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Our case requires use of a complex grid, so you should select it. Then click on Vertical vector and draw it in the main window besides the selected region. Draw it in the same way as you did the region just that it does not end with starting point. Finish drawing the vector by clicking on the right mouse button. Vectors will be the guiding lines for the mapping of your fabric texture to the area. The vertical and horizontal vectors should intersect, and their borders should be outside the regions. As a minimum, you will need two vertical and two horizontal vectors. Vertical vectors should be drawn from top, and horizontal from left to right. If the fabric has many complicated distortions, you can draw intermediate vectors. Do not mix up vertical and horizontal vectors, and do not forget to intersect them. If you make a mistake, program will not generate any mapping, until you correct the vectors and make them valid. On the picture, you can see two vertical vectors in green, and two horizontal vectors in red.
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