The models on Sketchfab work very well with FWsim, and many of them are created from real photographs. You can find a list of supported file types below. Physically based rendering (PBR) models are not supported. However, certain restrictions apply: You must pick models that have relatively low polygon count (also called “low poly”). FWsim allows you to import many of these 3D models, and then place your fireworks around them or on them. Many places on the internet allow you to download 3D models.