Incremental Rotation

Incremental Rotation, in Eye Space

To rotate the model around Eye-Space axis :
vertex = DeltaR x M x vertex,
i.e. R = DeltaR x R


					
						glMatrixMode(GL_TEXTURE);
					

					
						glLoadIdentity()*;
					

					

					
						glMatrixMode(GL_PROJECTION);
					

					
						glLoadIdentity()*;
					

					
						glFrustum
					/
					
						glOrtho(l,r,b,t,n,f);
					

					

					
						glMatrixMode(GL_MODELVIEW);
					

					
						glLoadIdentity()*;
					

					

					
						glTranslatef( 0., 0., -distance );
					

					

					
						glPushMatrix();
					
						
							glLoadIdentity();
						

						
							glRotatef(delta_x, 1., 0., 0.);
						

						
							glMultMatrix( R );
						

						
							glGetFloatv(GL_MODELVIEW_MATRIX,R);
					
					
						glPopMatrix();
					

					

					
						glTranslatef(+ctr.x, +ctr.y, +ctr.z);
					

					
						glMultMatrixf( R );
					

					
						glTranslatef(-ctr.x, -ctr.y, -ctr.z);
					

					

					
						glVertex3fv(vcoord[i]);