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GTC is a C library for making networked 3d interactive applications.
So far, the only really good part is this. You give it a
scene graph (see below) and it will make sure that all
clients connected to the server have a synchronized copy of the scene
graph. For instance, you could have a scene being a maze with people
shooting and all the projectiles, with the clients being players wanting
to see where they are. Networking is handled for you, the encoding is
compact.
Also present is a small library to do global collision detection. Given
a list of bounding boxes, it checks all pairs of bounding boxes for
collision. The algorithm attempts to run faster than
O(n2)
by using a form of pruning. In the future, scripting language bindings
will be added.
What's a scene graph?
In brief, it's a description of a 3d world. In the example game, the
scene graph is a list of spaceships with their positions. When a ship
fires, a new object is added to the scene graph (the projectile). When
a ship or a projectile gets destroyed, it is removed from the scene
graph.
For a more verbose explanation, please see the
overview. Note that
I worded it for suits.
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Sorry, I know they're a bit dark.
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CVS (Sat Jan 15 2000)
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Similar Projects
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MPEG-4
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I worked on this.
I haven't seen an implementation yet.
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PLib
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has a scene
graph library, OpenGL widget set and more.
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Crystal
Space
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a very
large effort which appears to be quite succesful.
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SDL
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a very low
level library that opens windows, draws pixels, sound, networking
and soon OpenGL for you in Win and Linux.
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GTS
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a geometry library for
a couple of good things, including collision detection.
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Verse
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extremely super
similar project.
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Developer Tools
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System Libraries
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Modellers, Sound & Misc
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0.0
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Original annoucement on freshmeat with pre-release code.
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0.1
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First release with demo shooter. Fri Jul 9 19:43:34 EDT 1999
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0.2
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Convert to new metagfx code, network the shooter. Mon Jul 19 13:51:48 EDT 1999
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0.3
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Texturing, better networking, some real meshes. I can load
.asc files and .ale files. Added support for "resource repository".
Wed Sep 1 16:31:50 EDT 1999
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0.4
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More structured network protocol. Also reduced
bandwidth requirements. Added AI to the sample game. Sun Nov 28 15:41:14 EST 1999
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0.5
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This time for real, need to add 2d to the scene graph. Thu Dec 23 03:48:03 EST 1999
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0.6
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Cleaned up stuff. Added a starfield. Added rendering contexts,
you can now do things like turn off the Z-buffer or backface culling or lighting... License change to GPL. Tue Jan 4 13:50:52 EST 2000
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0.7
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Minor bugfix for people without . in their path.
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0.8
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Initial SDL support, initial multithreading, better
make install, configuration file support.
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Clean up stuff? Add better .ase loading for Jussi's very cool mesh.
Add viewports. Add font rendering (maybe)
and text boxes. Add streaming sound. Convert to use
SDL.
Make a CORBA interface. Add a search path for resource files.
Well, this may not all make it into 0.8 but...
I've been playing with SDL. It turns out that SDL's threading
support is very lacking. I've been talking to Sam but according to what
he's told me so far, he still has problems with servicing an event loop
in one thread and doing gfx in another in win32.
I discovered a win32 implementation of
pthreads.
The Windows implementation is
here.
While this gives some hope for the win32 situation with GTC, the
problem isn't solved yet.
I am very busy right now with my thesis. In April, I plan to resume
work on GTC and turn it into my income source. Stay tuned.
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