hi, i recently discover the cutout feature on CPU particle for reducing overdraw : [229969-ue4editor-2018-02-08-15-13-01.png] It work fine with rgba texture, but i did not manage to make it work with Grayscale texture. I tried to change the Opacity Source Mode, but none works. Thanks in advance …

there is often no use for a grayscale texture. try setting its compression to alpha, that works for me.