A product level Gaussian model plugin

LiveDemo
The first three .spz format models before the button showcase examples of **product**, **indoor architecture**, and **outdoor architecture**. At first glance, these models appear no different from traditional mesh models. In fact, they are Gaussian models generated from renderings, using the same method as generating Gaussian models from photographs. The plugin also supports other traditional Gaussian formats as well. For more details, please refer to the **Gumload** introduction.