Alpha texture problem

[devilreborn]

Hi all,
I ran into a problem when applying partially transparent textures to a sketchup model.
I have two different textures of trees painted onto three separate faces, as shown below:

However, if I change the camera angle so that the faces now overlap, the problem appears.

There are some transparent areas incorrectly displayed so that you can see through all 3 faces instead of showing the second face behind.
Both textures are stored in 32-bit TGA format (with an alpha channel). I have also tried to convert the textures to PNG but the same problem persists.

[kaas]

Displaying layered transparencies is a bit harder (more calculations) for render engines. Have you tried changing the style settings to transparency - nicer ?