Keeping it simple, i have hair in max that uses only an opacity map with just white color, no mapping for the base material. It looks good as a screen capture but loses it as an Arnold render. But… in D5 where it is livesynch, i give the hair D5 opacity mapping and only fill in the opacity map…leaving the hair the default D5 white. I am uploading the D5 render then screen capture from max, then the 3ds max render
.