Takes an input raster (Esri file geodatabase raster in this case) and translates it into a text file for import into Vue Infinite. See my gist called load-terrain.py, as it's related.

raster-to-text-vue.py

def translate_z(in_val, no_data, max_elev, min_elev):
    """ Takes elevation Z values from raster and converts them to their
        equivalent value on a scale of 0 to 1, where 0 is the minimum elevation
        value of the raster dataset and 1 is the maximum. First add the min_z 
        absolute value to raster to bring lowest elevation value back up to zero.
        
    """ 
    if in_val == no_data:
        new_val = 0
    else:
        new_val = ((in_val - min_elev)/(max_elev - min_elev)) * (1 - 0) + 0
    return new_val    

def raster_to_text(in_raster):
    """Write out a raster to text file for Vue"""    
    out_text_name = str(in_raster).split("\\")[-1] + ".txt"
    out_text_dir = os.path.split(os.path.split(in_raster)[0])[0]
    out_text = os.path.join(out_text_dir, out_text_name)
    fo = open(out_text,"w") 
    # Slurp elevation values into a numpy array
    pt_array = arcpy.RasterToNumPyArray(in_raster)
    p = pt_array.tolist()
    # Reverse the list, because for whatever reason, Vue flip-flops the nested
    #   array values, which will give you a mirror image of your actual terrain
    p.reverse()
    # Get properties of the raster to use below
    rp = get_raster_props(str(in_raster))
    new_list = []
    for each in p:
        new_inner_list = []
        for every in each:
            new_inner_list.append(translate_z(every, rp["no_data"],
                                                   rp["max_elev"],
                                                   rp["min_elev"]))
        fo.write(str(new_inner_list).strip('[]') + "\n")
    fo.close()
    return out_text_name