Archive 17/01/2023.

First 3D Model class, which should be its inheritance Model?

codefive

I have been using the First Project template for my porpuses, great one, but now i want to create more classes, but i dont know which should be its inheritance, the model class?

I want this class to do the following.-

1.- Create a parent node
2.- Based on that parent node create several subnodes, all based in little 3D models, (i dont care if they are only Boxes)
3.- That way i will have a more complex 3D Model but attached to the parent node (and its sub nodes)
4.- Alter the model position (i think a simple function will do that or constructor)
5.- Place later the model in my main Application class (yep other story)

Could someone give me a hint to create such a class? Basically i dont know which its inheritance should be. Or this is too much for me a beginner ? I been reading a lot, thank you in advance

Modanung

I’d inherit from LogicComponent and in its OnNodeSet(Node* node) create the sub-nodes and their models. During the Update(float timeStep) it would modify the position of it’s child nodes.

codefive

Oh such a precious information, thank you @Modanung now i can just begin LOL

Modanung

Furthermore you will have to register your component - before instantiation - by calling RegisterFactory<MyComponent>() on the Context. Hereafter you can call CreateComponent<MyComponent>() on a node to conjure your component.

codefive

Thank you again, in that i will need more reading, but with this kind of help from your part i will stop being a noob soon Thank you !!!

Modanung

I made a simple component a year and a half ago for demonstration purposes that may be of use to fill some more gaps in your understanding as well:

github.com

Modanung/WindmillComponent/blob/master/windmill.h


#ifndef WINDMILL_H
#define WINDMILL_H

#include <Urho3D/Urho3D.h>
/*
#include <Urho3D/Graphics/StaticModel.h>
#include <Urho3D/Physics/RigidBody.h>
#include <Urho3D/Scene/LogicComponent.h>*/
#include "luckey.h"

class Windmill : public LogicComponent
{
    URHO3D_OBJECT(Windmill, LogicComponent);
public:
    Windmill(Context* context);
    static void RegisterObject(Context* context);
    void OnNodeSet(Node* node) override;
    void Update(float timeStep) override;
};

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github.com

Modanung/WindmillComponent/blob/master/windmill.cpp

#include "windmill.h"

void Windmill::RegisterObject(Context* context)
{
    context->RegisterFactory<Windmill>();
}

Windmill::Windmill(Context* context) : LogicComponent(context)
{
}

void Windmill::OnNodeSet(Node* node)
{ if(!node) return;

    node_->LookAt(Quaternion(90.0f, Vector3::UP) * node_->GetPosition() * 2.0f, Vector3::UP, TS_LOCAL);
    node_->Translate(Vector3::UP * Random(4.2f));
    node_->Rotate(Quaternion(Random(90.0f), Vector3::RIGHT));

    StaticModel* staticModel{ node_->CreateComponent<StaticModel>() };
    staticModel->SetModel(GetSubsystem<ResourceCache>()->GetResource<Model>("Models/WindmillWings.mdl"));

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codefive

Great !! yes it helps a lot !!