TKOGL DEMO SCRIPTS
==================


Running a Demo Script on Unix-based systems:

Just execute your TKOGL extended wish (glwish) with
the script as a parameter. For example, if you have just compiled
glwish in the 'src' directory, you should be able to run, say,
nurbsdemo.tcl with

	../src/mesawish nurbsdemo.tcl

Running a Demo Script in Windows 95 or Windows-NT:

The best way to run a Tcl script in Windows 95 is to double-click the
tcl file from within the Explorer. If you have not yet associated the
.tcl filetype with wish41, this might be a good time to do it -- when
the explorer pops up a dialog box asking you which application should
be used to open the file, choose wish41 and check the "Always use
this program to open this file". If you do not wish to do this, you
can always use the "Run" entry in the "Start" menu: Assuming that
the Tcl/Tk distribution was installed in "C:\Tcl" and that
the demo directory is in c:\tkogl\demo, you should use
the following command line to run nurbsdemo.tcl:

	c:\tcl\bin\wish41.exe c:\tkogl\demo\nurbsdemo.tcl

Notes about the demos:

accumdemo.tcl

	Shows the use of the accumulation buffer to blend two spheres

bezcurvedemo.tcl

	Renders a cubic Bezier curve. Control points can be dragged with 
	mouse button 1

bezsurfdemo.tcl

	Renders a cubic Bezier surface patch. Dragging Button 1 rotates
	the surface. Clicking Button 2 toggles between line display and
	fill display.

fogdemo.tcl

	Renders three colored spheres with fog. The radio buttons and
	scales control some of the OpenGL fog rendering parameters.

gencyldemo.tcl

	Demonstrates some of the capabilities of the Generic Cylinder
	extension. The radio buttons select different surface types.
	The edit check button opens a popup window for inspecting
	or changing the parameters of the surface type currently selected.
	Mouse button 1 can be used to rotate the surface.

nurbsdemo.tcl

	Demonstrates some uses of the nurbssurface command. Renders
	a surface patch defined by a 4x4 control point mesh. The
	radio buttons let you experiment with parameters such as 
	the knot distributions, the polynomial order, etc. Dragging
	mouse button 1 rotates the surface.

pickdemo.tcl

	Demonstrates the select widget command by allowing picking and 
	dragging the vertices of a wireframe with mouse button 2. Dragging
	button 1 performs rotation.

quadricdemo.tcl

	Demonstrates how to use the various options of the cylinder, 
	sphere, disk and partialdisk widget commands. Dragging button 1
	rotates the model.

polydemo.tcl
	
	Draws the 5 platonic polyhedra and variations thereof. Also
	demonstrates how to use the stencil buffer to draw wireframes
      over filled polygons.

simpledemo.tcl
	
	A very simple application - draws a triangle. Beginners should
	start by browsing this source.

tessdemo.tcl

	Demonstrates the use of the tesselate widget command. Draws a 
	square with a square hole. Button 1 toggles between line and
	fill modes.

texturedemo.tcl

	Demonstrates OpenGL texture mapping. Two textures can be selected
	by radio buttons: a checkerboard image generated by the script
	itself and the teapot image (teapot.ppm) of the Tcl/Tk
	distribution.