Re: New Tutorials ! [updt:2011/03/29: geometry shader cubes]

madmarx · Post by **madmarx** » Mon Mar 28, 2011 11:03 pm

Hello everyone,

The geometry shader to generate 1 cube per vertex, allowing thousands of moving cubes is ready (300000 animated cubes in the scene). More precisely, it was ready 3 or 4 months ago, and I release it now.

Next to come : what do you prefer ? a few simpler shader tutorials first, or more brutal shader examples ?

Also I made a new 3D model for my tutorial instead of the ogrehead. Don't expect it to be special, it is simply lighter to download.

Have fun!

Pierre

PolyVox · Post by **PolyVox** » Tue Mar 29, 2011 12:13 am

Very cool! With the 300000 cubes I get about 60FPS on my machine (GTX 280).

I wonder whether it's posible to use this with a particle system, to have cubic particles? I guess Ogre outputs quads rather than individual points so it might not be trivial. Plus rotation could be a complication.

Anyway, great work

Post by **Kojack** » Tue Mar 29, 2011 4:19 am

I guess Ogre outputs quads rather than individual points so it might not be trivial.

Ogre's particle system can use point sprites instead of manual quads, so it already can output individual points.

madmarx · Post by **madmarx** » Tue Mar 29, 2011 12:27 pm

With the 300000 cubes I get about 60FPS on my machine (GTX 280).

Well vsync is enabled in the program, so you can't go faster than 60FPS (on most devices) until you desactivate it

.
Still this is not 'that' performant, comparing to voxels technique.

I don't think adding rotation would be a problem (ex: using the normal, or the secondary color).
I also made a version of it that project only 7 vertices of the cube, and create only the 3 visible faces (so there is less fillrate, less transformation etc..). But as it relies on array iteration in the shader, it is in the end slower than this simple shader, even if there are fewer float operations.

Baesky · Post by **Baesky** » Thu Feb 23, 2012 3:37 am

Could i translate them to chinese？

madmarx · Post by **madmarx** » Thu Feb 23, 2012 10:13 pm

Thank you for your comment!

I have a lot more, but I did not took time to upload them (notably many about shader), as they sometime require external libraries (xpressiv). As I changed job and town recently, I need some time before I go back to publishing those.

lilin · Post by **lilin** » Tue Mar 27, 2012 7:51 am

Many thanks Madmax, it was very helpful !

madmarx · Post by **madmarx** » Wed Apr 11, 2012 10:51 pm

@Baeski

could I translate them to chinese ?

=> YES

! It is my wish! Currently the 10 first tutorial are written in both French and English, there is 1 txt file per language that contains all the translation for each language.
So if you translate that txt file, all the wiki page and all the cpp files with comments are then generated.
I can provide you with the tools I created (on windows) to automatically generate the comment from the txt file, which allows to make all the translation much quickier. I have not tested it with "complicated" signs like chinese so maybe a test with a single sentence in chinese could be a good beginning to check if that work. If not, I can upgrade my tools to make them support it.

@lilin
Thank you !