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


Running a Demo Script:

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

	../src/mesawish 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.


simpledemo.tcl
	
	A very simple application - draws a triangle. Begginners 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.
	(NOTE: you may have to edit this script if Tcl/Tk demo dir is not
	/usr/local/lib/tk4.0/demos/).