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Specifies the principal direction 1 of the fiber mat preform in global coordinates. The following principle direction 1 orientations can be set:
- Along the x-axis: dx=1, dy=0 dz=0.
- Along the y-axis: dx=0, dy=1, dz=0.
- 45° from the x and y-axes: dx=1, dy=1 and dz=0.
Note It is recommended that you specify this orientation because, for an anisotropic fiber mat, the fiber-mat permeability in principal direction 1 is different from the fiber-mat permeability in principal direction 2, and the fiber-mat cross permeability may or may not be zero.