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== Mesh Selection Tools Based on Sharpness and Flatness ==

A patch with an implementation of this described functionality
can be found here:

http://projects.blender.org/tracker/index.php?func=detail&aid=3678&group_id=9&atid=127

This document discusses two related selection operations
that should improve the workflow for some modelling tasks.
A particular application might be mechanical modelling
where one might want to separate what might be called
a 'virtual face' -- a collection of faces that might
have a common, relatively low, curvature so that as a
collection they might serve the function of one, irregularly
shaped, curved face. A set of neighboring coplanar faces
would be a good example of this, but this concept could
be made more flexible to include surfaces with similar
curvature, such as the inside of a teacup, or the rim of
a coin.

In what follows we will be describing 'sharpness' and
'flatness' as properties of the angle between
adjacent faces. If this angle is small, then we
call the edge that is shared by the adjacent faces
'sharp'. If it is a large angle, then we call this
angle 'flat' (and, of course, if the angle between the
faces is 180 degrees the faces are coplanar and the
edge between the two faces is indeed flat).

== Select Sharp Edges ==

This selection tool works in either vertex or edge selection modes
and does not depend on the current selection.

The user can activate the feature through the select menu in either
the 3D window header, or the toolbox. The hotkey Ctrl-Alt-Shift-S is
also available. A 'sharpness' angle is then specified by the user.

[[Image:sharp1.png]]

For each edge that shares exactly two adjacent faces, the
angle between the two faces is tested, and if that angle is
found to be less than the 'sharpness' angle, the edge is
selected.

[[Image:sharp2.png]]

An application where this would be useful is when you want
to use a subsurf modifier to increase the resolution of the
round parts of a mesh, but you want to maintain sharp edges. With
this feature you can select the sharp edges, then crease them
so that they aren't smoothed away in the derived subdivision
surface.

== Select Linked Flat Faces ==

This tool depends on the current selection and only works in
face selection mode.

The user selects some faces, and activates the tool from the
select menu of either the 3d view header or the toolbox,
or through the hotkey Ctrl-Shift-Alt-F.

The user provides an angle, the 'flatness'.

[[Image:flat1.png]]

The current selection is then expanded to include a zone
of faces who's perimeter consists of sharp edges.
The process works so that the original selection grows to include
faces that are adjacent to the selected faces, provided that the angle
between a selected face and an adjacent face is greater than the
'flatness' angle. Those faces that are adjacent to the newly selected faces
are similarly tested and potentially selected, and this process continues
until no new faces can be selected, producing a region of linked 'flat'
faces.

[[Image:flat2.png]]

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