Re: [Visualpython-users] povexport of vpython materials

[Jasper S. <jas...@gm...>]

Absolutely, it's fairly straight forward to add a pov_finish and pov_color
tags in a way similar to the pov_texture. I can add those easily enough.
It'll add to the code repetition in all the export_ functions though. I
think some code refactoring would make the module cleaner, more transparent.
But who has the time for that, right?

Jasper


On Wed, May 18, 2011 at 4:20 AM, Bruce Sherwood <Bru...@nc...>wrote:

> No, you're probably not missing anything. I'll comment that Ruth
> Chabay is currently deeply involved in an unrelated project, so it's
> not clear when she will work on updating povexport. Moreover, her main
> priorities are just dealing with the objects currently not supported,
> especially faces, text, and extrusion.
>
> Note however that povexport is not a very large program, and written
> in pure Python, so if you have a clear vision of how it should be
> improved to deal with the attributes of interest to you, I encourage
> you to consider improving povexport yourself.
>
> Bruce Sherwood
>
> On Mon, May 16, 2011 at 5:16 AM, Jasper Stolte <jas...@gm...>
> wrote:
> > Bruce, thank you for your prompt reply.
> >
> > Indeed, I noticed the support for (among others) woods and metals through
> > the .inc files. However, I believe these materials are purely texture
> based.
> > It seems to me povexport only does pov_texture, as I cannot find
> something
> > for pov_finish or pov_color. For example, it is not quite clear to me why
> we
> > would include colors.inc, since I dont think you can use its color
> > definitions through the pov_texture variable anyway. Similarly, as far as
> I
> > can see, from the metals.inc only the textures can be used, not the
> colors
> > or the finishes. The wood example only works because wood only requires
> > texture, and no finish or color. There is no example that uses the
> > colors/finishes from the metals.inc or colors.inc macros, and as far as I
> > can see they cannot be used without modifying povexport to support them
> > first.
> >
> > Or maybe I am just completely missing something.. :)
> > Kind regards,
> >
> > Jasper
> >
> >
> > On Sun, May 15, 2011 at 10:27 PM, Bruce Sherwood <
> Bru...@nc...>
> > wrote:
> >>
> >> There is some support for materials, as indicated in the header to the
> >> 2009 version of povexport, available in the contributed section of
> >> vpython.org:
> >>
> >> This module exports a VPython scene as POV-Ray scene description code.
> >> Lights and camera location from the current visual scene are included.
> >> Optionally, you may specify a list of include files,
> >>   and pov textures for objects.
> >> For an example of its use, see 'povexample.py'.
> >> Currently convex, faces, and points objects are not exported.
> >> Further documentation is found at the start of the file.
> >>
> >> Also see the example program povexample_wood.py, which is included in
> >> the 2009 povexport package.
> >>
> >> The relatively recent objects "text" and "extrusion" are not handled
> >> by povexport. Ruth Chabay, the originator of povexport, intends to
> >> bring povexport up to date. The "create_faces()" method for extrusion
> >> objects was created to make it feasible to export an extrusion to
> >> povexport (and the text object creates an extrusion, so it too should
> >> prove to be exportable).
> >>
> >> Bruce Sherwood
> >>
> >> On Sun, May 15, 2011 at 6:28 AM, Jasper Stolte <jas...@gm...>
> >> wrote:
> >> > Hi guys,
> >> >
> >> > It's been a few years since I used vpython, but I'm happy to see there
> >> > is
> >> > still activity and development of this useful tool. For my new project
> >> > I'm
> >> > using povexport, which exports the scenes nicely into pov-ray format.
> >> > However when I look at the resulting pictures the material information
> >> > seems
> >> > lost. Everything ends up looking like I selected materials.diffuse for
> >> > it.
> >> >
> >> > Digging into the documentation I found that pov-ray uses a 'finish'
> tag
> >> > to
> >> > specify things such as reflectivity etc. Tweaking the finish tag
> >> > parameters
> >> > manually I quickly rendered something which was looking at least
> >> > acceptable.
> >> > Now my question is whether you guys have experience mapping the
> vpython
> >> > materials to the pov-ray finish tag, and if you would be willing to
> >> > share
> >> > parameters? Maybe someone has even started improving the povexport
> >> > module to
> >> > include the finish tag?
> >> >
> >> > Kind regards,
> >> > Jasper
> >>
>
>
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