Don’t Let Offscreen Objects Ruin Your Performance – Unity CullingGroup API – General and Gameplay Programming – Tutorials

Check the original blog post at The Gamedev Guru: Don’t Let Offscreen Objects Ruin Your Performance – Unity CullingGroup API

Learn how to make your expensive scripts cost nothing while they are offscreen.

Table of Content

Offwhat GameObject?

First off: what is an offscreen object?

An object is offscreen when you cannot see it from your camera’s perspective. This may happen because your object is “behind” your camera (therefore culled by frustrum) or behind walls/other occluders (occlusion culling).

So if an object is offscreen and we cannot see it, we don’t have to dedicate expensive computational resources to it right?

Wrong. That’s what I thought when I was a kid. Not anymore.

The Performance Cost(s) of Offscreen Objects

Here are some of the hardware costs you are paying for offscreen objects:

  • The culling price: is an object offscreen at all? Unity determines this by checking its visibility through
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Linear Interpolation Explained – General and Gameplay Programming – Tutorials

Linear interpolation is everywhere. Games, 3D animation, image creation tools and much more all rely heavily on interpolation, so having a thorough understanding of linear interpolation is extremely important.

This text is somewhat geared towards game developers, however it’s general enough to apply to any programming audience regardless of if you’re into games or not.

What is interpolation?

In the simplest sense, interpolation is finding data in between other data. Unfortunately, this explanation is really vague, and understanding interpolation is quite difficult without real examples, so I will provide some.

Linear Interpolation, and the Number Line.

Lets explain linear interpolation by using a number line as an example.

What number is halfway in between -2, and 2?

If you answered 0, you would be correct! Congratulations! You just did linear interpolation inside your head. (Yes, that’s all it is!) Going back to the original definition of interpolation as “finding data

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