Enabling Streaming Virtual Texturing in your project

To enable Streaming Virtual Texturing, you need to enable Virtual Texturing in your project. To do this, go to Edit > Project Settings > Player and enable the Virtual Texturing setting.

Virtual Texturing is a project-wide setting that is shared for all platforms. You cannot build a player for platforms and graphics APIs that don’t support Virtual Texturing. Virtual Texturing can allocate resources such as buffers, even if you don’t use the feature in your project, so don’t enable Virtual Texturing if you don’t plan to use it.

When you enable Virtual Texturing in your project, Unity adds the following compiler directives:

• ENABLE_VIRTUALTEXTURES: C# define that evaluates to True if your project supports Virtual Texturing.
• ENABLE_VIRTUALTEXTURING: C++ and C# editor define that evaluates to True if Virtual Texturing is possible on the current build target.
• UNITY_VIRTUAL_TEXTURING: ShaderA small script that contains the mathematical calculations and algorithms for calculating the Color of each pixel rendered, based on the lighting input and the Material configuration. More info
  See in Glossary version of ENABLE_VIRTUALTEXTURES.

Note that these might be renamed in future versions of Unity.