Thanks Richard - that’s exactly what I thought should work, but for the fluid domain it doesn’t work for me.
I’m using Blender 2.64. I pause on the fluid animation frame I’m happy with, select the fluid domain (I’m in wireframe mode), then as you say - I check “selection only” and export to a 3ds file (or dae). No errors. When I try to import into Sketchup it says “Can’t insert empty component”. Autocad just doesn’t insert anything.
If I try the same process with a different object, everything works perfectly - so it seems the fluid domain has some property that is preventing it from exporting. I’ve tried duplicating the domain, adding a “Remesh” modifier and applying it. Then trying to export - but no luck.
Any other suggestions? I’m new to Blender, so you might need to explain it slowly and loudly.