Final answer:
Solidworks Visualize is the Solidworks add-in that helps produce photorealistic rendering of a part and its assemblies.
Step-by-step explanation:
The Solidworks add-in that helps produce photorealistic rendering of a part and its assemblies is Solidworks Visualize. Solidworks Visualize is a powerful tool that allows users to create realistic renderings of their designs, giving them the ability to showcase their products or designs with high-quality images and animations. This software has many features including realistic lighting, materials, and textures that can enhance the visual presentation of the designs.