Not sure about Bryce 3D, but B4 and 5, import and convert the file all inside the computers ram. Not sure of your machines specs, but running out of ram while importing = error message. Here are some suggestions, I never used B3, but if it imports into it, can you save and export it as a Bryce object, through the create library? Since Bryce does not read other programs world coordinates, bringing it in, in pieces, can be done by creating a 2D plane in the modeling program. Place it at 000 XYZ, and make sure it encompass the whole model, ( nothing hanging over the edge when you look at it in top view), and the model is completely above it . Then select sections of the model and export them along with the 2D plane. Export the whole model in sections along with the 2D plane, ( keep the file size under 20MB for each section, ( if that's your problem size ) When you import each section into Bryce make sure your preference are set to ( create object at world center ). Bryce should then use the 2D plane as the size of the import and place it at world center. So each section when imported will fall into place. After all the section are imported, delete the 2D planes and group each of the model's sections together.

Stephen Ray