Version: 2018.3 (switch to 2019.1 )
Implementing Fixed Function TexGen in Shaders
Particle System
Other Versions

Particle Systems reference

This section contains reference information for the Particle System component and each of its numerous modules. There is also a sub-section covering the legacy particle systemA component that simulates fluid entities such as liquids, clouds and flames by generating and animating large numbers of small 2D images in the scene. More info
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implementation used in earlier versions of Unity.