[ghemical-devel] A stupid question

[Jean Bréfort]

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Le mar 17/02/2004 =C3=A0 12:30, Tommi Hassinen a =C3=A9crit :
> On Tue, 17 Feb 2004, Jean Br=C3=A9fort wrote:
>=20
> > Hi,
> >
> > I have not used a lot ghemical so far, but I plan to. I tried work with
> > all available versions,and have the same problem with all of them. When
> > I add an object (electrostatic plane, orbital or other) some calculus
> > occurs, but nothing is displayed (some times, atoms in the background
> > become somewhat darker).
>=20
> Hmmm... This is interesting, since in a few weeks I have got several
> questions like this. But the problem does not appear in my system.
>=20
> I think the problem is that many of the objects are rendered transparent,
> and this transparent rendering suddenly is not working now in some system=
s
> (althought the code has not been changed in a few years). I took an
> example molecule, and made an electrostatic plot with default settings,
> using the default command string (using the 1.01+ version):
>=20
> 	add plane esp rb1 138.0 1.0 50 1 0.75
>=20
> Here is what it looks like here:
>=20
> 	http://www.uku.fi/~thassine/other/Screenshot1.png
>=20
> As you can see from the screenshot, the plane object is transparent, and
> the colurs range from red-green-blue. All electrostatic plots should look
> more or less like this. If you wish to get a solid plot, you can modify
> the command string like this:
>=20
> 	add plane esp rb1 138.0 1.0 50 0 0.75
> 	                              ^^^
> That is, the two last values are the transparency flag (1=3Dtransparent) =
and
> the transparency (or "alpha") value (0.75 means the plane is 75% opaque,
> or in other words 25% transparent). Switching transparency off I get:
>=20
> 	http://www.uku.fi/~thassine/other/Screenshot2.png
>=20
> So now the atoms behind the plane are not seen, but please try this and
> see whether you can now see the plane.

Yes, I see it now, but I can't get it transparent whatever value I use
for the transparency if the flag is not 1 and when the transparency flag
is set to 1, I can only see it if the transparency is set to 1. This
might come from my hardware. I'll test on other machines at work to see
what happens.

> > Is it a configuration problem or something else? What do I miss?
>=20
> I'm not using any hardware acceleration in my work box, so it's
> software-only rendering. In my home box I have a matrox g400 with DRI
> hardware acceleration, but so far I have not seen problems there either.
> Both setups are debian "testing".
>=20
> But this really is already 2nd report of the same problem. That makes the
> configuration problem less probable. Perhaps there is a newly-introduced
> bug in libmesa or something like that? The plot rendering code is
> identical in all versions of ghemical, so I expect all versions behave th=
e
> same way.

They do behave the same way.

I think that it would be more easier to track problems if the command
interpreter was replaced by dialog boxes with clearly identified fields
(at least for newbies like me). May be I can help. Anyway, I'll study at
least some parts of the code to figure out how I can export structures
from GChemPaint to Ghemical (I'll do that probably within a few months).

Regards,

Jean



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