipped off…

Thanks!

#2

I figured this out (with some help from some friends). After rotating (e., setting the last three parameters to ‘1.0, 0.0, 0.0’, ‘up’ is now the X axis so I need to move the eye and camera in the Y axis 100 units. The final call to do a 90 deg. counterclockwise rotation is:


glu.gluLookAt(
    0.0f, 100.0f, 0.0f,		// eye X,Y,Z
    0.0f, 100.0f, -1.0f,	// center X,Y,Z
    1.0f, 0.0f, 0.0f);		// up X,Y,Z