you have the option of choosing a format other than jpeg for the LW image maps when you export from bryce( tiff, .bmp and photoshop uncompressed-.PSD ) and you can export the terrain geometry in a variety of formats that can imported into the modelor such a .obj, .3ds . dxf all of which gives you the option of increasing the polygon count during export. Not that high poly count is that crucial since most mountain ranges are typically depicted in the hazy distance

My website

YouTube Channel