Impostors - Runtime Optimization - free downlopad asset for Unity.
Converts distant complex 3D objects into simple 2D quads which significantly reduces triangles and drawcalls count. That's all at runtime without any preprocessing!
Next generation of Imposter System asset with DOTS in mind.
When creating big worlds it's important to show users the large-scale scenes with lots of objects in the background. That's a tough task that requires optimizing shaders, materials, meshes, and so on.
With the help of Impostors, you can greatly simplify this task!
Impostor - fake object(quad), that tries to look like its original object. It's very cheap to render but with a trade-off between performance and visual quality.
To be honest, we don't really need high visual quality at distance, because distant objects take tiny space on the screen. That's why there are techniques like LODs (Level Of Details).
Impostors expand this approach, and in some cases can completely replace it.
There are several problems with LODs
it requires manually creating additional assets for each object - meshes with fewer polygons and materials,
these additional assets increase build size,
there might be a noticeable difference between LODs, which pops in and out when player moves.
Poping problem is really hard to solve because it's just the trade-off between performance and visual quality. But with Impostors we can solve the first two issues:
impostors don't require manually creating additional assets,
impostors don't increase build size,
in perfect scenarios impostors look exactly like the original objects.
How impostors work
The concept of impostors is quite simple. We just take a photo of the object from a specific angle, and then show this photo instead of the original object. Whenever camera changes its position we need to regenerate the photo to represent object from the new angle.
Again, we stuck with the trade-off between performance and visual quality.
Impostors are not a panacea and cannot replace standard rendering.
But it provides the opportunity to fill your scene with lots of distant details if your project fits several conditions.
When to use impostors
Before we continue with this chapter I want to mention: if you have any doubts or questions about impostors working with your project, feel free to contact me with some gameplay footage or at least a high-level overview of what is going on in your game. I will try my best to answer your questions and let you know whether Impostors fits you project.
Last note, Asset Store provides refunds, and I have never rejected refund requests, so you are covered.
Asset version: 1.0.3
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