Batch render different to Render Window

[cyberjunglist]

Hi All,

I've had a quick look through the forum so hopefully this isn't a repost,

Here's my problem:

I'm creating a coloured liquid from nParticles, the particle speed effects the incandesence so I converted the nParticles to a mesh.

Then I used the color set editor and a mentalRayVertexColor node to pipe the particle incandescence to the blinn incandescence.

When I render in the render view it looks exactly the way I expected. Happy days,

I wanted to render with mental ray so I could split the incandesence from the diffue and re-comp them later, however when I batch render the incandescence pass is rendered without any colour...

I'm rendering without any indirect light, to a 32bit EXR.

here is the render view
http://imgur.com/cicJZjW,JeYuzzS#1

here is the batch Render
http://imgur.com/cicJZjW,JeYuzzS 

I hope this all makes sense, any suggestions as to what is causing this or how to fix would be most welcome.

Thanks in advance 

[havock94]

Do you have multiple render layers?? It might be stupid but maybe you rendered only one of them...

[cyberjunglist]

Yes I have multiple layers, I rendered out all of them and all the others came out fine, the one with the particle effect was the only one that looked different,

When I render the layer with the particles in the render view it looks fine, it's only during batch render that it looks off.... 

ps. Thanks for the quick response!