Irrlicht Engine

Posted: **Sun Jun 15, 2008 10:50 pm**

Hey, quick question.

How to replace a mesh/node for another mesh/node, freeing memory (so the old triangles will be thrown out)?

i got globbaly:

Code: Select all

IAnimatedMesh* mesh;
ISceneManager* smgr;
IAnimatedMeshSceneNode* node = 0;

and a func:

Code: Select all

void mapChange(int mapnum)
{
 /*switch(mapnum){
  case 1:{mesh->drop(); mesh = smgr->getMesh("room01.obj"); break;}
  case 2:{mesh->drop(); mesh = smgr->getMesh("terrain06.obj"); break;}
  case 3:{mesh->drop(); mesh = smgr->getMesh("terrain01.obj"); break;}

 }*/
 //smgr->getMeshCache()->removeMesh(mesh);
 mesh->drop();
//node->drop();
 if(mapnum == 1){mesh = smgr->getMesh("room01.obj");node = smgr->addAnimatedMeshSceneNode(mesh);}
 if(mapnum == 2){mesh = smgr->getMesh("terrain06.obj");node = smgr->addAnimatedMeshSceneNode(mesh);}
 if(mapnum == 3){mesh = smgr->getMesh("terrain01.obj");node = smgr->addAnimatedMeshSceneNode(mesh);}
}

I tried few things but seems that memory isn't freed.
I think (i am not sure i'm right) that memory of a node isn't deleted, but when i add node->drop() the program is crashing

It is releted to terrain. I want swiching the terrain to be fast and simple, and to load a mesh on place of the old one.

I think maybe someone done this before so i'd be happy for a solution

If not i will try myself...

Posted: **Mon Jun 16, 2008 8:16 am**

You should only drop those structures which you are allowed to drop, and also only once. For meshes, you might have to delete them from the mesh cache, which also holds a grab on the mesh. So I guess that you dropped the grab of the cache, but that one was still accessing the mesh (or dropped it upon program exit) and crashes then. But properly deleting the mesh from the cache should free the memory.

Posted: **Wed Jun 18, 2008 10:23 am**

so... uhm... maybe you can provide me a small example?

Posted: **Thu Jun 19, 2008 10:49 am**

oh, mighty people of Irrlicht, please share your insane knowledge, and help me solve my problem! Ame... Enter!:P

Posted: **Thu Jun 19, 2008 11:16 am**

No, I usually don't give code fragments. But I'd help you to improve yours. So just check the API for mesh cache and propose a first version.

Irrlicht Engine

Node/Mesh replace, freeing memory? Some help, please ;)

Node/Mesh replace, freeing memory? Some help, please ;)