平面の位置を 3 ポイント ヘルパーに合わせておく方法

--Create a plane and 3 point helper
thePlane = Plane()
p1 = point pos:[40,-10,30]
p2 = point pos:[20,30,40]
p3 = point pos:[-10,-20,30]
--Create a Transform Script and assign it to the Plane
ctrl = transform_script()
thePlane.transform.controller = ctrl
--Create three Node variables and assign the Helpers to them
ctrl.addNode"p1" p1
ctrl.addNode"p2" p2
ctrl.addNode"p3" p3
--We create a variable to hold the expression
--We calculate the vector from Point01 to Point02
txt ="v1 = normalize (p2.pos-p1.pos)\n"
--and the vector from Point01 to Point03
txt +="v2 = normalize (p3.pos-p1.pos)\n"
--The cross productof the two vectors is the normal to the plane
txt +="nv1 = normalize (cross v1 v2)\n"
--Thecross product ofthenormal and vector 1gives us a third axis
txt +="nv2=normalize(cross nv1 v1)\n"
--We create a matrix3 value using he first vector,
--and the two cross products which are all orthogonal to each-other.
--The translation part .row4 is the middle point
--of the 3 points' positions:
txt +="matrix3 v1 nv2 nv1 ((p1.pos+p2.pos+p3.pos)/3)"
--Assign the expression to the script controller
ctrl.setExpression txt