[chimera-dev] Re: working at home

[Greg Couch]

I have already had extensive talks with Tom Goddard about why the jaggies
are there and there is alreadys an entry in the gnats database.
Normally, I try to not burden the email list with these details and keep
them in the gnats database, but to summerize:

Without hardware multisampling/supersampling (which chimera uses if it is
available), you'll always have jaggies for cylinders, spheres, and
surfaces.  It is just more noticable if you have a white background
because of how the primitives are shaded (dark on the sides).  The
solution for printing, is to supersample, that is to generate an image
that is 16 times larger and average 16 pixels into one (9x might be
sufficient).  Regular grid supersampling will work for molecular modeling
images (instead of the jittered sampling that ribbonjr uses) because there
are extremely few right angles (so there is almost no chance that the
"picket fence" effect of primitives appearing and disappearing from one
frame to the next).

	Greg

On Wed, 14 May 2003, Tom Ferrin wrote:

> Okay, but please respond to Tom Goddard's email (w/ cc to chimera-dev)
> about jaggies in Chimera images.
>
> --tom
>
>
> --------
> > Forgot I had a dentist appointment today.  First in many, many years.
> > Marriage is a good thing.
> >
> > 	Greg
>