1. Terrains
Creating an Island

2. Find a map that may contain an island.

3. Zoom in on an island in a map.

4. Paste it into GIMP.

5. Crop & convert to grayscale.

6. Duplicate the layer and work on the duplicate.

7. Note water depth is actually a negative value
Note water depth is actually a negative value. So we’ll set the land to be above sea level . . .

8. . . . by setting it to 36 (+5 above the deepest water value of -31).

9. But it’s difficult to distinguish between the values.

10. So we’ll use 100 for sea level (to spread out the values).

11. Make a table of values (using a linear relationship).
But keep the gray values between [0..255] inclusive.

12. Alternative: Creating binary terrains with Java
Use FileOutputStream for binary output. (System.out.println produces ASCII text output.)
Write a Java program that creates a file of 1000*1000 integer values in the range [0.255].
Be creative. You may wish to use sin, cos, tan, pow, etc.
Load your file into GIMP.
Send and print your program and a screen dump of the result in GIMP to me.

13. Extra:
Simply check your raw file in GIMP by creating a .pgm file. Add the following to your code right before you write out the raw bytes:
String s = “P5\n \n255\n";
Using the FileOutputStream, write out the above before you write any raw data.

14. Bring your new Terrain into Unity
Terrain --> Create Terrain
Terrain --> Import Heightmap – Raw
Then proceed working on Chapter 2: Environments in Unity Game Development Essentials.