If you obtain a model with thousands or even millions of faces it should be simplified before import into Unity because that is unnecessarily too large. Especially for AR applications on mobile devices, you do not want (or need) such complex models.
Blender is a free and open source 3D creation tool. We use it for editing 3D models and animations. It also provides a full suite of additional features including simulation, rendering, and even game creation. https://www.blender.org/.
We cannot go into much detail here, but briefly, for example, using Blender you can simplify a model as follows:
- If necessary, download and install Blender from https://www.blender.org/ website.
- Open Blender and delete the default objects ...
