terrain_cb_w_4lyr_pxm and terrain_cb_w_4lyr_2tex_blend_pxm_spm added. These were pretty complex to port into ZModeler.
both use four packs of textures (diffuse + bump + height) blended via per-vertex green/blue channel (first shader) or via lookup texture on UV#2 (second shader).
Textures are blended as
#1 = no green, no blue
#2 = blue only
#3 = green only
#4 = both green and blue.
no config script for these pair of shaders yet.
Will inspect trees_lod/trees_lod2 crash this weekend.
Also, grass_fur_mask shader is used on separate models bh1_46_furgrass_south0*.ydr, which are overlay for ground polygons.