I have 2 render layers, one with the main object and one with a particle field (volume). If merged, the main object would be somewhere in the middle of the particle field. This means that some particles are in front of the main object and some are behind it.
Now I'd like to do some glare and blurring on the particles and then Z combine them with the main render layer. However, glare is not visible for some reason. If I disable "Use Alpha" on the Z Combine node, not even blur appears to be working.
Current node setup and result, neither of the glare nodes has any effect on the composite:

Could I achieve the same by using one render layer and object ID masks?
