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| Geometry Wars / Neon Wars Explosion effect |
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Paul whoknows
Member #5,081
September 2004
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I opened this thread to talk about how the Geometry Wars' explosion effect is done. I have also included the name Neon Wars because Phipps' explosions are slightly different. I just started learning OpenGL using AllegroGL and I can think of some ways to implement it, but I really prefer to seek the advise of more experienced people, I know there are many in this forum! Since I am using AllegroGL, I would prefer to focuse in how to develop this effect using OpenGL or AllegroGL, however, OpenLayer or D3D ideas are also welcome. If you don't know what I am talking about, just watch at these videos: ____ "The unlimited potential has been replaced by the concrete reality of what I programmed today." - Jordan Mechner. |
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Jonatan Hedborg
Member #4,886
July 2004
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It looks like additively blended line particles. Some velocity dampening and fading graphical intensity with time. The "swirly" effect in geometry wars is probably a grid of points with spring constraints. The constraints are drawn with their graphical intensity being proportional to the difference from current length to the resting length (probably squared, for performance reasons). Also with additive blending. (I did a small demo a while back to try this effect... it looked pretty nice)
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Paul whoknows
Member #5,081
September 2004
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Quote: It looks like additively blended line particles. Some velocity dampening and fading graphical intensity with time. I was thinking just in pixels, but now that you metioned, yes! it seems that it is made using lines particles, I think I'll try this approach. Quote: (I did a small demo a while back to try this effect... it looked pretty nice)
Can I try it? ____ "The unlimited potential has been replaced by the concrete reality of what I programmed today." - Jordan Mechner. |
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Jonatan Hedborg
Member #4,886
July 2004
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I actually managed to find it. I rather hoped that I wouldn't, now I have to show the world this abomination :X It uses OpenLayer. There is an executable in there. The coding is probably quite horrible, with most of the logic in one big loop and whatnot... There are no comments (obviously Exercises for the reader: Make something that fires bullets. Make bullets "push" the poins. Make the lines change strength depending on length I think I might have some particle system test laying around also... Have fun
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Schyfis
Member #9,752
May 2008
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Abomination? You're kidding, right? ________________________________________________________________________________________________________ |
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Paul whoknows
Member #5,081
September 2004
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Jonatan, you did a really cool effect in your demo! it looks amazing and it runs really smoothly! I'll try to use some of these nice effects in my game as well, thanks! ____ "The unlimited potential has been replaced by the concrete reality of what I programmed today." - Jordan Mechner. |
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Timorg
Member #2,028
March 2002
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If someone could post the zlib1.dll it would be good, because if if I am going to get it from an untrustworthy source, it may as well be you people. ____________________________________________________________________________________________ |
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GullRaDriel
Member #3,861
September 2003
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"Code is like shit - it only smells if it is not yours" |
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lambik
Member #899
January 2001
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here you go |
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GullRaDriel
Member #3,861
September 2003
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I beat you lambik BTW, why your file is smaller than mine ? Perhaps from an obscure versionning... My dll claim to be version 1.2.3.2027. "Code is like shit - it only smells if it is not yours" |
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Timorg
Member #2,028
March 2002
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The program starts, then crashes. Edit: with either dll ____________________________________________________________________________________________ |
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lambik
Member #899
January 2001
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Gull tu bastarde: <- points at avatar [edit] I got my dll from the zlib.org page. Version 1.2.3.0 it seems. |
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GullRaDriel
Member #3,861
September 2003
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Works fine there. Allegro DLL conflict perhaps ? Edit: uploaded a full working version 7z'ipped with all dll inside. Here is what strings | grep -i dll gave to me: alleg42.dll "Code is like shit - it only smells if it is not yours" |
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Jonatan Hedborg
Member #4,886
July 2004
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Quote: Jonatan, you did a really cool effect in your demo! it looks amazing and it runs really smoothly! I'll try to use some of these nice effects in my game as well, thanks!
I'm glad that you liked it
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Timorg
Member #2,028
March 2002
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That worked, that is really really cool, now someone needs to make a compiz plugin that applies that to the gnome desktop. (I don't know what kde calls their compositor.) Edit: or if the ability to load an image, I could get drunk and play with it for hours. ____________________________________________________________________________________________ |
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GullRaDriel
Member #3,861
September 2003
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Timorg said: Edit: or if the ability to load an image, I could get drunk and play with it for hours. Seconded ! Thought I remember me drunk blocking on a dancing bear pluggin I had on winamp.... "Code is like shit - it only smells if it is not yours" |
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Jonatan Hedborg
Member #4,886
July 2004
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I seem to recall a dancing sexy Santa plug-in, but not a bear
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Thomas Fjellstrom
Member #476
June 2000
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Hmm, this could be tough to build And this is just strange: moose@natasha:~/build/fancyGrid$ g++ -c Constraint.cpp -I/usr/include/freetype2 Constraint.cpp:7: error: reference to 'Point' is ambiguous point.h:12: error: candidates are: class Point
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Jonatan Hedborg
Member #4,886
July 2004
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It's only OpenLayer. Granted, an older openlayer... With lots of dependencies That error is a bit odd yeah... It was a looong time since I looked at that code, but I would guess that freetype has a typedef Point somewhere? It should be possible to exclude freetype and use the internal font engine instead.
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Thomas Fjellstrom
Member #476
June 2000
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Except that it isn't showing the typedef in the error, normally it would. -- |
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Jonny Cook
Member #4,055
November 2003
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Very cool! For anyone who cares, I "ported" it to Allegro (it was really hard The face of a child can say it all, especially the mouth part of the face. |
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Jonatan Hedborg
Member #4,886
July 2004
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No additive blending EDIT: But it's good for those lazy bums who does not want to install OL
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Jeff Bernard
Member #6,698
December 2005
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Or for those of us that have OpenLayer installed, but all OpenLayer programs crash anyway. -- |
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Jonny Cook
Member #4,055
November 2003
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Quote:
No additive blending Yeah, you're right. This does look better. The face of a child can say it all, especially the mouth part of the face. |
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Neil Black
Member #7,867
October 2006
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I don't even know how to open .rar files. Google wants me to spend money on something to do it.
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).
so many dependencies 
).