Polycount refers to the number of polygons making up a 3d model. How many polygons are used to create the model determines how detailed and smooth it will look, but also how the computer may perform when displaying it. More polygons means more work for the computer, so this is important to keep in mind.

Here you can see how the number of polygons used to create a ring affects how smooth it appears, but also it's complexity.
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While there are multiple factors contributing to how a model may perform on modern computers, polycount is the most important one to keep in mind for stable performance. We generally find a max combined polycount of 20 million (TEMP!) to perform well on a top grade vr ready computer. And to be clear, that means for all models visible at a time, not max on a per model basis.

Taking into account what has to be done to make a single polygon, you may see that doing this for a few million polygons, for two screens (one per eye), 90 times a second is no small task. Our software is able to handle tens of millions of polygons, but what our software can handle is limited by the computing power of current day hardware, and limitations of real-time 3D rendering techniques. There always comes a point where it is too much for the computer to handle and will not be able to deliver a smooth VR experience.

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