one question about position.

[hzsyber]

getAbsolutePosition() and getPosition() return values difference.

thanks!

[nathanf534]

I believe getAbsolutePosition returns the position from the origin (0,0,0), while getPosition() returns the position relative to its parent.

[hzsyber]

thanks nathanf534!

getAbsolutePosition is self origin or world origin?

and,i load a node, getAbsolutePosition and getPosition return value is equally.

how to i get a node position return from world origin?

because i load a node default position no in world origin(0,0,0).

thanks.

[vitek]

getAbsolutePosition is self origin or world origin?

World origin or (0, 0, 0) in the the world coordinate system.

and,i load a node, getAbsolutePosition and getPosition return value is equally.

Yes. If a node is created without a parent, both of these functions will return the same value. If the node has a parent, and the parent is not at the world origin (i.e., parent->getAbsolutePosition() returns something other than (0, 0, 0)) then the values will differ.

how to i get a node position return from world origin?

Uh... node->getAbsolutePosition() is the offset from the node position (in world coordinates) to the world origin.

[hzsyber]

ObjNodes->getAbsolutePosition();

reutrn Position always (0,0,0).
not my want.

[arras]

getAbsolutePosition() returns global (world) position regardless of what you want.

[dlangdev]

ObjNodes->getAbsolutePosition();

reutrn Position always (0,0,0).
not my want.

It tells you where node is/was at (0,0,0). Can't argue with that.

[vitek]

You may have to call updateAbsolutePosition() before getAbsolutePosition() will return the actual world position.

[hzsyber]

maybe model design no position on world origin.

i want know model and world origin length.

someone can try my model. tell me how to know?

my code:

Code: Select all

			nodes[k] = smgr->addAnimatedMeshSceneNode(smgr->getMesh(modelfile.c_str()));
//			nodes[k]->setScale(StrToV3df(scale));
			nodes[k]->setMaterialTexture(0, driver->getTexture(texturefile.c_str()));
			nodes[k]->getMaterial(0).Shininess = 50.0f;
			nodes[k]->setLoopMode(false);
			nodes[k]->setMaterialFlag(EMF_LIGHTING, false);

download model:http://www.reqi.com/md2.rar

thanks all!

[rogerborg]

Code: Select all

const core::aabbox3d<f32>& box = nodes[k]->getBoundingBox();

You can then use the bounding box methods to find the centre and extents of the box.

[zillion42]

I'm not really sure where to start, but there have been some serious confusions about a sceneNodes position, absolute position, and relative position for me... and as I read in the forum for quite a few other people...

Well as hopefully any sane person would expect a relative position is relative to its parent. If you would call getPosition() on a node with a parent you would get its position relative to its parent. Likewise if you would call getAbsolutePosition() on a node with a parent node, you should get its position relative to (0,0,0), provided you call updateAbsolutePosition() before like vitek stated earlier.
If the node however doesn't have, never had, and never will have a parent node, then getPosition() should also always return its position relative to (0,0,0)
And without stating the obvious much longer, my question would be...
never hesitate stating the obvious...
Is that currently the case ?

because I find myself more often than seldom using getBoundingBox() Methods to determine the absoultePosition of nodes....

[hybrid]

getPosition and getAbsolutePosition work exactly as you've described. And I also think that's the most intuitive and expected way those functions should work.

[arras]

Just as a note ...all scene nodes have some parent. If you don't assign parent yourself then it is root scene node. Since its origin is at global origin than calling getPosition on one of its children will return their absolute position.