An object of volumetric material (relatively low density) shall only be affected by one specific spotlight. All the surrounding lights (sun, hemi etc.) shall have no effect on the object.
With other words: The material (volume scatter/absorption etc.) must be transparent to every light except for the spotlight.
You mention hemi, but I’ve never used Blender Internal. Unless someone else gives a proper answer, I’d just do it in composite (render the two setups separately) and adding them together. A blend file and images of what you’re trying to achieve also increases the chances of someone having a go.
You mention hemi, but I’ve never used Blender Internal. Unless someone else gives a proper answer, I’d just do it in composite (render the two setups separately) and adding them together. A blend file and images of what you’re trying to achieve also increases the chances of someone having a go.
You mention hemi, but I’ve never used Blender Internal. Unless someone else gives a proper answer, I’d just do it in composite (render the two setups separately) and adding them together. A blend file and images of what you’re trying to achieve also increases the chances of someone having a go.