Making a world editing program is quite easy. First of all, you want to have an array which contains one spot for each vertex on the matrix, and one spot to contain the height value.
Mathematically calculate using the width/height of the matrix and how many grid squares there are to find out where each vertex is, and place a cube at one of those points to use as your pointer object. Move it around, and when it is on a vertex, use up + down to modify the information in the array (height data)
Write all your vertex heights to a file, then use a for-next loop to read them. Voila
RPGamer

Check out our Team Request in the Team Request section if you want to help!