There is a quite easy trick for this which was discussed in the Bryce forum. When you compose your scene, include a large cube to the back of your scene (either side). Then add another cube at the front of your scene on the opposite side. Make sure the cubes have exactly the same scale and orientation. Then, export your image as 2 (or whatever) obj files - including the cubes in each file. When you import into Bryce, you can use these two cubes as references to confirm position and scaling. Delete when finished. Paul