Sofa Gui with SofaPython3

Blocked

Hello,

I am trying to automatically record videos of simulations that I start and stop with SofaPython3. Either with Sofa.Gui, or another way?

I have not been able to get Sofa.Gui to work, right now the error I see when I run SofaGui.py (in examples of SofaPython3) is:

(base) sofauser@carbon:/builds/plugins/SofaPython3/examples$ python SofaGui.py 
Supported GUIs are batch,qglviewer,qt

libGL error: failed to open /dev/dri/card0: Permission denied
libGL error: failed to load driver: nouveau
[ERROR]   [ObjectFactory::addAlias()] Target class for alias 'OglModel' not found: VisualModel
[WARNING] [RealGUI] Global Bounding Box seems very small; Your viewer settings (based on the bbox) are likely invalid, switching to default value of [-1,-1,-1,1,1,1].This is caused by using component which does not implement properly the updateBBox function.You can remove this warning by manually forcing a value in the parameter bbox="minX minY minZ maxX maxY maxZ" in your root node 

[ERROR]   [PythonScript] RuntimeError: basic_string::_M_construct null not valid
  File "SofaGui.py", line 19, in <module>
    Sofa.Gui.GUIManager.createGUI(root)

[WARNING] [SofaSimulationTree] the library has not been cleaned up (sofa::simulation::tree::cleanup() has never been called, see sofa/helper/init.h)
[WARNING] [SofaSimulationGraph] the library has not been cleaned up (sofa::simulation::graph::cleanup() has never been called, see sofa/helper/init.h)
[WARNING] [SofaSimulationCommon] the library has not been cleaned up (sofa::simulation::common::cleanup() has never been called, see sofa/helper/init.h)
[WARNING] [SofaSimulationCore] the library has not been cleaned up (sofa::simulation::core::cleanup() has never been called, see sofa/helper/init.h)
[WARNING] [SofaCore] the library has not been cleaned up (sofa::core::cleanup() has never been called, see sofa/helper/init.h)
[WARNING] [SofaDefaultType] the library has not been cleaned up (sofa::defaulttype::cleanup() has never been called, see sofa/helper/init.h)
[WARNING] [SofaHelper] the library has not been cleaned up (sofa::helper::cleanup() has never been called, see sofa/helper/init.h)
(base) sofauser@carbon:/builds/plugins/SofaPython3/examples$

My build details can be found here:
https://github.com/ripl-ttic/SofaFramework-Docker/blob/python3/Dockerfile

To recreate this error, do ./build.sh, ./launch-docker.sh, and then once in the container: cd /builds/plugins/SofaPython3/examples, python SofaGui.py

30 December 2020 at 14:50 #18091

Moderator

Hey @amackeith,

Are you able to launch runSofa? Or any GUI application using OpenGL?

> libGL error: failed to open /dev/dri/card0: Permission denied
> libGL error: failed to load driver: nouveau

The error you are having here looks more to me as a driver problem than SOFA…

J-N

30 December 2020 at 19:00 #18092

Blocked

Hi @jnbrunet,

Thanks for your response!

Using runSofa works fine (the gui loads and I can run the scene). It even has the same libGL error when it is working.

This is the terminal output from (working) runSofa:

(base) sofauser@carbon:/pkgs/dl/examples/sofa_start$ runSofa
[INFO]    [runSofa] PluginRepository paths = /builds/build/master/lib:/builds/build/master/plugins
[INFO]    [runSofa] DataRepository paths = /builds/src/share:/builds/src/examples
[INFO]    [runSofa] GuiDataRepository paths = /builds/src/applications/projects/runSofa/resources:/builds/src/modules/SofaGuiQt/src/sofa/gui/qt/resources
Created directory: /builds/build/master//config
Created directory: /builds/build/master//screenshots
[INFO]    [runSofa] Loading automatically plugin list in /builds/build/master/lib/plugin_list.conf
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralVisual.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGraphComponent.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralMeshCollision.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaBoundaryCondition.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralAnimationLoop.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralDeformable.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralEngine.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralExplicitOdeSolver.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralImplicitOdeSolver.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralLinearSolver.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralRigid.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralObjectInteraction.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralSimpleFem.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralTopology.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaTopologyMapping.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaUserInteraction.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaConstraint.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaGeneralLoader.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaSparseSolver.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaPreconditioner.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaHaptics.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaValidation.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaDenseSolver.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaNonUniformFem.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaOpenglVisual.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaMiscTopology.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaMiscExtra.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaMiscForceField.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaMiscEngine.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaMiscSolver.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaMiscFem.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaMiscMapping.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaExporter.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libCImgPlugin.so
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaMiscCollision.so
[INFO]    [SofaPython3]  Initializing with python version 3.7.4 (default, Aug 13 2019, 20:39:44) 
[GCC 7.3.0]
[INFO]    [SofaPython3] Registering a scene loader for [.py, .py3, .pyscn, .py3scn] files.
[INFO]    [SofaPython3] Shared library name is 'libpython3.7m.so'
[INFO]    [SofaPython3] Intializing python
[INFO]    [SofaPython3] Added '/builds/build/master/python3/site-packages' to sys.path
[INFO]    [SofaPython3] Added '/builds/src/applications/plugins/SofaTest/python' to sys.path
[INFO]    [SofaPython3] Added '/builds/build/master/lib/python3/site-packages' to sys.path
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaPython3.so
[INFO]    [GUIManager] INFO(SofaGUI): lastUsedGUI.ini not found; using default GUI.
libGL error: failed to open /dev/dri/card0: Permission denied
libGL error: failed to load driver: nouveau
Warning: Setting a new default format with a different version or profile after the global shared context is created may cause issues with context sharing.
The constructor with a QGLFormat is deprecated, use the regular contructor instead.

[INFO]    [SceneCheckerVisitor] Validating node "root" with checks: [SceneCheckDuplicatedName, SceneCheckMissingRequiredPlugin, SceneCheckUsingAlias]
[INFO]    [SceneCheckerVisitor] Finished validating node "root".
(base) sofauser@carbon:/pkgs/dl/examples/sofa_start$

30 December 2020 at 20:36 #18093

Moderator

Hey @amackeith,

Alright, I’ve missed the error on the ‘OglModel’ component.

Can you try adding the following at the beginning of your script:


import SofaRuntime
SofaRuntime.importPlugin('SofaOpenglVisual')

J-N

30 December 2020 at 23:36 #18094

Blocked

Hi @jnbrunet,

This is the exact script I’m using, I’ve added the two lines you suggested to this file: https://github.com/sofa-framework/SofaPython3/blob/master/examples/SofaGui.py

So it looks like this:

import Sofa
import Sofa.Core
import Sofa.Simulation
import Sofa.Gui

import SofaRuntime
SofaRuntime.importPlugin('SofaOpenglVisual')

print ("Supported GUIs are " + Sofa.Gui.GUIManager.ListSupportedGUI(","))

root = Sofa.Core.Node("root")
# Create the rest of the scene here...

# Initialize all components found in the scene
Sofa.Simulation.init(root)

# Launch the GUI
Sofa.Gui.GUIManager.Init("simple_scene", "qt")
Sofa.Gui.GUIManager.createGUI(root)
Sofa.Gui.GUIManager.MainLoop(root)
Sofa.Gui.GUIManager.closeGUI()

I still get the original error though (though with fewer warnings):

(base) sofauser@carbon:/builds/plugins/SofaPython3/examples$ python SofaGui.py 
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaOpenglVisual.so
Supported GUIs are batch,qglviewer,qt
libGL error: failed to open /dev/dri/card0: Permission denied
libGL error: failed to load driver: nouveau
[WARNING] [RealGUI] Global Bounding Box seems very small; Your viewer settings (based on the bbox) are likely invalid, switching to default value of [-1,-1,-1,1,1,1].This is caused by using component which does not implement properly the updateBBox function.You can remove this warning by manually forcing a value in the parameter bbox="minX minY minZ maxX maxY maxZ" in your root node 

[ERROR]   [SofaRuntime] RuntimeError: basic_string::_M_construct null not valid
Traceback (most recent call last):
  File "SofaGui.py", line 24, in <module>
    Sofa.Gui.GUIManager.createGUI(root)

[WARNING] [SofaSimulationTree] the library has not been cleaned up (sofa::simulation::tree::cleanup() has never been called, see sofa/helper/init.h)
(base) sofauser@carbon:/builds/plugins/SofaPython3/examples$

31 December 2020 at 12:32 #18095

Moderator

Hey @amackeith,

Crap, I think I know what’s going on. This is a bug on SOFA’s API side. Can you try swapping the following line:


Sofa.Gui.GUIManager.createGUI(root)

for


Sofa.Gui.GUIManager.createGUI(root, __file__)

We should fix this before the next release, I’ll create an issue on Github.

Let me know if it worked.
J-N

31 December 2020 at 18:58 #18096

Blocked

Hi @jnbrunet,

The edit you suggested successfully opens a Gui!

However, once I try to add something to the scene I get the [ERROR] [SofaRuntime] RuntimeError: basic_string::_M_construct null not valid error again:

This is my code now:

import Sofa
import Sofa.Core
import Sofa.Simulation
import Sofa.Gui

import SofaRuntime
SofaRuntime.importPlugin('SofaOpenglVisual')

print ("Supported GUIs are " + Sofa.Gui.GUIManager.ListSupportedGUI(","))

root = Sofa.Core.Node("root")
# Create the rest of the scene here...

def Sphere(rootNode, name, position, color):
    #Creating the sphere
    sphere = rootNode.addChild(name)
    sphere.addObject('MechanicalObject', name="mstate", template="Rigid3", position=position)
    
    #### Visualization of the sphere
    sphereVisu = sphere.addChild("VisualModel")
    sphereVisu.loader = sphereVisu.addObject('MeshObjLoader', name="loader", filename="mesh/ball.obj", scale=0.5)
    sphereVisu.addObject('OglModel', name="model", src="@loader", color=color)
    sphereVisu.addObject('RigidMapping')
    return sphere

Sphere(root, "hi", "0 0 0", None)

# Initialize all components found in the scene
Sofa.Simulation.init(root)

# Launch the GUI
Sofa.Gui.GUIManager.Init("simple_scene", "qt")
Sofa.Gui.GUIManager.createGUI(root, __file__)
Sofa.Gui.GUIManager.MainLoop(root)
Sofa.Gui.GUIManager.closeGUI()

This is my output:

(base) sofauser@carbon:~/workdir/simple_control_policy$ python gui_sofa.py 
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaOpenglVisual.so
Supported GUIs are batch,qglviewer,qt
libGL error: failed to open /dev/dri/card0: Permission denied
libGL error: failed to load driver: nouveau
[WARNING] [RealGUI] Global Bounding Box seems very small; Your viewer settings (based on the bbox) are likely invalid, switching to default value of [-1,-1,-1,1,1,1].This is caused by using component which does not implement properly the updateBBox function.You can remove this warning by manually forcing a value in the parameter bbox="minX minY minZ maxX maxY maxZ" in your root node 

QtViewer: OpenGL 3.3 (Core Profile) Mesa 20.0.8 context created.
[WARNING] [SofaViewer] Could not create file '/builds/src/share/textures/SOFA_logo.bmp'  
  Valid extensions: dds
[WARNING] [SofaSimulationTree] the library has not been cleaned up (sofa::simulation::tree::cleanup() has never been called, see sofa/helper/init.h)
(base) sofauser@carbon:~/workdir/simple_control_policy$ python gui_sofa.py 
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaOpenglVisual.so
Supported GUIs are batch,qglviewer,qt
libGL error: failed to open /dev/dri/card0: Permission denied
libGL error: failed to load driver: nouveau
QtViewer: OpenGL 3.3 (Core Profile) Mesa 20.0.8 context created.
[WARNING] [SofaViewer] Could not create file '/builds/src/share/textures/SOFA_logo.bmp'  
  Valid extensions: dds
[ERROR]   [SofaRuntime] RuntimeError: basic_string::_M_construct null not valid
Traceback (most recent call last):
  File "gui_sofa.py", line 34, in <module>
    Sofa.Gui.GUIManager.createGUI(root, __file__)

[WARNING] [SofaSimulationTree] the library has not been cleaned up (sofa::simulation::tree::cleanup() has never been called, see sofa/helper/init.h)
(base) sofauser@carbon:~/workdir/simple_control_policy$

And this is my output without trying to add the sphere which opens the gui successfully.

(base) sofauser@carbon:~/workdir/simple_control_policy$ python gui_sofa.py 
[INFO]    [PluginManager] Loaded plugin: /builds/build/master/lib/libSofaOpenglVisual.so
Supported GUIs are batch,qglviewer,qt
libGL error: failed to open /dev/dri/card0: Permission denied
libGL error: failed to load driver: nouveau
[WARNING] [RealGUI] Global Bounding Box seems very small; Your viewer settings (based on the bbox) are likely invalid, switching to default value of [-1,-1,-1,1,1,1].This is caused by using component which does not implement properly the updateBBox function.You can remove this warning by manually forcing a value in the parameter bbox="minX minY minZ maxX maxY maxZ" in your root node 

QtViewer: OpenGL 3.3 (Core Profile) Mesa 20.0.8 context created.
[WARNING] [SofaViewer] Could not create file '/builds/src/share/textures/SOFA_logo.bmp'  
  Valid extensions: dds

1 January 2021 at 16:17 #18097

Moderator

Hey @amackeith,

My guess would be that this is caused by the OglModel, and probably related to the driver error you are having. The “Qt” viewer of SOFA is quite old and sensible to the OpenGL extensions available.

Could you try using the qglviewer instead of the Qt one? Simply change


Sofa.Gui.GUIManager.Init("simple_scene", "qt")


Sofa.Gui.GUIManager.Init("simple_scene", "qglviewer")

Note:

@scheikl has seen your post here and suggested the following for your driver problem (he had some problem replying directly here, spam filter issue):

could you check whether your user is part of the video group?
(is video in the output of $ groups?)

If not, that would explain the Permission denied part.
I never quite understood when this is necessary, and when not.
On my system, for example, it works without the video group :D.

You can add your user to the group with

$ sudo usermod -a -G video sofauser

Might not work, but it is worth a try.

This might fix the issue using the “qt” viewer.

J-N

8 January 2021 at 02:21 #18130

Blocked

Hi @jnbrunet,

That has got the GUI working! (EDIT: specifically the change to qglviewer fixed it)

However, I am trying to use this to view a simulation that is controlled by another python script, which steps the animation forward using the “Sofa.Simulation.animate” function. However when I try to use that with the gui, use of that function and “Sofa.Gui.GUIManager.MainLoop” seem to be mutually exclusive. Is this the case?

If so, is there a way to use the gui or record screenshots at every time step without needing to use MainLoop?

8 January 2021 at 09:37 #18134

Moderator

Hey Arthur,

Yeah they are mutually exclusive since the GUI is stealing the main thread.

To be able to draw the scene without a GUI, you would have to create a GL context yourself. You can have a look at the following example which is using pygame to render the SOFA scene.

J-N

8 January 2021 at 17:57 #18161

Blocked

Hi @jnbrunet,

I believe that example is out of date with SofaPython3. I was able to find a solution though. It still requires a display — so unless there is a way to set the QApplication display to offscreen in sofapython3, it is still not ideal for running on a server. That said this is my solution:

# encoding: utf-8
# !/usr/bin/python3

import Sofa
import SofaRuntime
import Sofa.Gui

class scene_interface:
    """Scene_interface provides step and reset methods"""

    def __init__(self, dt=0.01, max_steps=300):

        self.dt = dt
        # max_steps, how long the simulator should run. Total length: dt*max_steps
        self.max_steps = max_steps

        # root node in the simulator
        self.root = None
        # the current step in the simulation
        self.current_step = 0

        # Register all the common component in the factory.
        SofaRuntime.importPlugin('SofaOpenglVisual')
        SofaRuntime.importPlugin("SofaComponentAll")

        self.root = Sofa.Core.Node("myroot")

        ### create some objects to observe
        self.place_objects_in_scene(self.root)

        # place light and a camera
        self.root.addObject("LightManager")
        self.root.addObject("SpotLight", position=[0,10,0], direction=[0,-1,0])
        self.root.addObject("InteractiveCamera", name="camera", position=[0,10, 0],
                            lookAt=[0,0,0], distance=37,
                            fieldOfView=45, zNear=0.63, zFar=55.69)

        # start the simulator
        Sofa.Simulation.init(self.root)
        # start the gui
        Sofa.Gui.GUIManager.Init("Recorded_Episode", "qt")
        Sofa.Gui.GUIManager.createGUI(self.root, __file__)

    def place_objects_in_scene(self, root):
        ### these are just some things that stay still and move around
        # so you know the animation is actually happening
        root.gravity = [0, -1., 0]
        root.addObject("VisualStyle", displayFlags="showWireframe showBehaviorModels showAll")
        root.addObject("MeshGmshLoader", name="meshLoaderCoarse",
                       filename="mesh/liver.msh")
        root.addObject("MeshObjLoader", name="meshLoaderFine",
                       filename="mesh/liver-smooth.obj")

        root.addObject("EulerImplicitSolver")
        root.addObject("CGLinearSolver", iterations="200",
                        tolerance="1e-09", threshold="1e-09")

        liver = root.addChild("liver")

        liver.addObject("TetrahedronSetTopologyContainer",
                        name="topo", src="@../meshLoaderCoarse" )
        liver.addObject("TetrahedronSetGeometryAlgorithms",
                        template="Vec3d", name="GeomAlgo")
        liver.addObject("MechanicalObject",
                        template="Vec3d",
                        name="MechanicalModel", showObject="1", showObjectScale="3")

        liver.addObject("TetrahedronFEMForceField", name="fem", youngModulus="1000",
                        poissonRatio="0.4", method="large")

        liver.addObject("MeshMatrixMass", massDensity="1")
        liver.addObject("FixedConstraint", indices="2 3 50")

    def step(self):
        # step through time

        # this steps the simulation
        Sofa.Simulation.animate(self.root, self.dt)

        # just to keep track of where we are
        self.current_step += 1

        ### A better example would also show how to read and edit values through scripts
        # which would likely be useful if you are running without a normal gui

        # return true if done
        return self.current_step >= self.max_steps

    # save a screenshot from the position of where we set the camera above
    def record_frame(self, filename):
        Sofa.Gui.GUIManager.SaveScreenshot(filename)

def main():
    a = scene_interface()
    done = False
    while not done:
        factor = a.current_step
        done = a.step()
        a.record_frame(str(factor) + ".png")

if __name__ == '__main__':
    main()

14 January 2021 at 13:50 #18222

Moderator

Hey Arthur,

Thanks for sharing your solution !

I agree that it is probably not the best for headless simulation. Some time ago, I made a fully OffscreenCamera that was able to render the SOFA scene into a QtOffscreenSurface. I will try to dig up this old code and bring it back to life. I’ll update this post when it is done.

J-N

30 June 2021 at 16:01 #19906

Blocked

Hi @jnbrunet, i am trying to do the exact same thing for headless simulation. Have you able to dig up the code?

30 June 2021 at 19:54 #19907

Moderator

Hey @anthony,

Yes I did ! Here it is: https://github.com/jnbrunet/SofaOffscreenCamera

12 July 2021 at 12:27 #20008

Blocked

Hi @jnbrunet
Thanks for the code, I managed to get it working. However, the screenshots from the simulation is of low quality, i tried changing the parameters of the camera but could not improve the output. I would be grateful if you could take a quick look at the code and give me some pointers ? the link below contains the pyscn code and the output mp4 simulation.
https://github.com/AnthonyLe93/SofaSoftRobot_TAS

12 July 2021 at 16:20 #20009

Moderator

Hum I’m not sure what’s going on by looking at your mp4. Can you share the mesh files so that I try it?

12 July 2021 at 16:43 #20010

Blocked

Hi @jnbrunet

I have uploaded the mesh files used in the pyscn. Many thanks in advance for looking at this.
https://github.com/AnthonyLe93/SofaSoftRobot_TAS

13 July 2021 at 14:38 #20015

Moderator

Hum I tried to run your scene but I’m not sure what point of view you need for the offscreen camera. Can you launch your scene with runSofa -g qt (using the qt GUI of SOFA), then position your view to the one you want for the offscreen camera, and hit the “Save View” button. This will save a “Ellipse_axial_load (1).pyscn.view” file.

Can you paste here:

1. This Ellipse_axial_load (1).pyscn.view file
2. A screenshot of this point of view (simple screen shot of SOFA’s GUI with the good position

13 July 2021 at 16:35 #20021

Blocked

Hi @jnbrunet

Many thanks for looking at this.

Please see below the view file and a screenshot.

122.979 21.4852 101.304
-0.0980628 0.535538 -0.0488142 0.837377
Screenshot

13 July 2021 at 16:38 #20022

Blocked

Link to the screenshot
https://github.com/AnthonyLe93/SofaSoftRobot_TAS/blob/main/Ellipse_axial_load_screenshot.png

14 July 2021 at 16:48 #20029

Moderator

Hey Anthony,

I’m sorry for the delay, I did not find the source of the problem yet, and I’m running a little bit low on time this week. I reduced your example to a very minimal scene:

import Sofa

def createScene(rootNode):
    rootNode.addObject('RequiredPlugin', pluginName='SofaPython3 SofaOpenglVisual SofaLoader SofaOffscreenCamera')
    rootNode.addObject('MeshSTLLoader', filename='Ellipse_cylinder_tas.stl', name="loader")
    rootNode.addObject('OglModel', src="@loader", color=[1, 0, 0, 1])
    rootNode.addObject('OffscreenCamera',
                        name='camera_offscreen',
                        filepath='%s_%i.png',
                        widthViewport=3840,
                        heightViewport=2160,
                        save_frame_before_first_step=True,
                        save_frame_after_each_n_steps=1,
                        position=[123, 21, 101], orientation=[-0.0980628, 0.535538, -0.0488142, 0.837377], distance=151)

I will try to debug this further in the next couple of days.

@froy : do you have something OpenGL related that pops into your head when you see these two images:

Expected result:

Actual result:
actual

Jean-Nicolas

15 July 2021 at 09:55 #20032

Froy

Keymaster

@jnbunet

I cannot really see well on the screenshot (the pipe is a bit far from the camera 🧐) but seems like there is a problem with depth; maybe depth testing is disabled ? (i.e a glEnable(GL_DEPTH_TEST); is missing)

2 August 2021 at 12:30 #20110

Blocked

Hi @jnbunet

My apologise for the late reply I was on holiday. I tried the glEnable(GL_DEPTH_TEST) but the result is still the same. Have you able to find anything that might cause this issue?. Or is there an alternative solution to this?

5 August 2021 at 02:40 #20131