ALB026 Alignment agreement on cant point of rotation

[civilx64]

Proposed new rule per IFC4.x-IF/#160. Creating this issue as a starting point for discussion and agreement on the requirements.

This will be a normative rule categorized as an implementer agreement.

Scenario 1: Rotation about left railhead

BusinessLogic

• CantLeft = 0.0
• CantRight = full cant amount

Representation:

• Segment Placement Z coordinate = 0.5 * full cant amount
• Segment Placement RefDirection = downward to the left

Scenario 2: Rotation about right railhead
BusinessLogic

• CantLeft = full cant amount
• CantRight = 0.0

Representation:

• Segment Placement Z coordinate = 0.5 * full cant amount
• Segment Placement RefDirection = downward to the right

Scenario 3: Rotation about center of rails
BusinessLogic

• CantLeft (absolute value) = 0.5 * full cant amount
• CantRight = -1 * CantLeft

Representation:

• Segment Placement Z coordinate = 0.0
• Segment Placement RefDirection = downward to the left or right depending on sign of CantLeft / CantRight

IFC files
linear placement of signal