I am playing around with the smoke simulator, and made some effects that I think looks cool. But when I try to render it I see the domain box, not the smoke. I have tried making the box transparent but then I only see the “flow object”. How do I render it correctly???
you need to set the domain object material to volume and turn density down to 0 and set the texture to voxel Data. in the voxel data panel select the domain object as the domain cube and influence check the density check box.
Render your smoke in your scene in BI as a series of PNGs set to RBGA. Render shadow pass as well. In a separate file with the same geometry render everything else without the fire/smoke in Cycles, putting flickering lamps where the fire would be. Then, in the compositor, add your Cycles footage, then load the PNG sequence for your fire/smoke and then your shadows. Multiply the shadow pass, and alpha over the fire/smoke pass.