*/\r
void mouse(int button, int state, int x, int y) {\r
if ( glutGetModifiers() == GLUT_ACTIVE_SHIFT ) {\r
- button = GLUT_MIDDLE_BUTTON;\r
+ button = GLUT_MIDDLE_BUTTON; // Holding shift is the same as the middle button\r
}\r
switch(button) {\r
case GLUT_LEFT_BUTTON:\r