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(missing init, refresh registering object and camera missing)
Render without showing anything on screen, while still calling all the graphics functions: the window and its OpenGL context are created as usual, they are simply never mapped on screen (GLFW_VISIBLE hint). Available as '--offscreen' in runSofaGLFW, and in runSofa with the glfw and imgui GUIs. SofaGLFWGUI::RegisterGUIParameters() declares it for both of them: GUIManager declares the parameters of every registered GUI, so the function guards against a second registration. Fullscreen is ignored in offscreen mode, and switchFullScreen() (F11) is refused, since it would map the window.
'-n'/'--nbIter' only stopped the batch GUI; with glfw or imgui the simulation ran until the window was closed, which made it impossible to run a bounded simulation while still rendering, e.g. together with '--offscreen'. The argument is registered by the batch GUI, and cxxopts refuses a duplicate, so it is not declared a second time: SofaGLFWGUI keeps the ArgumentParser given to RegisterGUIParameters and reads the already parsed value in mainLoop(). Only arguments actually present on the command line end up in the parse result, hence the simulation keeps running indefinitely when '-n' is not given. 'infinite' is supported as in the batch GUI.
The imgui GUI is the glfw one plus interactive widgets, so rendering it without ever showing the window serves no purpose.
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based on
This complements nicely #298 and output each frame in a PNG file, like pushing the keystroke
v.This allows to create offline video of simulations through docker, or remotely with ssh on a HPC
It could also be useful for creating regression test of rendering