Re: [Visualpython-users] vpython and my application

[Bruce S. <bas...@un...>]

Currently there is no way to display an image in VPython. The online=20
reference manual is complete; if you don't find a feature there it=20
doesn't exist.

However, some features may not be noticed at first. For example, you can=20
change the origin programmatically. In the help section on "Controlling=20
windows" you will see that you can programmatically change scene.center=20
and scene.forward to change what part of the scene the "camera" is=20
looking at and from what direction.

Also, see the demo program stonehenge.py for an example of moving=20
through the scene rather than merely rotating around the scene.

As for the quality of the image, note that at http://vpython.org there=20
is "A module by Ruth Chabay to export a VPython scene to POV-Ray".=20
POV-Ray is a freeware utility that produces photo-quality "ray-traced"=20
images, something that is not possible in real time with VPython.

Putting this all together, here is a possible scheme that might do what=20
you need:

1) Produce the 3D image you want in VPython, using the Chabay module to=20
export a scene-description file in POV-Ray format.

2) Install POV-ray and use it to produce a photo-quality image.

3) Use some tool such as PhotoShop to merge this image with your=20
background image.

There is not a good way built into VPython for printing images directly;=20
you have to do screen prints. It is possible that among the abundant=20
Python tools for image processing and printing it is possible to=20
automate this, but I for one don't know how.

Bruce Sherwood

Rachel.Vaudron wrote:
>  Hi,
>=20
> after having payed with the demos and tried to use vpython with my prog=
rams, I
> think that it's very powerful but I'm not sure that is the best tool fo=
r
> my application, I hope you could help me to choose...
>=20
> I have to display 3D objets in an orthonormal system and complete this
> with an axis and a grid. For these things, I think that vpython is good.
> But, I have to put a background image behind my graph and the result mu=
st
> look nice when being printed on very large paper sizes (e.g. A0), so a
> screenshot is probably not good enough.
>=20
> Do you know if with vpython it is possible :
>      * to put a background image in the frame
>      * to change the origin programmatically
>      * to zoom programmatically
>      * to find a system to print easily ?
>=20
> I have studied the reference documentation but I haven't find more doc.
> Could you say me where I could find some?
>=20
> Thaks a lot for your reply.
>=20
> Rachel
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> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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> Rachel Vaudron
> Laboratoire d=E9partemental de pr=E9histoire du Lazaret
> 33 bis bd franck Pilatte 06300 Nice
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D
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