inventor-dev binary package in Ubuntu Focal amd64

 This package contains the files required to develop Open Inventor
 applications.
 .
 Open Inventor is an object-oriented 3D toolkit offering a comprehensive
 solution to interactive graphics programming problems. It presents a
 programming model based on a 3D scene database that simplifies graphics
 programming. It includes a large set of objects such as cubes, polygons,
 text, materials, cameras, lights, trackballs, handle boxes, 3D viewers, and
 editors can speed up your programming and extend your 3D program's
 capabilities.

Source package