POV-Ray : Newsgroups : povray.programming : Parsing mesh2 data : Re: Parsing mesh2 data Server Time
21 Sep 2021 14:03:03 EDT (-0400)
  Re: Parsing mesh2 data  
From: Le Forgeron
Date: 14 Sep 2016 03:46:26
Message: <57d90052$1@news.povray.org>
Le 14/09/2016 à 08:39, scott a écrit :
>> Fun fact:
>>
>> Trying to read obj files directly turns out to be only marginally faster
>> than parsing mesh2 data (about 3% as it seems).
>
> I thought obj files had an ascii and binary version, but I was wrong.
> That seems to be stl files. Maybe the binary stl format is faster to read?
>
> https://en.wikipedia.org/wiki/STL_(file_format)
>
You can give it a try in hgpovray (there is a stl_load and stl_save )

https://github.com/LeForgeron/povray/wiki/Tesselation

The main issue with povray mesh import is the unique indexing of 
vectors: when the data structure is not like mesh2, each new component 
need to perform a search in previous values.

Even the parsing of a mesh get slowed down as the number of triangles 
increased. Fast for 100, Normal when reaching 10 000, crawling after 1 
000 000.

Mesh2 avoid the search because the uniqueness is done before (by the 
generator of mesh2).


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