RCC8 / explorer

Shape

About this explorer

Which pairs of regions can share the same spatial relation? This explorer lets you move through that continuous set of possibilities.

RCC8 (Region Connection Calculus) describes eight ways two regions can relate: separate, touching, overlapping, equal, or one inside the other, with or without touching its boundary. Orange is A; blue is B. Each relation is read from A to B.

Choose a shape and a relation, then drag the point in the Feasible set to watch the Regions change. The purple set shows compatible configurations for the current sizes or endpoint slice. Size and position controls let you explore further; the lock keeps your chosen relation.

This is a small inverse-geometry experiment: start with a relation and explore the regions that satisfy it. The ? button explains the controls; ∑ shows the constraints.

Relation A → B

Size mode A → B

Regions

A B A ∩ B

Sizes length

ℓ_A

ℓ_B

∑ Constraints

Feasible set

Samples

RCC8 / explorer

Drag to explore

Drag to explore