Creating Objects Programmatically

andargor · 04-25-2011 06:48 AM

Is it possible to create objects purely programmatically? I can already dynamically create objects (from the tutorial), but I have to load an object that has a predefined mesh to do so.

I would like to create shapes, boxes, spheres, perhaps assemble them, apply textures, create physics, and create an object out of that. Not static, probably derived from Game::Item and it would move around.

Doable? if so, how? Can Game::World.objCreate be used?

Rabishan · 04-25-2011 08:25 AM

do you have rpg 2 source code.
if so then the player created in that game is by program.
i don't know how to explain you exactly.
but if you see NewGameClass (Menu.cpp) and InitGame(Game.cpp) you can get some idea.

andargor · 04-25-2011 04:48 PM

Unfortunately I need the license for RPG 2 source, so not yet. smile

I guess a code snippet would be out of the question, but if you could tell me the steps, I could probably figure things out.

Otherwise I'll read all the headers for hints.

Truelegend · 04-25-2011 05:11 PM

I dont know you mean this but

Code:

Object MyGameObject;

Actor   MyActor;

...?

andargor · 04-25-2011 09:13 PM

What I mean is creating objects purely by programming, and not loading files. This is as close as I get for now, but nothing appears (object volume reads as 0, it doesn't seem to have any size, so I'm looking into that).

EDIT: Nothing visible appears, but the object does get created and put into the game world.

Also, I'm worried about pointer safety and memory cleanup. Does Esenthel clean these up on exit? Or I have to use something like the Reference class?

Code:

        MeshBase mb;

        mb.create(Box(0.3f));

        MaterialPtr mat = new Material();

        mat->color = Vec4(0.5f,0.5f,0.5f,0.5f);

        MeshPtr mesh = new Mesh();

        mesh->add(mb);

        mesh->setRender(); // EDIT: this makes the object visible

        Game::ObjParams obj;

        obj.type(true, "OBJ_VEHICLE");

        obj.mesh(true, mesh);

        obj.material(true, mat);

        Game::Obj *g = Game::World.objCreateNear(obj,Matrix(obj.scale(),Vec(0,0,0)));

Ok, adding mesh->setRender() after the add makes it appear.

The question about the pointers and memory still stands. And why does it report 0 volume/0 size?

Dynad · 04-25-2011 09:35 PM

Hi,

I made a small example creating a sphere from code + physics. Dunno if this is what you are looking for but its basically a good base to start from smile

Yes everything will be cleaned which is EE related.

PHP Code:

/******************************************************************************/
#include "stdafx.h"
/******************************************************************************/
Actor ground, ballActor;

Mesh ballMesh;
PhysBody ballphys;

Flt size;
/******************************************************************************/
void InitPre()
{
    App.name("Simple Code");
    App.flag=APP_MS_EXCLUSIVE;
    Paks.add("../data/engine.pak");
    D.sync(true);
}
Bool Init()
{
    Cam.dist=4;
    size = 0.5f;

    Physics.create(CSS_NONE,true,"../Installation/PhysX");
    ground .create(Box (15,1,15,Vec(0,-5,0)), 0);

    ballMesh.parts.New().base.create(Ball(size),VTX_TEX0|VTX_NRM|VTX_TNG);
    ballMesh.setMaterial(Materials.ptrRequire("../data/mtrl/brick/0.mtrl")).setRender().setBox();    

    ballActor  .create(Ball(size   ,Vec(0.0f, 0, 0)))
        .adamping(5   )
        .ccd     (true);

    return true;
}
/******************************************************************************/
void Shut()
{
}
/******************************************************************************/
Bool Update()
{
    if(Kb.bp(KB_ESC))return false;
    CamHandle(0.1f,10,CAMH_ZOOM|CAMH_ROT);

    Physics.startSimulation().stopSimulation();

    if(Kb.bp(KB_SPACE))ballActor.addVel(Vec(0,3,0));

    return true;
}
void Render()
{
    switch(Renderer())
    {
    case RM_PREPARE:
        {
            ballMesh. draw(ballActor.matrix(), ballActor.vel(),ballActor.angVel());

            LightPoint(20,Vec(0,3,-3)).add();
        }break;
    }
}
void Draw()
{
    Renderer(Render);

    ground.draw();
} 

andargor · 04-25-2011 10:33 PM

Cool, thanks! I see that your example doesn't use Game::World. Is that faster for a large number of objects/actors?

Also ballphys doesn't seem to be used. I used your shortcut for mesh creation, however, makes things a bit tidier. I'm trying to add physics atm, with something like this:

PhysBodyPtr pb = new PhysBody();
pb->parts.New().createMesh(*mesh);

Not working yet... grin

Dynad · 04-25-2011 10:37 PM

createMesh works only on static objects.

andargor · 04-25-2011 10:41 PM

yay! got it. Now I only have to figure out how to create materials.

EDIT: Got the material too, I've updated the code below

PHP Code:

        MaterialPtr mat = new Material();
        mat->color = Vec4(0.2f,0.2f,0.7f,0.7f);
        mat->ambient = Vec(0.2f,0.2f,0.2f);
        mat->specular = 0.5f;
        mat->validate();

        MeshPtr mesh = new Mesh();
        mesh->parts.New().base.create(Box(0.3f),VTX_TEX0|VTX_NRM|VTX_TNG);
        //mesh->setMaterial(Materials.ptrRequire("data/mtrl/brick/0.mtrl")).setRender().setBox();
        mesh->setMaterial(mat).setRender().setBox();

        PhysBodyPtr pb = new PhysBody();
        pb->parts.New().create(mesh->box);

        Game::ObjParams obj;
        obj.type(true, "OBJ_VEHICLE");
        obj.mesh(true, mesh);
        obj.phys(true, pb);

        Game::Obj *g = Game::World.objCreateNear(obj,Matrix(obj.scale(),Vec(0,0,0))); 

Creating Objects Programmatically
Author	Message