Regarding the issue of coordinate system rotation, the difference in stiffness matrix obtained from the original model is shown in line 72:

The principal bending axes rotated from the user coordinate system by 179.00765138963922 degrees about the positive direction of x1 axis.

At this point, I have two options:

<rotate>-179.00765138963922</rotate>

or

<rotate>0.99234861036078</rotate>

I can get The principal bonding axes rotated from the user coordinate system by 0 degrees about the positive direction of x1 axis

But some elements of the stiffness matrix I obtained are completely opposite, and I still don't quite understand why the angle is 0-180 instead of 0-360, or the direction is positive and negative, not just positive

bei li@ onRegarding the issue of coordinate system rotation, the difference in stiffness matrix obtained from the original model is shown in line 72:

The principal bending axes rotated from the user coordinate system by 179.00765138963922 degrees about the positive direction of x1 axis.

At this point, I have two options:

<rotate>-179.00765138963922</rotate>

or

<rotate>0.99234861036078</rotate>

I can get The principal bonding axes rotated from the user coordinate system by 0 degrees about the positive direction of x1 axis

But some elements of the stiffness matrix I obtained are completely opposite, and I still don't quite understand why the angle is 0-180 instead of 0-360, or the direction is positive and negative, not just positive

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