BS"D
Dear Andreas
I ran into a similar problem more than two years ago when I wanted
to fade one surface and bring in another one. *But*, I thought the
problem did not appear when you ray trace the image; are you implying
the problem exists even in the ray traced image? Below is the query I
sent, and Warren's answer to me:
I wanted to slowly fade in one surface while fading out
another. In other words, make one progressively less
transparent, while the other is made more transparent. It
turns out, unfortunately, that during the transition, the two
transparent surfaces affect each other adversely, and one
essentially blocks the other, even though they should be
transparent. This is shown on the second picture. The gray
surface is 20% transparent, and the salmon surface is 80%
transparent. The gray surface is fine by itself, but seems
"covered" in certain regions when the (mostly transparent)
salmon surface is present. In ray tracing, this seems not to
be a problem (see first picture...).
Harry,
You've hit a limitation with PyMOL's OpenGL renderer: it can't
currently do
a global Z-sort of all transparent triangles in a scene...just
within a
single object. This will be addressed eventually, but not soon.
Ray tracing with transparency_mode=1 is the only way to get proper
intersections of transparent surfaces.
Sorry!
Warren
On Apr 10, 2007, at 2:12 PM, Andreas Forster wrote:
Hey all,
I've run into the following problem while making some movies with
MacPyMOL 0.99rc6.
I have a protein in surface representation that I start with
transparency = 0 and a cavity (voidoo-created map) as surface with
transparency = 1. In other words, the protein surface is visible,
the cavity is not. When I cross-fade the transparencies, like so:
for i in range (1, 41):
cmd.set ("transparency", i*0.025, "protein")
cmd.set ("transparency", 1-(0.016*i), "cavity")
cmd.ray
cmd.png ("fadeOut_%02d" %i)
the protein disappears and the cavity appears gracefully. However,
those parts of the cavity hidden behind a wall of protein don't
fade in as the protein surface disappears. They only appear when
the protein surface transparency has reached 1, and there is a
sudden jerk between the second-to-last and the last image created
by above script as the cavity becomes fully visible. I remember
that this issue has come up before but don't remember if there is a
solution. Could someone enlighten me please?
Thanks.
Andreas
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Harry M. Greenblatt
Staff Scientist
Dept of Structural Biology harry.greenbl...@weizmann.ac.il
Weizmann Institute of Science Phone: 972-8-934-3625
Rehovot, 76100 Facsimile: 972-8-934-4159
Israel
