I have been looking around for a file format that saves models as a collection of primitives (Boxes, Spheres, Cones, Cylinders, etc.). After some research, I came to the conclusion that pretty much every standard available file format saves models as a collection of vertices and indices (and some other stuff like UVs & materials).
Real world example
Why would one need a file format that saves primitives? Well, in my case, I am trying to build a game where I will need to import the physics separately. Since physics are optimized per primitive type, I would deem it wise to not just import everything as a mesh collider but make use of these optimizations.
For context, I am using Three.js with Ammo.js (Bullet) running server-side.
So the question really is, why is there no standard for this? Why isn't there a standard like SVG but for 3d models? I will probably end up writing my own format / implementation, so it's not like it's holding me back. It's just that I am a bit cautious, since I feel that there probably is a reason for no such standard to exist.
Here are some links I came across during research:
Since comments aren't for thanking people, I'll just do that here. Thanks to all of you that answered and commented, very insightful! Much appreciated!