Terragen is the name of the shareware landscape builder, I believe. As I recall, it could export in DXF. I'm not sure where the site is. One thing you could do is make the object in Bryce, render an image of it, and load the image as a background picture into poser while you adjust the pose. That would enable you to make sure the figure's feet clear the bump and land in the right places. Then you could drag the figure into Bryce with a multi-frame OBJ export.