RebarConstraint

For Shape Driven Rebar Constraints:

Each handle on a rebar is defined by a plane, and can be constrained along the direction perpendicular to a surface. Rebar constraints work by locking the handle planes to targets. These targets can be: surfaces of host elements (faces or cover), the handle planes of other Rebar element or any generic surface.

A special case is for of a straight, standard style bar, running perpendicular to the plane of the stirrup bar. This bar can constrain itself to distinct locations along bends in stirrup bars - points located at 0 degrees, 45 degrees, 90 degrees, etc. around each bend. This is done by simultaneously locking both the straight bar's edge handle and its planar position handle to one or both of the stirrup edges adjacent to the bend in the stirrup.

Usually, to form a constraint, the handle plane and the reference plane must be parallel. However, bar end or segment handles can be constrained to planes at angles up to 84 degrees. Arc-shaped rebar is a special case, and can form constraints to concentric host surfaces.

For Free Form Rebar Constraints:

Each handle of the Rebar can be constrained to multiple host faces or to the face cover.

In order to create a Free Form Rebar Constraint you will need:

1. RebarConstraintsManager which will manage the constraint.
2. The rebar handle you want to constraint.
3. A list of target references which must be element faces to which this handle is constrained.
4. A Boolean value specifying that the constraint is to cover or directly to face. It will be the same value for all target references
5. A double value that represent the offset distance from the rebar handle to target references.

RebarConstraints for Free Form Rebar should be created using the Create method and then added to the RebarConstraintsManager using the method SetPreferredConstraintForHandle.