[Chimera-users] Two transparent models
goddard at cgl.ucsf.edu
Thu Aug 14 10:16:54 PDT 2008
Daniel Wilson wrote:
> Hi Tom,
> For what we want, the combination of one transparent model with one mesh is working. However, I will play around with the raytracing a few examples with povray and see if it looks better. Seems to make more sense before you invest time in a script.
> The other thing I noticed is that you lose transparency on a whole volume when you color zone one region of it? or am I making something wrong? Is it not possible to have a single volume with two different colours and transparent?
> Thanks for you advice and kind offer,
> Tom Goddard <goddard at cgl.ucsf.edu> schrieb :
>> Hi Daniel,
>> The incorrect transparency in Chimera when 2 or more models are
>> transparent is very difficult to fix and will not be fixed any time
>> soon. The trouble is that Chimera draws each model separately and it is
>> not possible to correctly handle transparency without intermixing the
>> drawing of parts of models (in depth order).
>> If you use Chimera image saving in the POVray raytracing mode it will
>> correctly show multiple transparent models. The trouble is that this
>> takes a long time to render and adjusting the levels of transparency
>> many times to get the right appearance may be tedious.
>> It would be possible to make a script that combines the currently
>> displayed map surfaces into a single model and hides all the original
>> models so that multimodel transparency would appear correct on-screen.
>> But the combined model would not update when you changed the
>> transparency, color, ... settings of the separate maps. It would
>> require rerunning the script that makes the single model. This would be
>> tedious to use. But if you think it worth trying I can write the script
>> and send it to you. It would not work for transparent molecular models
>> (ribbons and atoms), just surfaces.
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