Question
How to apply Skew after assigning girder to Rigid Path?
Answer
After creating the Main Path at the location where the Rigid Path is to be created, the Rigid Path referring to the location is created and the girder is assigned.
First of all, there are three things to remember here.
1. RRigid Constraint Path is a straight path created dependent on the existing Constraint Path (Default and Main Constraint Path). <Figure. 1>
2. The Rigid Constraint Path created by giving an Offset (y) value from one Main Constraint Path is shown below in
<Figure. It is not affected by the Skew value because it is created in the same step as 2>.
3. Main Constraint Path is regenerated as a path with the same rate of change as alignment when the upper mode is assigned (Skew can be applied). <Figure. 3>
From the above article, you can see that the Rigid Constraint Path is a straight path, but it is not affected by the Skew value, and the Main Constraint Path is affected by the Skew value.
| Figure. 1 Rigid Constraint Path Concept |
| Figure. 2 Assign upper mode of Rigid Constraint Path |
| Figure. 3 Apply Skew of Main Constraint Path |
Therefore , in order to assign a girder to the Rigid Constraint Path and apply Skew,
After creating the Main Constraint Path at the location where the Rigid Constraint Path is to be created, refer to the Main Constraint Path at the same location to create the Rigid Constraint Path.
Let's look at the example below in more detail.
1. First, create a Main Constraint Path at the location where each girder will be created, and create a Constraint Point
to be a reference point on it.
| Figure. 4 Create Main Constraint Path and Constraint Point |
2. Then, refer to the created Main Constraint Path and Constraint Point to create a Rigid Constraint Path
at the same location.
| Figure. 5 Create Rigid Constraint Path |
3. In this case, when Skew is applied to the alignment, the Main Constraint Path is Skew applied to determine the
position and Skew can also be applied to the Rigid Constraint Path because the Rigid Constraint Path is
regenerated by referring to the location of the corresponding Main Constraint Path.
| Figure. 6 Process of applying Skew to Rigid Constraint Path |
4. The result of assigning the girder to the rigid constraint path created through this process and applying the skew to
the alignment is shown below in Figure. Same as 7.
| Figure. 7 After assigning girder to Rigid Constraint Path, assign layout (Skew=20 degree) |