Bake Lightprobes Only

Unity Engine
1

I have a simple scene with some objects and Lightprobes positions set up.
The objects are spheres with a simple shader attached that just shows the Vertex Color. They are set to static. (that’s the mesh I want to probe against)

Now I would like to bake just the Lightprobes (no Lightmaps). How can I do that?

I tried the Lightmapping window. But it seems to not want to just bake the probes. Even if I choose “Bake Probes”. It ignores everything and makes the lightprobe black (I think).

What am I missing?

Using Unity Pro 4.3.0

2

Ok the problem seems to be the shader. Which was a small custom fragment shader.
It seems to work with the built in emissive shader (no lights in the scene)

3

Now this is confusing. It works with the built in shader, but it doesn’t work if I compile the shader myself (with the source from here: http://unity3d.com/unity/download/archive/)
Should be the same shader. If I compile it myself it doesn’t emit into the Lightprobes. So no way to find out how to write a shader that emits into lightprobes?