How to convert Inventor
to Collada?

Inventor

Part or object created with Autodesk Inventor, a program for designing three-dimensional prototypes; is composed of one 2D or 3D object that can be combined with other parts in an assembly (.IAM) file.

Collada

Collada (COLLAborative Design Activity) is an interchange format for interactive 3D applications. Originally developed by Sony Computer Industry, now it is managed by the Khronos Group, a member-funded industry consortium, which now shares the copyright with Sony, Recently Collada has been well adopted by ISO as a publicly available specification, ISO/PAS 17506.

It is an XML-based schema that allows data exchange among 3D Digital Content Creation tools, such as SketchUp, Maya, 3ds Max, and Rhino. COLLADA files have the *.dae file extension, which stands for digital asset exchange.