The terrain looks better now.

The terrain 3D model data can be generated by Truespace.

What I am doing now?

It is a good chance to candidates who may learn about 3D graphic tools without any payment.

There are many free 3D graphic tools, such as, Google Sketch up, Blender, K3D, MeshLab, etc.

There is one more tool called Truespace which I recently have installed on my desktop. I could draw simple model mush easier.

And of course, I could get the model values using collada dae file format which is xml based text. The above shown picture is a simple plane map editer shows plane lands and fast speed of FPS, etc.