5 Replies Latest reply on Jul 25, 2016 10:44 PM by Roei Tzoref

    HELP needed to achieve this shadow effect

    wat d hell editor Level 1

      Hello all,

      I need your advise. sorry I don't know the name of this effect so below is the scene for which I need help

       

      A man is holding a torch light illuminating a girl in front (she is a bit far away from him in an open ground),now a shadow of another person walks in between the torch and the girl. The Shadow is  being casted from left to right end of the frame, falling on the girl too as it moves.

       

      How to achieve this effect in after effects.

      It may or may not be an amateur question, But any help would be so helpfull.

      Please advise

        • 1. Re: HELP needed to achieve this shadow effect
          Roei Tzoref Adobe Community Professional

          it's hard to understand EXACTLY what do you want to achieve from your explanation. if it's a scene you already setup in Ae, it would be helpful to show it, is it video on green screen, full frame video? what are we talking about here? make sure you show the composition window and the timeline. a video file will be even better. try as best as you can - the more accurate you illustrate your problem/situation - the more chance to get an optimal solution 

          • 2. Re: HELP needed to achieve this shadow effect
            wat d hell editor Level 1

            Totally understand, let me put this in a simplified term.

            I am filming a man walking in the ground, a light source is behind my camera, so the man's shadow is falling 90 degree flat on the floor.

            Now, I don't want the man to be there in my output but I just want his shadow alone moving. How can we do this?

             

            Is this possible to make a man walking front of the green screen and darken him and lower opacity and bring that keyed layer on the ground layer and turn the keyed layer flat like 90 degree?

            • 3. Re: HELP needed to achieve this shadow effect
              Roei Tzoref Adobe Community Professional

              now it's much more clear. you need VFX advice before your shoot. you need to have a shadow without the man being there. I think you can go 2 ways with this: shoot on location twice or go the green screen approach. each with it's own complexities and advantages and disadvantages. I will describe the basics:

               

              On Location Approach

              if you want to try to do this on location you can:

              1. shoot your scene with the man and the shadow

              2. shoot the same scene without the man and the shadow

              3. mask out the man with rotoscoping and tracking

               

              this could work if you have no movement in your scene. or if you have motion control rig that will shoot the same movement exactly twice.

               

              Green Screen Approach

              to your question - if you can key a person out and make him a shadow flat on the ground - YES. this is the way I would try to do this - it's called a Shadow Catcher - a layer that will only accept your shadow. this could work with or without movement in the camera.

               

              let's say you have this guy on green screen

               

              and you want just his shadow on this background

               

              these are the steps:

              1. make the guy (keyed layer) 3D and add a floor corresponding to the floor* in the actual shot.

              floor - you add a solid, make it 3D, add the grid effect and position it accordingly with adjusting a 2 node camera like this

               

              2. add a point  light layer and set it to cast shadow, set the keyed footage to cast shadow , and set the floor layer to accept shadow - only, and adjust the light

              now you got this:

              3. check that everything is o.k, now set the keyed footage to cast shadow - only

              now you got just the shadow. you can adjust it to taste with shadow darkness and diffusion in the spot light properties

              • 4. Re: HELP needed to achieve this shadow effect
                wat d hell editor Level 1

                Brilliant,  I can do this... Sincere thanks,

                You are the best.

                • 5. Re: HELP needed to achieve this shadow effect
                  Roei Tzoref Adobe Community Professional

                  Great! run some tests what ever approach you choose. and if you can, post the results good luck.