C++ based 3D object and image handling application

We are looking to have an C++ application, which runs under Windows based systems. It should be able to load external images and 3D files (Google Sketchup and Collada) into borderless windows inside the main application, and then the user should be able to move and scale these by using controls outside of their window. The 3d contents should be rotatable and scalable in inside. The loaded object's z-depth should be changable. Another requested part is a simple pen tool, which only capable of draw with a simple colored dot. This layer should be also have a changable z-depth. As it will be a part of an existing project, we will need all the source files. Also for the same reason do not use .NET and/or MFC libraries.