Use the include angle highlighting tool to show the non-included angle between flat
mesh triangles.
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On the 3D View
contextual tabs set, on the Mesh tab, in the
Tools group, click the Include angle icon.
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In the Angle field, specify the non-included angle
to be highlighted.
The non-included angle is highlighted in the
3D view
with pink color where applicable.
Tip: The triangle normals must point in
the same direction for the angle calculation.