Gabriele Cosmo
92 lines
3.6 KiB
Plaintext
92 lines
3.6 KiB
Plaintext
=========================================================
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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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=========================================================
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examples/extended/visualization/movies
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--------------------------------------
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This example illustrates how to create a movie.
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See https://geant4-userdoc.web.cern.ch/UsersGuides/ForApplicationDeveloper/html/Visualization/makingamovie.html#.
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A) USING /vis/viewer/save AND /vis/viewer/interpolate
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=====================================================
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1) a) To see a pre-prepared example, start this example in interactive mode
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(i.e., without any command line arguments). Just type
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/vis/viewer/interpolate viewfiles/movie-1
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If you want to see an electromagnetic shower
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/run/beamOn
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/vis/viewer/interpolate viewfiles/movie-1
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b) To make your own movie, save a sequence of views with
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"/vis/viewer/save". Then "fly through" with "/vis/viewer/interpolate".
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The procedure is: choose a view, save, choose another view, save, and
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so on until you have, say, 10 saved views. Then you may
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/vis/viewer/interpolate
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Note: This saves views to your current working directory. It is
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always good to remove any pre-existing saved files:
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rm *.g4view
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or save them, e.g.
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mkdir views
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mv *.g4view views
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which can subsequently be interpolated with
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/vis/viewer/interpolate views
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c) Then you have a choice of how to export the movie - see 3 below.
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2) You can use time-slicing to see particles progress through time
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a) To see a pre-prepared example
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/vis/modeling/trajectories/drawByCharge-0/default/setTimeSliceInterval 0.01 ns
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/run/beamOn
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/vis/viewer/interpolate viewfiles/movie-2
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b) To make your own movie
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/vis/scene/add/trajectories rich
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/vis/modeling/trajectories/drawByCharge-0/default/setTimeSliceInterval 0.01 ns
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# Optionally add features (see guidance on /vis/viewer/set/timeWindow/)
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/vis/viewer/set/timeWindow/displayLightFront true 0 0 -20 cm -0.01 ns
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/vis/viewer/set/timeWindow/displayHeadTime true
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/vis/viewer/set/timeWindow/fadeFactor 1
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/run/beamOn
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# Then set a time window and save
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/vis/viewer/set/timeWindow/startTime 0 ns .1 ns
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/vis/viewer/save
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# Then zoom, pan etc to a view of interest
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# Then set the next time window and save
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/vis/viewer/set/timeWindow/startTime .5 ns .1 ns
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/vis/viewer/save
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# Then zoom, pan etc to a view of interest
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# Then set the next time window and save
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/vis/viewer/set/timeWindow/startTime 1 ns .1 ns
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/vis/viewer/save
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# Then another view, the next time window, and a save...
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# ...repeat a few more times
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# Then try
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/vis/viewer/interpolate
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3) How to export images using /vis/viewer/interpolate (OpenGL only)
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/vis/viewer/interpolate ! ! ! ! export
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This produces lots of files.
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You can change export format with (for example)
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/vis/ogl/set/exportFormat jpg
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Then import them into your favourite movie maker - see
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https://geant4-userdoc.web.cern.ch/UsersGuides/ForApplicationDeveloper/html/Visualization/makingamovie.html#
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B) THE OLD WAY
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==============
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These files are inherited from the old "novice" example N03. They draw (and
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optionally, save) views using a macro loop. They have not been tested
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recently. Best to run in batch mode in the build directory. E.g.
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./movies -m visTutor/exN03Vis12.mac
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./movies -m visTutor/exN03Vis13.mac
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John Allison
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15th February 2021
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