It is useful to have a function that can return the height y of a point on the plane specified by (x, z).

• Setting objects so that they are placed on the ground
• Setting the camera so that it is always y units above the ground

One way to do this is to map between world coordinates [x, y, z] and the heightmap image.  

glm::vec3 MHeightMapTerrain::WorldToImageCoordinates(glm::vec3 p)
glm::vec3 MHeightMapTerrain::ImageToWorldCoordinates(glm::vec3 p)

Example provided on Moodle.

High