RE: Color in StL

From: J.vandenHout@ind.tno.nl
Date: Mon Nov 20 2000 - 12:19:09 EET


At TNO we do use the same format. However, I don't think we can talk about
a standard on colour yet:

We are currently working on texturemapping on models for Colour RP. A
slightly different version of STL can be used to make this possible, while
this STL file will still remain valid for the old-fashioned black/white
world. We will try to finish some sort of demoversion of the software for
the Euromold 2000.

It's our opinion that Colour RP will grow mature when texture-mapping (like
company logo's) is possible.

                Jeroen van den Hout
                TNO Institute of Industrial Technology
                Production Development Division
                Department of Industrial Prototyping
                P.O.Box 5073
                2600 GB Delft
                The Netherlands
                Tel:+31-15-2608747 / +31 6 55514510
                Fax:+31-15-2608725

Visit us at:
http://www.ind.tno.nl/en/productiondevelopment/prototyping/index.html
<http://www.tno.nl/instit/indus/prototyping/index.html>

        -----Oorspronkelijk bericht-----
        Van: Marshall Burns [SMTP:Marshall@Ennex.com]
        Verzonden: vrijdag 17 november 2000 18:03
        Aan: Marcus Joppe; rp-ml@bart.lpt.fi
        Onderwerp: Color in StL

        Marcus,

            Thank you for posting that. I followed van der Geest's posts
with great
        interest, but I didn't notice him posting that information. Perhaps
I missed
        it. It would be of interest to hear from the folks at TNO and
Materialize
        whether they are conforming to that specification. If both of them
are, then
        I will take that as a standard color extension and add it to our Web
page on
        the StL spec. It would also be helpful to know if TNO and
Materialize are
        using any particular name to refer to the extended spec and what
file
        extension they are using for files that use it (".StL" or something
else?).

        Best regards,
        Marshall Burns
        President, Ennex Corporation

        Marshall@Ennex.com
        Los Angeles, USA, (310) 397-1314
        http://www.Ennex.com

        ----- Original Message -----
        From: "Marcus Joppe" <mjoppe@marcam.de>
        To: <rp-ml@bart.lpt.fi>
        Sent: Friday, November 17, 2000 09:29
        Subject: Re: stl files

> Marshall,
>
> an extension for the STL format to use colour information has
already been
> published to the rp-ml from Aad van der Geest one year ago.
> We are using this extension within our new RP software VisCAM RP
which
        will be
> shown on the Euromold 2000 in Frankfurt and released in the first
quarter
        of
> next year. I'm not sure, but I think other software vendors are
using the
        colour
> extension in the same way.
>
> Following is the extension of the STL format from Aad van der
Geest:
>
> For every triangle the colour information is in the attribute
count (16
        bits).
> bit 15 always 1 (to distinguish from normal stl files)
> bit 10 to 14 intensity level for red (0 to 31)
> bit 5 to 9 intensity level for green (0 to 31)
> bit 0 to 4 intensity level for blue (0 to 31)
> In this way there are 32768 different colours.
>
> --
> Best regards
> Marcus Joppe
>
> -----------------------------------------------------
> Marcam Engineering BIBA Gebaeude
> Marcus Joppe Hochschulring 20
> 28359 Bremen
> Tel.: +49 (0)421/218-5633
> Fax: +49 (0)421/218-5633
> eMail: mjoppe@marcam.de Mobil: +49 (0)170/751-8801
> -----------------------------------------------------
>

        For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/

For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/



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