Getting mesh from node

[BernieRoehl]

How do I get a mesh from a scenenode?

I've loaded a .irr file using sceneMnager->loadScene(). Some of the meshes in the scene are things I want the user to collide with, and other meshes shouldn't affect the user's movement through the scene.

I think to myself, "this is easy -- I'll just have a userdata entry to indicate which objects should be colliders". So I add the userdata to my .irr file, and create a subclass of scene::ISceneUserDataSerializer whose OnReadUserData method looks for my "isCollider" attribute. It finds it okay, so my next step is to add the parent node's mesh to the MetaTriangleSelector for collision obstacles in the scene.

But wait! I can't get the mesh! Even though I have a reference to the node, the mesh is protected!

What should I do? Am I missing something?

[rogerborg]

I can't for the life of me understand why IMeshSceneNode and IAnimatedMeshSceneNode don't provide accessors for their meshes. I just went ahead and added them locally, which took about 5 minutes. Perhaps bitplane or one of the other maintainers can shed light on this curious omission.

[UPDATE]
Patch submitted.

[needforhint]

IMesh node->GetMesh(0) ;
the parameter number is the identifier of the mesh. Only in IAnimatedmeshscenennode class you can use some higher value than 0, so u get mesh on appropriate frame

[BernieRoehl]

IMesh node->GetMesh(0) ;
the parameter number is the identifier of the mesh. Only in IAnimatedmeshscenennode class you can use some higher value than 0, so u get mesh on appropriate frame

Yes, something like that would be perfect. Is there any chance this could be added to the main code base? I'm trying to avoid having to modify the engine.

[sgt_pinky]

Yes, something like that would be perfect. Is there any chance this could be added to the main code base? I'm trying to avoid having to modify the engine.

What do you mean 'add it to the main code base'? It's there - he was giving you the answer!!!

[JP]

It's not there

He wants to get a mesh from a scene node, what that code does is get a mesh from a mesh, or a specific frame from an animated mesh.

[sgt_pinky]

Ah, you're right. Sorry, my mistake.

[needforhint]

hey guys, what I wrote down is not even a code ,
a will try so know, as exact as it gets

Code: Select all

scene::IMesh* earthMesh = smgr->getMesh( "earth.x");

scene::ISceneNode* sphere = smgr->addMeshSceneNode(earthMesh);

scene::IMesh* copyfromnodeMesh = NULL;

copyfromnodeMesh = sphere->getMesh(0); // AHA!

[BernieRoehl]

Code: Select all

scene::IMesh* earthMesh = smgr->getMesh( "earth.x");

scene::ISceneNode* sphere = smgr->addMeshSceneNode(earthMesh);

scene::IMesh* copyfromnodeMesh = NULL;

copyfromnodeMesh = sphere->getMesh(0); // AHA!

Yes, that's the sort of method I'm looking for. Sadly, it doesn't exist.

I've checked the 1.1 help file (not the 1.0 API ref that's online), and I've even checked the .h files in case the help file was out of date.

Sadly, SceneNode does not have a getMesh() method. The TerrainSceneNode does, but not SceneNode.

Is it possible that you're running a modified version of the code?

[hybrid]

This method has been requested very often. I never checked if there are any things wrong with it, but I think it's worth adding it and fixing problems later on in case they appear...

[dloomis]

Really how else is there to add collision to a mesh loaded via .IRR?

[vitek]

Sadly, SceneNode does not have a getMesh() method. The TerrainSceneNode does, but not SceneNode.

It is perfectly acceptable to request the IMeshSceneNode get a getMesh() and the IAnimatedMeshSceneNode get a getAnimatedMesh(). That said, the scene node class ISceneNode should NOT have a getMesh() method.

[BernieRoehl]

Sadly, SceneNode does not have a getMesh() method. The TerrainSceneNode does, but not SceneNode.

It is perfectly acceptable to request the IMeshSceneNode get a getMesh() and the IAnimatedMeshSceneNode get a getAnimatedMesh(). That said, the scene node class ISceneNode should NOT have a getMesh() method.

Yes, fair enough. Of course, it's a little bit odd that SceneNode has a getMaterial() method -- shouldn't that really be on MeshSceneNode as well, like getMesh()?

[needforhint]

Code: Select all

scene::ISceneNode* sphere = smgr->addMeshSceneNode(earthMesh); 

If that is possible it means ISceneNode has a member of IMesh* type.

If following was possible

Code: Select all

scene::IMeshLessSceneNode* sphere = smgr->addMeshSceneNode(earthMesh); 

then IMeshLessSceneNode node has a IMesh* member . So function that returns this IMesh* member is I think appropriate.

[hybrid]

No, needforhint, it is a question of 'all objects' and 'some objects'. In both cases you have 'one object' which means it is only a special case and thus you are overgeneralizing here.