How and where do you run the -d3d10 command to force UE4 to run on DirectX 10

Development Asset Creation
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1

I think you have to add this line to the shortcut for the engine in the “Target” field.

2

I’ve been told you can run UE4 on DirectX 10 if you run -d3d10 on the command line, but where is the file to run it, and how do you run it ?

3

Wasn’t this deprecated around 4.14-4.15? I mean the Shader Model 4.x not the command line.