[Chimera-users] Two transparent models and memory leaks
goddard at cgl.ucsf.edu
Thu Mar 22 15:57:00 PDT 2007
Chimera does not correctly handle more than one transparent model. If
you have two transparent models the one with the higher model id number
is rendered second and always appears in front of the one with lower
model id number. The reason you observed different behaviour (sometimes
looks ok, sometimes wrong) is because it depends on the model id
numbers. If the transparent model in front has the higher id number
then it looks ok, otherwise it looks wrong. Opaque models use the
OpenGL depth buffer and do not have this problem.
We will need to look into the memory leak (memory is not released
when closing a session). What version of Chimera, 1.2352?
The crash on Windows is very likely caused by running out of memory
when rendering the image. Capturing a full screen image with
supersampling (made 3x larger in both dimensions = 9x more pixels) can
take significant memory (10 - 100 Mbytes). A machine with 1 Gbyte of
memory is barely adequate for displaying ribosome structures (~100,000
atoms) and large density maps using Chimera. My Mac machines have 1.5
Gbytes and 2 Gbytes and I seldom work with atomic models as large as
yours. Many EM Chimera users I work with use machines with at least 3
Gbytes of memory.
I'll submit a Chimera bug report suggesting we look for the large
memory allocations done during image saving and try to change the code
to catch those allocation failures and avoid crashing.
I don't have a clear picture of the occluded icons problem you
observe with Chimera displaying full screen on your new Linux machine.
Could you send a snapshot of that?
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