The Translate, Scale, Rotate menu item is used to modify data points in a geometry object. This is an inplace operation; existing geometry will be updated and no new geometry will be added.
Translate:  Each data point is shifted by the specified amount in the X, Y and Z direction. Positive values will increase the data point by that amount. 
Scale:  Each data point is scaled by the specified amount in the X, Y and Z direction. The Origin value is used to control where scaling starts, so as an example, scaling the data points X=3 and X=5 by 2.0 at an origin of X=2 will result in the new data points X=4 and X=8, respectively. 
The formula for scaling a value can be written as: ((old value)  (origin)) * (scale value) + (origin) = (new value).
Rotate:  Each data point is rotated about the Z axis by an a number of degrees, at the origin (X, Y) as specified by the user. The Rotate option is not supported for grids. 
