Okay, gotcha. You may find it easier to paint a tree, however. As for cutting out a tree using Painter, try using Color Select (assuming they use the same term in P3D). Color select allows you to choose the background color (by clicking in it) a build a mask using that color or some expanded variation of it. It's a little tricky to grasp at first, but try this: Click to select the background color. If the background color is close to the same as the tree, you're going to find it difficult to separate the two. Nevertheless, try this. Move the S Extents and S Feather sliders all the way to 100 or 200%, whichever is highest. Do the same with V Feather and Hue Feather. Use H Extents to broaden the range of colors selected (add in yellow and blue greens). Use V Extents to broaden the range of values, (add in darker versions of the color range). The little preview window will show red where the mask is being applied. When you get what you want, click on OK. From there, you can convert your mask to a selection, Save the Selection as an Alpha channel and use that to isolate the tree in Bryce. Good luck,