Available primitives are cubes, spheres, capsules, cylinders, cones, and planes. They can be created as either MeshInstance3D, or CSG (but no csg planes or capsules).

They may be matched with either a flat color, or custom material, as well as optionally coupled with CollisionShape3D nodes, and parented with RigidBody3D, CharacterBody3D, or StaticBody3D, Area3D, or Node3D.

To add, simply click the buttons, or drag off the button directly into the viewport!