The HeightFieldShape is a collision shape that can be used to represent a static terrain for instance.
You can define a heightfield with a two dimensional grid that has a given height value at each point. In order to create a HeightFieldShape, you need to have an array with all the height values of your field. You can have height values of type int, float or double. You need to give the number of rows and columns of your two dimensional grid.
notes: the height values in your array must be organized such that the value at row indexRow and column indexColumn is located at the following position in the array:
heighFieldValues[indexRow * nbColumns + indexColumn]
Morevover, you need to provide the minimum and maximum height values of your height field.
r3d.HeightFieldShape.new creates a new collision height field shape