the enclose multipatch tool unfortunately yields bad results. I have a multipatch FC created from an extrusion between two TIN surfaces for the area of building footprints. The Is Closed tool shows that a lot of Multipatch Features are not properly closed. Now I used the Enclose Tool to close these polygons, but this results in most shapes being distorted or looking damaged, some are also missing. Furtheron, how does the grid parameter affect the results? I often get the error message "use larger grid size", but using a larger grid size, ArcScene crashes. Using a grid size of 0.4 was the only handable value, but results in the mentioned distorted shapes. Any idea how I can close my multipatches and continue calculating surface area and volume?