How can I make a convex object?

Hi. So, I was wondering how I would be able to make a bowl shaped object. I'm trying to make a Beyblade stadium. Any ideas on how I could do this? Thanks in advance.

 

You'll need a modelling program such as Blender to create non-primitive game objects. It can take a while to learn the basics but there's plenty of help on the forums. It's worth the effort.

Here's a (very) simple low-poly example project to get you started...



Project Download
Blender Project & FBX model