mulitple render layers

i started to try out some effects using the compositioner and the render layers

however, when i have multiple renderlayer (3+) i cant combine them anymore with the alpha over node

what do i have to do to combine 3 or more renderlayers into one image (the composition node)??

To combine images 1, 2, and 3 with nodes:

Send 1 + 2 as inputs to one node (A).
Connect output of node A to one input of another node (B), image 3 to the other input of B, send B output to the composite.

i had that

and it worked for 3 renderlayers, but when i tried that with 4 layers

1
>----
1
>-----compositioner
1
>----
1

the image only showed 3 of the 4 renderlayers

thats what confused me a bit, any ideas?

If you are using alpha over you need to make sure you have them hooked up to the inputs in the right order so that the image that should be on ‘top’ shows up on top (it has to go in the second input).