Hi,
I'm trying to place plan regtion over my stairs so that it would cut where I want it to. The attached image shows on the right hand side, stairs with global view range cut at 1200mm above the associated level (note that it is cutting through the landing). Therefore on the left hand side, a plan region I created with cut plane at 1100mm so that it cuts below the landing but everything just disppeared. Funny thing is if I apply the 1100mm cut plane in global view range setting it would look fine but I only want it to cut at 1100mm only at this level. Would anyone know why is this happening? Your help is much appreciated. Thanks!