7 Replies Latest reply on Aug 29, 2012 8:15 AM by Rick Gerard

    How to tilt the camera

    federatedfilms Level 1

      I have a 3D scene with the camera moving through it on the Z-axis starting at 0 and moving through to about 4,000 using the standard technique of linking a null object to the camera for easier control.

       

      The camera moves through a series of layers of vector images of a simple man and woman design, as the camera passes between them more people are revealed showing a family tree over time.

       

      The simple Z-axis move through the crowd is ok but I would like the camera to rise up above their heads and tilt down at a 45 deg angle as it tracks through them. I just can't figure out how to do this. I've played with the X rotation paramter combined with the Y position paramter to move the camera up and over their heads but I can't get it to tilt down at say a 45 deg angle as it moves along the z-axis.

       

      Example of the current tracking shot shown here

       

      Thanks

       

      Kevin

        • 1. Re: How to tilt the camera
          lasvideo Level 4

          I like to tap the "C" key which allows me to cycle thru more intuitive Camera controls (with the mouse)  the the Rotate XYZ options in the Cam Transform area.

           

          Go to the beginning of your timeline. Reveal all the Camera Transform  options. Turn on Keyframes for them all (just in case)

           

           

          Move your timeline to a point where you want to Move Up and Tilt Down. Tap "C" and use the interactive mouse controls to pose the Cam. Since all attributes are already keyframed, they will be automatically created when you position the Cam with the mouse controls.

          • 2. Re: How to tilt the camera
            Fuzzy Barsik Level 4

            If you are using Two-Node Camera, you should not forget about Point of Interest.

            For One-Node Camera manipulating Y Position and X Rotation or Camera Orientation should be enough...

            • 3. Re: How to tilt the camera
              lasvideo Level 4

              Good point Fuzzy.

              • 4. Re: How to tilt the camera
                federatedfilms Level 1

                Thx lasvideo, using the mouse controls via the C key was better and I managed to get my title!

                 

                I'm still at quite a loss to what all the variables are doing, what is the difference between manipulating the cameras Point of Interest over it's position? And why does the camera flip round if I move it's Z paramter beyound zero?

                 

                So can anyone recomend a good tutorial on 3D camera work that goes beyound the usual just link a null object to move the camera, one that really explores how to do more complex movement

                • 5. Re: How to tilt the camera
                  Andrew Yoole MVP & Adobe Community Professional

                  With a 2-node camera, the camera ALWAYS faces the Point Of Interest (POI). 

                   

                  The camera Position is the space the camera sits in the "world". 

                   

                  The POI is the point within that "world" that the camera lens is pointing to.

                   

                  If you move the POI downward in Y space, the camera will effectively rotate downward to follow it - but that rotation will not be represented in the camera's rotation parameters.  The camera's rotation parameters wil be ADDED to whatever the POI forces the camera to do.

                   

                  If the camera passes the POI in Z space, the camera instantly flips so that it is still oriented towards the POI.  If the POI is confusing you, just switch it off in Auto Orientation settings and work with a one node camera until you get the hang of it.

                  • 6. Re: How to tilt the camera
                    lasvideo Level 4

                    Your welcome FF. Andrews statement does a great job of explaing the idea of a 2 node camera. This can be turned off in favor of a 1 node camera. which has no  POI (point of interest) function. Play with each to see which you prefer.

                    • 7. Re: How to tilt the camera
                      Rick Gerard Adobe Community Professional & MVP

                      When doing complex moves with AE's 3-D camera I always put my camera on a dolly. I also attach the point of interest to another null. This makes complex moves much easier. It also provides a way to easily animate the focus and the point the camera directly at what you want to point ot at by animating the position of the POI null.

                       

                      Here's a screenshot of a simple timeline setup. The two 3D nulls are named Dolly (at the camera position) and POI (for point of interest)

                       

                      Screen Shot 2012-08-29 at 8.13.35 AM.png

                       

                      Here is the animation preset that I use to tie the camera's point of interest and focus distance to the POI null. The expressions work with or without parenting.

                       

                      The camera Point of Interest expression:

                      poi = thisComp.layer("POI");
                      fromWorld(poi.toWorld(position))
                      

                      The camera Focus Distance expression:

                      C = thisLayer;
                      POI = thisComp.layer("POI");
                      cp = fromWorld(C.toWorld([0,0,0]));
                      fp = fromWorld(POI.toWorld(position));
                      length(cp, fp)
                      

                       

                      This technique makes animating a camera a lot easier.