In this exercise you will create a shape using an ElevationGrid node from scratch. Later you will modify the ElevationGrid to add per-vertex colors.
In visualization, real and mathematical surfaces are often computed on a 2D regular grid. Calculated values are mapped to heights above the grid, creating mathematical Elevation Grid. Similarly, Elevation Grid surfaces can be created using real-world elevation information for parts of the Earth.
This exercise focuses upon use of ElevationGrid and Color nodes.
HINT: Notice that there are 4 values in the x dimension and 4 values in the z dimension.
HINT: To enable VRML to draw both sides of the ElevationGrid, specify a "solid FALSE" field and value.
Use the following color values: