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  1. Hi, beginner here. I have a scene where I want a smoke pyro effect to billow out from under a car bonnet, but have run into a few problems. The mesh is all modelled in maya, exported using Alembic and then imported into Houdini. I've made sure the normals are all correct, the mesh is clean and is acting as a static object. The problem i'm having is any smoke that I produce underneath the 'bonnet' mesh passes right through without being effected. I've tried with both volume based collisions and non, and the problem persists. I've become aware that perhaps the problem is because the mesh is too thin and scaling the mesh up does actually fix it, but i'd prefer to keep the mesh at its current size as it already has camera's set up to it's scale for compositing. Any ideas? Appreciate your time.