Swapping the model of a mesh?

[Dragfang]

Hi, I'm having some troubles with an RTS-game that I'm making.

I'm using getMesh to load a model to a mesh, but I'm not able to then change that model to another model using the same mesh.

Code: Select all

//Declaration
IAnimatedMesh* objectMesh;
ISceneNode* objectNode;
ITriangleSelector* objectSelector;
ISceneNodeAnimator* objectAnim;

// Loading model and stuff
objectMesh = smgr->getMesh("media/townhall.obj");

if (objectMesh)
{
	objectNode = smgr->addOctreeSceneNode(objectMesh->getMesh(0));
}

if (objectNode)
{
    objectNode->setPosition(vector3df(350,1,100));
    objectSelector = smgr->createOctreeTriangleSelector(objectMesh->getMesh(0), objectNode, 128);
    objectNode->setTriangleSelector(objectSelector);
}

if (objectSelector)
{
	objectAnim = smgr->createCollisionResponseAnimator(objectSelector, camera, vector3df(30,50,30),vector3df(0,0,0),vector3df(0,10,0));
	camera->addAnimator(objectAnim);
	objectAnim->drop();
}

// Trying to change the model, fails
objectMesh = smgr->getMesh("media/townhall_unbuildable.obj");

It's something like that but a bit more complicated that I'm trying. In the example above my "objectMesh" gets the model townhall.obj, and not townhall_unbuildable.obj. Is it just me failing or is there any other function for swapping to another model?

Update: I tried setting the node to position (500,-5000,500) and then running addOctreeSceneNode again and that worked, but I got horrific FPS quite fast since I was stacking old models at position (500,-5000,500).

[serengeor]

I don't really remember how exactly is this done but I know that you can find your answer in Mesh Viewer example

[hybrid]

I guess first thing to learn is C++. Then you'll notice that assigning a new object to an existing pointer won't do anything to the previously stored oject. So first think about what should happen with the old object. And do that, e.g. call remove on it. Then get the new mesh, and add it to the sceen manager. Either as octree or as usual object.

[Dragfang]

I guess first thing to learn is C++. Then you'll notice that assigning a new object to an existing pointer won't do anything to the previously stored oject. So first think about what should happen with the old object. And do that, e.g. call remove on it. Then get the new mesh, and add it to the sceen manager. Either as octree or as usual object.

Exactly, I wanna call a remove on it, I searched the API.net for such function but couldn't find one. So I'm not quite sure on how to do it.

Should this work or am I doing something wrong?

Code: Select all

IAnimatedMesh* objectMesh;
ISceneNode* objectNode;
ITriangleSelector* objectSelector;
ISceneNodeAnimator* objectAnim;

// Loading model and stuff
objectMesh = smgr->getMesh("media/townhall.obj");

if (objectMesh)
{
   objectNode = smgr->addOctreeSceneNode(objectMesh->getMesh(0));
}

if (objectNode)
{
    objectNode->setPosition(vector3df(350,1,100));
    objectSelector = smgr->createOctreeTriangleSelector(objectMesh->getMesh(0), objectNode, 128);
    objectNode->setTriangleSelector(objectSelector);
}

if (objectSelector)
{
   objectAnim = smgr->createCollisionResponseAnimator(objectSelector, camera, vector3df(30,50,30),vector3df(0,0,0),vector3df(0,10,0));
   camera->addAnimator(objectAnim);
   objectAnim->drop();
}

objectNode->remove();
objectMesh = smgr->getMesh("media/townhall_unbuildable.obj"); 
objectNode = smgr->addOctreeSceneNode(objectMesh->getMesh(0));

I've only used the remove(); for GUI-related stuff before, but would it work for a node like this? And is it the node that I should use remove(); on?

[hybrid]

Yes, this would change the scene node (actually remove the old one and create the new one). Usage is correct. You might want to remove the mesh from the mesh cache as well, in case you don't ever use it again.

[Dragfang]

Yes, this would change the scene node (actually remove the old one and create the new one). Usage is correct. You might want to remove the mesh from the mesh cache as well, in case you don't ever use it again.

Allright Thanks a lot!