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This tutorial covers using CommandBuffers, Tags and WithAll() to reduce the number of entities processed in some steps. Also using [UpdateAfter()] and [UpdateInGroup()] to set the systems updating order.
Build tested on entities 0.4.0 preview.10 & Entities 0.5.0 Preview.17 . Packages used are shown here
The source is at https://github.com/ryuuguu/Unity-ECS-Life.git . The Zip file of the project of this tutorial is at http://ryuuguu.com/unity/ECSLifeTutorials/ECSLifeTutorial3.zip.
Warning: DOTS is still bleeding edge tech. Code written now will not be compatible with …