Thank for this solution, it works fine for me, but it’s not totally useful because it doesn’t work with version <4.15 when launching projects directly from the launcher or directly by clicking on the .uproject file.
Is there a solution to make the -D3D12 option added by default to all engine versions used by the launcher, or eventually in each project file (for exemple an option in the .ini or in the .uproject files) ?
thanks for your help