# New House Contour

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A building outline is the basis for roof determination. The sides of the building outline are assigned the profile values for roof determination. Typically, the building outline corresponds to the outer edges of the exterior walls, but it can also be defined completely independently of them.

Each structure can contain any number of building outlines, which may overlap one another. Each building outline is a closed, independent polyline.

When roof surfaces from different building outlines intersect, they are automatically clipped with one another. The 'priority for auto clipping' allows influencing how the roof surfaces should be clipped together. The clipping priority is attached to the building outline and applies to all roof surfaces that belong to that building outline. If a building outline has a priority of 0, it is ignored during clipping, as if it did not exist. From a priority of 1 onward, the roof surfaces are clipped. If both roof surfaces have the same priority, they are clipped against each other. As soon as one roof surface has a higher priority (i.e., a smaller number), the other roof surface is cut to the roof surface with the higher priority. The roof surface with the higher priority remains intact. (see also change clipping priority)

There is the option to create the outline manually by entering individual points, to input it via a table, or to derive it from existing wall entries using wall transfer. For wall transfer, the storey must be selected. It is possible to choose between the edges of the exterior walls or the reference axis as the basis for the building outline. For this, the outline must be closed.
