Rotation around parent?

[instinct]

I want to rotate a SceneNode around it's parent. The docs say rotation is done relative to its parent, but apparently calling setRotation does not rotate it around the parent my problem is best explained using sample code:

Code: Select all

pParent->setPosition(vector3df(0,0,0));

pChild->setParent(pParent);
pChild->setPosition(vector3df(-20,0,0));

//now, i want the child to get on position (20,0,0)
pChild->setRotation(0,180,0);

So basically what Im trying to achieve is to make pChild change position by rotating it around its parent, thus some sort of making half a circle with respect to its parent.

Im obviously doing it wrong, but how to do it correct?

[hybrid]

You'd add an empty scene node as parent of the top node, at relative position (0,0,0). Then add your second node as child of this empty node. Now rotate the empty node to (0,180,0) and your child node will rotate around the center of the top node.

[instinct]

Doh, why didn't i think of this....thanks hybrid!

[kamikaze942]

tried the parent/child thing as described.

as you stated

You'd add an empty scene node as parent of the top node, at relative position (0,0,0).

since i want my camera to rotate around my hero. I chose the hero to setparent->emptyscene node and set position to (0,0,0)

Then add your second node as child of this empty node.

empyscene->addchild(camera)

Now rotate the empty node to (0,180,0) and your child node will rotate around the center of the top node.

it's rotating relatively to (0,0,0) =( not the hero. what do i need to set to make sure it's turning around the hero? also the hero is moving around the axis as well.

[Lonesome Ducky]

Set the empty scene node's position to where you want it the camera circle around.