What is "Mesh from Positive/Negative Side" for Force Reaction using Construction Surface?
It is based on Coordinate System (CS) used to create the Construction Surface. When a local CS is created, a Construction Surface is created along the XY plane of that CS. A Force Reaction probe can be placed using the Location Method “Surface” with the required Construction Surface selected from the drop-down list. "Mesh from Positive Side" refers to the positive Z direction of the local CS used to create the Construction Surface and "Mesh from Negative Side" refers to the negative Z direction.
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