Sir,
>
> There are probable some misunderstandings.
> First, be careful with using the term "sketch". A sketch is a BRL-CAD
> primitive which isn't very interesting as it is because it's 2D and
> has therefore no correspondence in the 3D world. I.e. you won't find
> much sketches in BRL-CAD models (except maybe in extrudes). What you
> mean is probable drawing/blueprint/model.
>
Yes sir, this is very much clear. By the term sketch I meant the entire
geometric object that is made by the user and not the "sketch primitive".
Second, the geometric objects which represent the real-world entities
> and therefore are the basic components of the models are the regions
> (special type of combinations: the Boolean combinations). Imagine a
> wall with a window in the middle. It can be build from two cuboids.
> But no canonical point from the underlying primitives (corners,
> centroids, middles of the faces) would be a good anchor point for an
> annotation with the stone type, for example. I.e., at least at this
> stage of development, I would leave the determination of the reference
> point completely to the user.
>
Fine, thus the user gives the coordinates as the input irrespect
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