LUA Scripting Examples 2

The context is:

$ROICIIndex contains index of ROI sampling point
$ROICIIndexMin = 1
$ROICIIndexMax = 7
$ROICIIndexMin <= $ROICIIndex <= $ROICIIndexMax

The following example shows how to use a rotation matrix to apply on the 3D vector of dataset profile M2 at sampling point of ROI:

vec = vector.new
mat = matrix.new

-- Define one time the 3D rotation matrix of 180 degrees
if $ROICIIndex == $ROICIIndexMin then
  local a = mat(3, 'rotation', math.rad(180), 0) -- 0 = X rotation, 1 = Y rotation, 2 = Z rotation

  _luacache['rot'] = a
end

-- Returns the result of rotation of the 3D vector of dataset profile M2 at sampling point of ROI
_luareturnvalue = _luacache['rot']*M2!Vector