A tips to change the direction of  loop in a single face.

Sometimes, during modeling, is useful to change the direction of the loop.
I have seen several tutorials that explain how to do but all require the modification of more faces. This, in some cases, may cause the creation of non-coplanar faces or triangular face  or even be impossible.
i will show you a simple technique that allows the change of direction of a loop by changing a single face.

.1) The loop follows its natural path

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. 2) Select the face of the intersection and turns it into two triangles (CTRL T)

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. 3) Select the edge central  and subdivide (w> Subdivide)
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. 4) Select two triangular faces and merge, repeat with the other two faces  (F)
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. 5) Now I have two faces that seem triangular but are square. move towards the inner corner the central vertex.
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. 6) Now the loop turns magically in the desidered direction
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. 7) I can add many loops as i want , at the end I can merge the subdivided vertex with the vertex in the angle and merge the two triangular faces in a square.

Fernando Luceri