Set a rotation center point other than 0,0,0 to a scenenode?

ChrML · Post by **ChrML** » Fri Feb 25, 2005 7:11 pm

Is that possible? I need this for a physics engine I'm making. ISceneNode doesn't seem to have any member function doing that, and I don't want to do this in the modeller.

djceejay · Post by **djceejay** » Fri Feb 25, 2005 9:40 pm

Rotating by x degrees
Object position o
Centre of rotation c

Rotate it around 0,0,0 by x
Get a vector from the object and the centre of rotation, call it v (v = o-c )
Rotate this vector, v, by x ( v.rotate(x) )
Move the object to the end of the vector v. ( o = c+v )

How about that?

Murphy · Post by **Murphy** » Fri Feb 25, 2005 9:48 pm

One way to do it is to create a "dummy" node, with the real node attached as a child at a given offset.

ChrML · Post by **ChrML** » Fri Feb 25, 2005 10:27 pm

Oki, maybe I'll use the modeller after all

, as the engine can never know where the rotation center was from before if there are no simple function for it

. Thanks anyway.