Could anyone teaches me how to add a background in the rendered picture in PS? I know that the "alpha cannel" image can help to set the transparency of a picture but I have no idea how to do so. Thanks you for answering!

@chon said:

Hello,

@unknownuser said:

In your material editor, under the diffuse channel, Check the "use colour texture for transparancy" box.

True if your Bitmap is saved in PNG...

Thank you so much! I'll try later

The edge of the tree is transparent before rendering. Anyone can teach me how to solve this problem? Thanks!