Add node to world at run-time (C++)

[punit.shah]

Hello,

 

I need to create a node (i.e. ObjectMeshStatic) at run-time and want to add it to list of nodes of already loaded world.

 

So far, I've succeeded in creating the ObjectMeshStatic node. But when adding to nodes' list through Unigine::Editor::addNode method, node is not visible (not rendering).

Also, I'm able to get the list of nodes in the current world with the newly created node's entry in the list.

 

Here's the code for adding node dynamically (C++):

bool createNodeRunTime()
{
    Unigine::ObjectMeshStaticPtr pOMS = Unigine::ObjectMeshStatic::create("core/meshes/material_ball.mesh", 1 /*unique=1*/);
    if (!pOMS)
        return false;

    pOMS->setMeshName("core/meshes/material_ball.mesh");    //relative path to data dir.
    pOMS->setMaterial("material_ball", 0);
    pOMS->release();

    Unigine::NodePtr newNode = pOMS->getNode();
    if (!newNode)
        return false;
    Unigine::Editor::get()->addNode(newNode);

    m_vecNodes.append(newNode);    // Unigine::Vector<Unigine::NodePtr>  m_vecNodes;

    Unigine::Console::get()->run("world_save");

    return true;
}

 

after executing world_save command, there's entry in world file as follows:

<node type="ObjectMeshStatic" id="19595027" prefab_id="190089851" name="new_node">
	<mesh_name>core/meshes/material_ball.mesh</mesh_name>
	<surface name="material_ball_mat" material="material_ball"/>
	<transform>1 0 0 0.0 0 1 0 0.0 0 0 1 0.0 1 1 1 1.0</transform>
</node>

When I'm starting the application and loading the same world file through config file, I'm able to see the node (i.e. ObjectMeshStatic) which was added earlier.

 

I want to see the added node immediately in the rendering view.

 

I don't know what and where I'm missing something...

 

Any help greatly appreciated.

[silent]

Hi Punit,

We've checked your code - it's working fine in our case.

 

Could you please send us a minimal test project from SDK Browser? Also if you can provide some screenshots where you can' see your node - it would be very helpful. Right now we are not completely clear what is the current behavior and expected.

 

Thanks!

[punit.shah]

Hello,

 

I'd implemented it slightly other way....& achieved it.

 

I've called that function (i.e. createNodeRunTime()) from update() of class derived from SystemLogic.

Being a multi-threaded environment, there's use of events. So, as per the samples of SDK browser, it's not possible to have that function called from init() of SystemLogic or WorldLogic derived classes. Creation of nodes at run-time may happen any time throughout the life time of the application.

 

So, my next question is...

"Is it acceptable and optimized way to create run-time nodes in update() method, provided there's a multi-threaded environment for hosting application ?"

[silent]

Hi Punit,

 

It should be OK to create nodes in update() (that's what for this method is designed for). You can also check this article for more information: https://developer.unigine.com/en/docs/2.5/code/fundamentals/execution_sequence/code_update

 

Thanks!

[the_m0rzh]

I'm curious, is there a way to do the same in 2024 and in c#? Just can't find  Editor.AddNode(). I have  community license if this matters.

[fox]

Hi, @the_m0rzh

Could you explain, what exactly do you want to achieve?

You don't need Editor  at all to create nodes at runtime. Check out this section of our free course to learn the basics of node creation/removal at runtime.

You can also check Create Nodes samples from the C# Samples Suite (SDK Browser: Demos -> C# Component Samples -> Create Nodes).

Hope this helps.