Chapter 13. Selection and Feedback. OpenGL Programming Guide Third Edition Presented by Jung Lee. Chapter Objectives. Select a region of the screen Pick an object drawn on the screen Use the OpenGL feedback mode To obtain the results of rendering calculations. Interactive Applications.
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OpenGL Programming Guide Third Edition
Presented by Jung Lee
glPushMatrix(); /* save the current transformation state */
/* create your desired viewing volume here */
glPopMatrix(); /* restore the previous transformation state */
gluPerspective, glOrtho, gluOrtho2D, or glFrustum
/* draw scene for picking ; perform picking */