Clipping Problem with 3D Projection

#1

Hi,

I am attempting to project a matte painting onto a piece of geometery in order to use the 3D camera.

I have this set up so that a camera is projecting the image onto a plane at a certain frame and then the 3D renderer views this plane through the matchmove camera. This is working well, geometry is in the right place and everything is working as it should…except… The matte painting clips once it moves into the scene. I can only see the parts of the painting that are in view on the frame that the projection camera is set to. Once that bit is no longer full frame I see the unlight geometry. I know that the geometry is in the right place and the right size and I know that the painting is larger than what is scene on the projection frame.

Has anybody else run into this problem or have any ideas on how to fix it? I would appreciate any ideas anyone has.

Thanks

#2

The main issue is that a camera with a 0 clipping plane will be less accurate with the z buffer and determining what is closer to camera when rendering. This can cause all kinds of issues. Depending on the scale that your 3D app exports, it may be too small to fit neatly inside the Fusion’s 3D scale.

Sometimes you can scale a scene to get the clipping plane to operate closer to the geometry and get the final result, the trick is the order in which the scale takes place, and the way to get it to work is this;

  1. Copy the camera
  2. Insert a 3d xform tool, and paste the settings from the camera onto it.
  3. Remove the animation from the camera and 0 out each of the translations and rotations.
  4. Insert another 3d transform tool between the camera and the transform that contains the motion, and set it to scale down the camera.

This way the camera is scaled before the translations, and the clipping plane is reduced.

#3

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