Indexes
CatConstraintSide (Enumeration)
enum CatConstraintSide {
catCstSidePositive,
catCstSideNegative,
catCstSideSameAsValue,
catCstSideOppositeToValue,
catCstSideUndefined
}
Constrained elements relative side.
When two geometrical elements are constrained, there is often a variety
of relative positions and orientations of these elements that respect
the constraint. For instance,
if a distance constraint is placed on two planes,
the second plane can lie on both sides of first plane while maintaining
the requested distance: the constraint is respected, but
geometry remains unresolved. Furthermore, even if the side is fixed,
second plane still can be oriented so that its normal points towards the
first plane or in the opposite direction, without breaking the constraint.
Managing such indetermination requires control over two variables:
- Side
- determines, when relevant, on which side of each other constrained
elements should be positionned
- Orientation
- determines, when relevant, how to orient constrained elements,
whith respect to each other.
This enum deals with possibles options for dealing with the Side
variable (see CatConstraintOrientation for possibles options for Orientation).
This enum is based on the notion of characteristic vector. A
characteristic vector is a vector which is associated with a constrained
element each time it can be assimilated to a line or a plane. The vector
represents the direction of the line, or the direction normal to the
plane.
- Values:
-
- catCstSidePositive
- First constrained element characteristic vector points towards
second constrained element.
Arithmetic sign of constraint value is ignored, only its absolute
value is taken into account.
- catCstSideNegative
- First constrained element characteristic vector points opposite to
second constrained element.
Arithmetic sign of constraint value is ignored, only its absolute
value is taken into account.
- catCstSideSameAsValue
- Arithmetic sign of constraint value specifies where second element
lies with regard to first one: a positive value means in the direction
of first constrained element characteristic vector, a negative value in
the opposite direction.
- catCstSideOppositeToValue
- Arithmetic sign of constraint value specifies where second element
lies with regard to first one: a negative value means in the direction
of first constrained element characteristic vector, a positive value in
the opposite direction.
- catCstSideUndefined
- Relative positionning of constrained elements is not defined.