Hi Zottel1, Thank you for the tip. That does help, didn't try that before. Have only worked in the wire frame. But not exactly my problem. I did not explain it well. When trying to put an object behind another, or object behind a terrain, the object will not intersect at the overlap to appear behind it. It stays in front of the other. I have tried setting attributes to positive but that doesn't work. I have done it, but it doesn't always work. Is it the sequence of using the objects? Thanks for your patience with me. Bee