Re: class implementation

[david herviou <herviou@...>]

Dolan, Ryanne Thomas (UMR-Student) wrote:

> Funny you say that, because I used my game engine to write a simple 3d shooter, and everything is implemented in Lua with the luaglut binding.  I certianly wouldn't argue with your assertion that Lua is slower than a compiled language, but writing a 3D game engine in Lua isn't that bad of an idea.  At least in my experience, the framerate of a game is influenced most by the geometry it is trying to render, not by the language in which it was written.  For example, my engine's framerate doesn't improve at all when I use LuaJIT, because in reality there isn't much Lua code being interpretted each frame.
>  
When using rendering technics there is a lot of geometrical computation 
done by the CPU (now lot of on  GPU) , for example the frustrum culling. 
Typically eight test are done to consider an object is in the field of 
view or not (bounding box checking). So eight tests (a minimum if you 
have hierarchical bounding box for an object) by the number of objects 
to render give a lot of numerical computation in which lua is not as 
fastest as a compiled language.
I think it is interresting to write a 3D game engine in lua if you rely 
on C-C++ extension to do the ''bottleneck routines'' as mentionned by kerry.
Moreover, I think there is a also good reasons for people writing 
"heavy" game engine sometimes wrote in assembler.
Cordially,
dh.

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