Re: [away3d] Re: childOfObject.LookAt(Vector3D) ?

[John Brookes]

Going off topic from the thread

Just playing with what you did keeping both x and z parallel. Forgeting
about looking at a target for now.

In papervison there was copy3x3Matrix, which was handy for that sort of
thing.
Basically invert the parent then copy the 3x3Matrix(rotation) to the child.

So how is that done in AS3?

I can do it like this

var m3:Matrix3D = Matrix3D(container.transform).clone();
m3.invert()

var raw:Vector.<Number> = Matrix3DUtils.RAW_DATA_CONTAINER;
childObject.transform.copyRawDataTo(raw);

raw[uint(0)] = m3.rawData[0]
raw[uint(1)] = m3.rawData[1]
raw[uint(2)] = m3.rawData[2]

raw[uint(4)] =  m3.rawData[4]
raw[uint(5)] =  m3.rawData[5]
raw[uint(6)] =  m3.rawData[6]

raw[uint(8)] = m3.rawData[8]
raw[uint(9)] = m3.rawData[9]
raw[uint(10)] = m3.rawData[10]

Matrix3D(childObject.transform).copyRawDataFrom(raw);


And that works.

In the new flash Player there is now copyColumnTo and copyColumnFrom.
So shirley this should do the same

var m3:Matrix3D = Matrix3D(container.transform).clone();
m3.invert()

var childCloneM3:Matrix3D = Matrix3D(childObject.transform).clone();

var xAxis:Vector3D = new Vector3D()
m3.copyColumnTo(0, xAxis);
childCloneM3.copyColumnFrom(0, xAxis);

var yAxis:Vector3D = new Vector3D()
m3.copyColumnTo(1, yAxis);
childCloneM3.copyColumnFrom(1, yAxis);

var zAxis:Vector3D = new Vector3D()
m3.copyColumnTo(2, zAxis);
childCloneM3.copyColumnFrom(2, zAxis);

var pos:Vector3D = new Vector3D()
m3.copyColumnTo(3, pos);
trace(pos)
childCloneM3.copyColumnFrom(3, pos);

childObject.transform = childCloneM3;


Notice the postion is not copied, weird.