# Intersection Priority

This function allows the intersection priority of a house contour to be changed. The house contours are then re-centered and intersected with each other. Free roof surface deformations are lost in the process.

### Impacts:

The intersection priority can be used to influence how the roofs are intersected with each other.

If both roofs have the same intersection priority, they intersect each other: when two roof surfaces penetrate one another, each is cut by the other. The portions of the roof surfaces that lie beneath the other roof surface are removed.

If one of the two roofs has a higher intersection priority (i.e., a smaller number), that roof is not cut and remains as it is. The roof with the lower intersection priority (i.e., a larger number) is cut against the other roof. The portions of the roof surfaces that lie beneath the roof surfaces of the other roof (with the higher priority) are removed.

A special case is the intersection priority '0'. A roof with this intersection priority is not considered during an intersection. It is neither cut itself nor does it influence the intersection of another roof.
