Generating only one uv image

Support Materials and Textures
1

When I unwraped an object new UVs were generated. They were only on one image.
But then I added new geometry to the same object (in edit mode), and when I unwrap again (with everything selected), the newly added geometry isn’t unwraped on the same image. I need the geometry to be unwraped on the one image. How can I achieve that?
Ty for your help.

Also one unrelated thing: is there a way to save png image with alpha transparency? Or do I have to save one additional image only with alpha, and then process it in image editor.

2

Hummm, added geometry unwraps just fine with the previous object. Try selecting every face then unwrap by selecting Smart UV Project.

3

I managed to correct the problem by using “Consolidate into one image” in the Image menu.