===============================================================================
 * Copyright 1996, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED
 *
 * UNPUBLISHED -- Rights reserved under the copyright laws of the United
 * States.   Use of a copyright notice is precautionary only and does not
 * imply publication or disclosure.
 *
 * U.S. GOVERNMENT RESTRICTED RIGHTS LEGEND:
 * Use, duplication or disclosure by the Government is subject to restrictions
 * as set forth in FAR 52.227.19(c)(2) or subparagraph (c)(1)(ii) of the Rights
 * in Technical Data and Computer Software clause at DFARS 252.227-7013 and/or
 * in similar or successor clauses in the FAR, or the DOD or NASA FAR
 * Supplement.  Contractor/manufacturer is Silicon Graphics, Inc.,
 * 2011 N. Shoreline Blvd. Mountain View, CA 94039-7311.
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without
 * fee, provided that (i) the above copyright notices and this
 * permission notice appear in all copies of the software and related
 * documentation, and (ii) the name of Silicon Graphics may not be
 * used in any advertising or publicity relating to the software
 * without the specific, prior written permission of Silicon Graphics.
 *
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR ANY SPECIAL,
 * INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY
 * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY
 * THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE
 * OR PERFORMANCE OF THIS SOFTWARE.
===============================================================================

This is the Impact demo of (fake) clipmapping
that was used at the Performer class at the Developers' Forum in May '96.

Requirements:
    - Impact (much preferably with 4 trams)
    - IRIX6.2 with patch 1333
    - If you want to compile it, you'll need Performer 2.1
      (a compiled static version of the program is provided).

Instructions:
    Run /usr/demos/bin/buttonfly in this directory.
    Select any of the four buttons (they are all the same program
    with different imagery).

    Use the mouse to move the scene around.

    Play with all of the widgets in the clump on the lower left.

    Note that when the clip centering mode is set to "Auto", the clip center
    (region of highest resolution) follows the eye, i.e.
    it is always the point on the square closest to the eye.
    The "Mouse Drag" mode of centering is inoperative.

To compile the source (requires Performer 2.1):
	cd src/fakeclipfly
	make oglopt