Measurable objects are objects that can be used for minimum distance calculation against other measurable objects. They include:
Collections are also measurable, since they might contain measurable objects.
Measurable objects can have their measurable property individually enabled or disabled (enabled by default for non-primitive shapes, OC trees and point clouds). This can be set in the object common properties or through the sim.setObjectSpecialProperty API function.
Additionally, measurable objects can have their measurable property overridden depending on their related model properties (if they are part of a model). Refer to the model dialog for more information.