Okay, here's the results including Warps PCM with 'extra compression'
turned on, and also with a POV mesh2 file.  By the way, I went hunting
around for a way to create mesh2 files without reason... Warps program
includes mesh2 output.

Strata StudioPro (.vis)         1.29M
3D Studio          (.3ds)        1.35M
TrueSpace         (.cob)        1.88M
Warps PCM      (.pcm)       2.51M     <====== with xtra compression
Imagine              (.iob)         2.64M
DirectX              (.x)            2.75M
Warps PCM      (.pcm)       3.12M     <====== without extra compression
POV mesh2       (.inc)         3.23M     <====== mesh2 from WinMeshComp
Renderman         (.rib)         3.64M
VRML               (.wrl)         4.67M
Wavefront          (.obj)         5.04M
Renderware       (.rwx)         5.54M
AutoCAD          (.dxf)          6.04M
Alias                   (.tri)           7.40M
OpenGL C code (.c)            7.68M
QuickDraw 3D   (.3dm)        8.13M
stereolithography (.stl)           11.8M
POV                   (.pov)        12.6M
Pro/E                  (.slp)          16.8M
Lightscape           (.lp)           19.1M

Pretty impressive... with the extra compression turned on, Warps PCM
file is one of the smallest in the list.

-Doug Eichenberg

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Doug Eichenberg <dou### [at] nlsnet> wrote:
: By the way, I went hunting
: around for a way to create mesh2 files without reason... Warps program
: includes mesh2 output.

  The current version has only a more or less experimental mesh2 output and
it may not be the most optimal possible (besides not supporting uv-mapping
and so on). The next version will have full support for reading and writing
mesh2s.

: Strata StudioPro (.vis)         1.29M
: 3D Studio          (.3ds)        1.35M
: TrueSpace         (.cob)        1.88M
: Warps PCM      (.pcm)       2.51M     <====== with xtra compression

: Pretty impressive... with the extra compression turned on, Warps PCM
: file is one of the smallest in the list.

  I suppose that those three with best compression use some binary format
and that's how they achieve the small size. The PCM format is just ASCII.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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And by the way, thanks for comparing the PCM format with all those other
formats. I have no way of doing this kind of comparison myself, so this was
more than interesting.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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Another btw: The extra compressed version could probably be a bit smaller
than that. When I coded the extra compression algorithm, I just used a lazy
algorithm that uses the first combination of triangles it finds. It could be
possible to search for a better combination of (adjacent) triangles by
searching more aggressively, but without optimizing this search in any way
it would take years. I think there could be some way of optimizing this search,
but I have been too lazy to think about it.
  Anyways, I think that the current algorithm is good enough.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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Have you tried Chisel on your VRML models? It reduced one of my big meshes
from 1180 KBytes to 260 KBytes.



"Doug Eichenberg" <dou### [at] nlsnet> wrote in message
news:3977d37c@news.povray.org...
> Okay, here's the results including Warps PCM with 'extra compression'
> turned on, and also with a POV mesh2 file.  By the way, I went hunting
> around for a way to create mesh2 files without reason... Warps program
> includes mesh2 output.
>
> Strata StudioPro (.vis)         1.29M
> 3D Studio          (.3ds)        1.35M
> TrueSpace         (.cob)        1.88M
> Warps PCM      (.pcm)       2.51M     <====== with xtra compression
> Imagine              (.iob)         2.64M
> DirectX              (.x)            2.75M
> Warps PCM      (.pcm)       3.12M     <====== without extra compression
> POV mesh2       (.inc)         3.23M     <====== mesh2 from WinMeshComp
> Renderman         (.rib)         3.64M
> VRML               (.wrl)         4.67M
> Wavefront          (.obj)         5.04M
> Renderware       (.rwx)         5.54M
> AutoCAD          (.dxf)          6.04M
> Alias                   (.tri)           7.40M
> OpenGL C code (.c)            7.68M
> QuickDraw 3D   (.3dm)        8.13M
> stereolithography (.stl)           11.8M
> POV                   (.pov)        12.6M
> Pro/E                  (.slp)          16.8M
> Lightscape           (.lp)           19.1M
>
> Pretty impressive... with the extra compression turned on, Warps PCM
> file is one of the smallest in the list.
>
> -Doug Eichenberg
>
>
>
>
>
>

Post a reply to this message

>   And by the way, thanks for comparing the PCM format with all those other
> formats. I have no way of doing this kind of comparison myself, so this
was
> more than interesting.

No problem!

- Doug Eichenberg

Post a reply to this message

>   Another btw: The extra compressed version could probably be a bit
smaller
> than that.
>   Anyways, I think that the current algorithm is good enough.

I think the results speak for themselves.

- Doug Eichenberg

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