Greg Hughes

Thanks everyone, I will try it.

I have created a smoke sim at SOP level. When I use a Merge node to combine the Pyro Solver output with a geometry object I am using as a collision object they show in the viewport together, but when I render (Mantra) the smoke does not show. Is it not possible to combine them in the same render?

I am trying to also render the collider geometry brought in to the Geometry level with a Object Merge node.

Would I need to render the geometry I am using for the collision object by using a separate Geometry node at Objects level so it renders with the Geometry node that holds the pyro sim (both Display flags activated - blue)? Will this method create the proper occlusion between smoke and geometry, or is there another step like using a Forced Matte in Mantra to occlude the smoke with the object? Would I need to render each separately and combine them in Nuke?

I can not see a volume in the viewport at the Dynamics level when using v.20.5.684 on Mac OSX, only at the Geometry level. When I use the Gas Axis Force node micro solver, only the widget shows at Dynamics level, although it does affect the simulation.

Would this be a bug or a limitation of the MAC OSX or some setting I need to change. It does show in v18.5 on a Mac, so it does not seem to be related to a Mac.

I had to upgrade from an earlier version to fix another viewport bug that was not recognising a light when using volumes. This version fixed that issue.