Activity › Forums › Adobe After Effects › Alpha Matte doesn’t work when 3D layer is on… Adobe After Effects Alpha Matte doesn’t work when 3D layer is on… Posted by Amanda Chu on December 23, 2019 at 2:59 am Hi Professionals, I have a simple question: I have an Alpha Matte turned on but after I turned on the 3D layer, the Alpha Matte stops working. Here are two screenshots: Can anyone kindly advise me on how to adjust this tiny problem? I’m still pretty new to AE… Thank you so much!!! Amanda Chu replied 6 years, 4 months ago 2 Members · 3 Replies 3 Replies Greg Gesch December 23, 2019 at 3:30 am Hi. If I read you correctly you need to pre-compose the alpha matted text. Amanda Chu December 23, 2019 at 3:40 am Hi Greg, I pre-composed R layer, But the Alpha Matte still not working.. Amanda Chu December 23, 2019 at 4:19 am Hey Greg, thank you for the response! I did solve this problem by clicked off the Fast Draft button!!!! holy molly…almost three hours time!!!!! Reply to this Discussion! Login or Sign Up Public All Members My Connections Only Me PublicAll MembersMy ConnectionsOnly Me Public All Members My Connections Only Me Reply to this Discussion! Login or Sign Up