Make Base (for triangulated height maps)
Makes the base below the 3D elevation map.
make_base_triangulated(tris, basedepth = 0, basecolor = "grey20")
| tris | A two-dimensional matrix, where each entry in the matrix is the elevation at that point. All points are assumed to be evenly spaced. | 
| basedepth | Default '0'. | 
| basecolor | Default 'grey20'. | 
| zscale | Default '1'. The ratio between the x and y spacing (which are assumed to be equal) and the z axis. For example, if the elevation levels are in units of 1 meter and the grid values are separated by 10 meters, 'zscale' would be 10. | 
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