Although your buildings will still be tapered unless you use extremely higher resolution there is a way to derive more detail and even isolate each individual structure for UV mapping. This entails using other software resources like Uvmapper Pro to select individual structures from the greater model and apply UV mapping.

 

From the imported heightmap Bryce will create a terrain based on the resolution you’ve set in the terrain editor. In order to gain access to the individual building structures you will need to export from Bryce to “.obj. format. Unfortunately Bryce creates very large meshes even when you set the export size to 64x64 resolution, which would ordinarily bring most machines to their knees depending on the size of the model. Here I’ve subdivided my heightmap so as not to choke my machine when importing as an obj file into Wings3D and 3D Studio Max from Bryce. See illustrations.