Hey there, since i´ve started to develop a Scenery for "Erfurt - Bindersleben" Airport (ICAO: EDDE) i had been on this site researching for Tutorials how to create Custom Runways and such, you know... , the basic stuff. So i came along Bill Womack's Great great Tutorial on creating High Quality Ground Polygons. Everything worked out nicely appart from one problem. When i'm for example in the Piper Cub Taxiing on those Ground Poly's they seem to disappear or flicker arround the Airplane. I really have no clue what is going and i hope some of you Pro's can help me out on this thing. On the Attachments i putted in some Screenshots of the Situation. Both the Taxiline and the Ground Poly´s were created in the same manner except that in the Taxiline ASM Code i inserted the number "12" instead of "8" because i wanted it to be above the Poly. Code: ADDCAT OBJECT_0_SCALE, 12 So, thank in advantage and excuse myself for my English, i speak German for living.