save mesh

[Vladimir_tyutenkov]

Hello,
need help
I create mesh, add vertices, indexes, texture coordinates, normals to it
Then I try to save and get an error
"Attempting to read or write to protected memory"

I tried to insert an example from sdk

https://developer.unigine.com/en/docs/2.7/code/usage/mesh_class/index?rlang=cpp

// create an empty Mesh instance
MeshPtr box = Mesh :: create ();
// add a box surface to the Mesh
box-> addBoxSurface ("surface_box", Math :: vec3 (1.0f));
// save the box to a file
box-> save ("box.mesh");

and also get an error,

what could be the problem?

[silent]

Hi Vladimir,

Sorry, but we can't reproduce the same behavior on our side (tested on 2.7.3 SDK), save is working as expected. Could you please send us a minimal reproduction code?

Thanks!

[Vladimir_tyutenkov]

minimal code

#include <iostream>
#include <UnigineApp.h>
#include <UnigineConsole.h>
#include <UnigineEngine.h>
#include <UnigineGame.h>
#include <UnigineLights.h>
#include <UnigineLogic.h>
#include <UnigineWorld.h>
#include <UnigineEditor.h>
#include <UnigineBounds.h>
#include <UnigineInterpreter.h>

using namespace Unigine;
using namespace Unigine::Math;

int main()
{
    MeshPtr box = Mesh::create();
    // add a box surface to the Mesh 
    box->addBoxSurface("surface_box", Math::vec3(1.0f));
    // save the box to a file
    box->save("box.mesh");
}

[silent]

Try to initialize engine first:

int main(int argc, char **argv)
{
	EnginePtr engine(UNIGINE_VERSION, argc, argv); // engine init
	MeshPtr box = Mesh::create();
	// add a box surface to the Mesh 
	box->addBoxSurface("surface_box", Math::vec3(1.0f));
	// save the box to a file
	box->save("box.mesh");
}

 

 

[Vladimir_tyutenkov]

With engine initialization it works, but
this is an excess operation for the export plugin to the .mesh format

[silent]

I'm afraid, it's not possible to use Engine API without initialization of Engine itself.

[Vladimir_tyutenkov]

how then to initialize the engine without launching the render window and other windows (in the background)

[silent]

You can use -video_app null command line option to run process without window and graphics context. In that case all GPU-related classes (Texture, Render and similar) will be unavailable.