Developer Notes

This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.


In order to use the 'Wind' material function correctly the function states you need to reference the 'Wind Directional Source' actor. The only way to do this within the material editor and through blueprints would be to convert the vector4 to a parameter, and call this parameter through blueprints.

The documentation does state "in development" so I am unsure if this is still the case or not, but the 'Wind' function will accept a plain Vector4 with no problems. As soon as you convert the Vector4 to a Parameter, an error message appears in the stats window stating, "[SM5] Function Wind: Cannot cast from float3 to float4.

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Won't Fix
ComponentUE - Rendering
Affects Versions4.7.64.14
CreatedMay 5, 2015
ResolvedFeb 17, 2017
UpdatedJul 14, 2021