def loadTerrain(name, widthScale = 0.5, heightScale = 10.0):
"""load terrain stuff"""
global app, terrain, terrainRootNetPos
steerMgr = OSSteerManager.get_global_ptr()
terrain = GeoMipTerrain("terrain")
heightField = PNMImage(Filename(dataDir + "/heightfield.png"))
terrain.set_heightfield(heightField)
# sizing
environmentWidthX = (heightField.get_x_size() - 1) * widthScale
environmentWidthY = (heightField.get_y_size() - 1) * widthScale
environmentWidth = (environmentWidthX + environmentWidthY) / 2.0
terrain.get_root().set_sx(widthScale)
terrain.get_root().set_sy(widthScale)
terrain.get_root().set_sz(heightScale)
# set other terrain's properties
blockSize, minimumLevel = (64, 0)
nearPercent, farPercent = (0.1, 0.7)
terrainLODmin = min(minimumLevel, terrain.get_max_level())
flattenMode = GeoMipTerrain.AFM_off
terrain.set_block_size(blockSize)
terrain.set_near(nearPercent * environmentWidth)
terrain.set_far(farPercent * environmentWidth)
terrain.set_min_level(terrainLODmin)
terrain.set_auto_flatten(flattenMode)
# terrain texturing
textureStage0 = TextureStage("TextureStage0")
textureImage = TexturePool.load_texture(Filename("terrain.png"))
terrain.get_root().set_tex_scale(textureStage0, 1.0, 1.0)
terrain.get_root().set_texture(textureStage0, textureImage, 1)
# reparent this Terrain node path to the object node path
terrain.get_root().reparent_to(steerMgr.get_reference_node_path())
terrain.get_root().set_collide_mask(mask)
terrain.get_root().set_name(name)
# brute force generation
bruteForce = True
terrain.set_bruteforce(bruteForce)
# Generate the terrain
terrain.generate()
# check if terrain needs update or not
if not bruteForce:
# save the net pos of terrain root
terrainRootNetPos = terrain.get_root().get_net_transform().get_pos()
# Add a task to keep updating the terrain
app.taskMgr.add(terrainUpdate, "terrainUpdate", appendTask=True)
#
return terrain.get_root()
