Mesh upload -- openings in mesh get closed -- why?

[ElectricSheep Expedition]

When I create a mesh with an intentional opening (like an archway) in blender (2.8) and upload it using the standard SL upload model modal dialogs, the arch gets closed in.

No combinations of parameters seem to be able to fix this.

I know that some mesh makers have been able to solve this as there are many houses where you can walk into a house (for example).

In the attachements, one can see the archway in blender and after upload to SL where the opening is impenetrable

Anyone able to help?

[Wulfie Reanimator]

You need to create (and include) a separate physics shape. Otherwise SL will just generate a convex one for you.

A physics shape is just another model. It should be as absolutely simple as possible. Export it separately from the original model and select it "from file" in the uploader's physics tab. 

Also, the object's physics type needs to be set to "prim" in order to use the custom physics model. 

Edited August 3, 2020 by Wulfie Reanimator

[ElectricSheep Expedition]

Thanks Wulfie Reanimator!
That certainly solved the problem

Would you believe that I simply forgot to set the object's Feature-->Physics Shape Type = "Prim"

What a noob mistake! Fixed now~