Save a Video using irrlecht pychrono

[Declan Mulroy]

Hello, 

I was scrolling threw the source code for irrlicht.py and was not sure  if any of these commands can be used?

 def SetVideoframeSave(self, val):

        """SetVideoframeSave(ChIrrAppInterface self, bool val)"""

        return _irrlicht.ChIrrAppInterface_SetVideoframeSave(self, val)

    def GetVideoframeSave(self):

        """GetVideoframeSave(ChIrrAppInterface self) -> bool"""

        return _irrlicht.ChIrrAppInterface_GetVideoframeSave(self)

    def SetVideoframeSaveInterval(self, val):

        """SetVideoframeSaveInterval(ChIrrAppInterface self, int val)"""

        return _irrlicht.ChIrrAppInterface_SetVideoframeSaveInterval(self, val)

    def GetVideoframeSaveInterval(self):

        """GetVideoframeSaveInterval(ChIrrAppInterface self) -> int"""

        return _irrlicht.ChIrrAppInterface_GetVideoframeSaveInterval(self)

Another question Is there a way to show the time passed in POV Ray?

Thanks, 

Declan Mulroy

[Qiyuan Zhou]

Hi Declan

You can save frames from Irrlicht in Python by adding the highlighted lines:

            myapplication = chronoirr.ChIrrApp(self.my_system,self.sim, chronoirr.dimension2du(1600,1200))

            myapplication.AddTypicalSky()

            myapplication.AddTypicalLogo('logo_pychrono_alpha.png')

            myapplication.AddTypicalCamera(chronoirr.vector3df(0,2,.75),chronoirr.vector3df(0,0,.75))

            myapplication.SetSymbolscale(.002)

            myapplication.SetShowInfos(True)

            myapplication.SetContactsDrawMode(2)

            myapplication.SetPaused(True)

            myapplication.AddLightWithShadow(chronoirr.vector3df(2,5,2),chronoirr.vector3df(2,2,2),10,2,10,120)

            myapplication.DrawAll               

            myapplication.AssetBindAll();

            myapplication.AssetUpdateAll();

            myapplication.AddShadowAll();

            myapplication.SetTimestep(self.tstep)

            myapplication.SetTryRealtime(False)

            while(myapplication.GetDevice().run()):

                myapplication.BeginScene()

                myapplication.DrawAll()

                print ('time=', self.my_system.GetChTime())

                # run step

                myapplication.DoStep()

                myapplication.EndScene()

                # save data

                myapplication.SetVideoframeSave(True)

                myapplication.SetVideoframeSaveInterval(10)

                # Close the simulation if time ends

                if self.my_system.GetChTime()> self.tend:

                    myapplication.GetDevice().closeDevice()

These frames are then by default saved in the same directory as the .py file as your model under a directory named "video_capture"

[Alessandro Tasora]

hi

use myapp.SetVideoframeSave(True) to enable automatic saving of all frames to disk (look same folder of the app to see the bmp files).

Use myapp.SetVideoframeSaveInterval(5) for example to save just 1 frame each 5. Default is 1.

Note that -given a limitation in Irrlicht screen grabbing code- if you move some window in front of the Irrlicht 3d view, the first window will 'cover' the second.

Alessandro Tasora

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[Declan Mulroy]

Excellent. Thanks Alessandro and Qiyuan!

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Declan Mulroy
Direct: (847)-767-3222

PhD Student at  Armour College of Engineering

Illinois Institute of Technology

[Declan Mulroy]

Just a follow up question, 

Is there a way to save the images out to a specified folder? 

Right now it exports the images to video_capture but I wanted to see if I could export the images to a new folder say called sim_1? 

Thank you, 

Declan 

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[Radu Serban]

Yes, you can do that but you will have to invoke the Irrlicht functions yourself.
As an example, look at demo_VEH_M113 (https://github.com/projectchrono/chrono/blob/develop/src/demos/vehicle/demo_M113/demo_VEH_M113.cpp) lines 295-300 and at the implementation of the Chrono::Vehicle function ChVehicleIrrApp::WriteImageToFile (https://github.com/projectchrono/chrono/blob/develop/src/chrono_vehicle/utils/ChVehicleIrrApp.cpp) lines 411-417.

--Radu

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[Declan Mulroy]

Excellent. Thanks radu. I'm doing it in pychrono so I wrote it out like this shown below which I thought is similar 

file="filename" # <-directory im saving the images too  
 image=self.myapplication.GetVideoDriver().createScreenShot()
self.myapplication.GetVideoDriver().writeImageToFile(image,file);

but I keep getting this error 

Not ImplementedError: Wrong number or type of arguments for overloaded function 'IVideoDriver_writeImageToFile'.
  Possible C/C++ prototypes are:
    irr::video::IVideoDriver::writeImageToFile(irr::video::IImage *,irr::io::path const &,irr::u32)
    irr::video::IVideoDriver::writeImageToFile(irr::video::IImage *,irr::io::path const &)
    irr::video::IVideoDriver::writeImageToFile(irr::video::IImage *,irr::io::IWriteFile *,irr::u32)
    irr::video::IVideoDriver::writeImageToFile(irr::video::IImage *,irr::io::IWriteFile *)

I'm not entirely sure what I'm doing wrong.

Thank you in advance,

Declan 

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Declan Mulroy
Direct: (847)-767-3222

PhD Student at  Armour College of Engineering

Illinois Institute of Technology

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