Provided by: xscreensaver-gl-extra_4.23-4ubuntu8_i386 bug


       glforestfire  -  draws  a  GL  animation  of  sprinkling  fire-like  3D


       glforestfire [-display host:display.screen] [-window] [-root]  [-visual
       visual]  [-delay  microseconds]  [-count  number_of_particles]  [-trees
       number_of_trees]   [-size   viewport_size]   [-texture]   [-no-texture]
       [-shadows]  [-no-shadows] [-fog] [-no-fog] [-wireframe] [-no-wireframe]
       [-wander] [-no-wander] [-trackmouse] [-no-trackmouse] [-fps] [-no-fps]


       The glforestfire program draws an animation of sprinkling fire-like  3D
       triangles in a landscape filled with trees.


       glforestfire accepts the following options:

       -window Draw on a newly-created window.  This is the default.

       -root   Draw on the root window.

               Install a private colormap for the window.

       -visual visual
               Specify  which  visual  to use.  Legal values are the name of a
               visual class, or the id number (decimal or hex) of  a  specific

       -fps    Display a running tally of how many frames per second are being
               rendered.  In conjunction with -delay 0, this can be  a  useful
               benchmark of your GL performance.

       -trees number_of_trees
               Specify how much trees are drawn in the landscape.

       -count number_of_particles
               Specify  how much fire particles are drawn. A very special case
               is 0 wich means that you get rain !

       -size viewport_size
               Viewport of GL scene is specified size if greater than  32  and
               less   than  screensize.  Default  value  is  0,  meaning  full

               Show a textured ground and the trees. This is the default.

               Disables texturing the landscape. This implies  that  no  trees
               are drawn.

               Show  a  shadow  for  each  particle on the ground. This is the

               Disables the drawing of the shadows.

       -fog    Show a fog in the distance.

       -no-fog Disables the fog. This is the default.

       -wander Move the observer around the landscape. This is the default.

               Keep the fire centered on the screen.

               Let the  mouse  be  a  joystick  to  change  the  view  of  the
               landscape.  This implies -no-wander.

               Disables mouse tracking. This is the default.

       -wire   Draw  a wireframe rendition of the fire: this will consist only
               of single-pixel lines for the triangles.


       DISPLAY to get the default host and display number.

               to get the name of a resource file that  overrides  the  global
               resources stored in the RESOURCE_MANAGER property.


       X(1), xscreensaver(1)


       Copyright  ©  2001  by Eric Lassauge.  Permission to use, copy, modify,
       distribute, and sell  this  software  and  its  documentation  for  any
       purpose  is  hereby  granted  without  fee,  provided  that  the  above
       copyright notice appear in all copies  and  that  both  that  copyright
       notice  and  this permission notice appear in supporting documentation.
       No representations are made about the suitability of this software  for
       any  purpose.   It  is  provided  "as  is"  without  express or implied

       The original code for  this  hack  was  written  by  David  Bucciarelli
       (  and  could  be  found  in  the demo package of Mesa
       (Mesa-3.2/3Dfx/demos/). This hack is the result of the merge of two  of
       the David’s demos (fire and rain).


       David       Bucciarelli      <>      Eric      Lassauge