The IGESBrowser is a browser for watching CAD documents storaged as IGES or STEP format, It Contains the following features:
• based Vulkan API provied more performance to rendering complex CAD scene.
• used PBR lighting model, allowing users to switch environment lighting.
• created by Document-Based app model, providing a thumbnail system.

about IGES:
The Initial Graphics Exchange Specification (IGES) is a vendor-neutral file format that allows the digital exchange of information among computer-aided design (CAD) systems. It's an ASCII-based textual format.

about STEP:
ISO 10303 is an ISO standard for the computer-interpretable representation and exchange of product manufacturing information. It is an ASCII-based format. Its official title is: Automation systems and integration — Product data representation and exchange. It is known informally as "STEP", which stands for "Standard for the Exchange of Product model data". ISO 10303 can represent 3D objects in Computer-aided design (CAD) and related information.