Heighmap + Bump Map Tutorial

Process to add detail of a bumpmap to an existing heighfield with World Machine


1.  Write down the following values of your heightfield: (Can be found in L3DT under Operations > Heightfield > Change Vertical Range)
	a = Minimum Altitude
	b = Maximum Altitude
	c = Full Altitude range
	d = Cell size/Horizontal Scale
	e = Heightfield resolution
	f = Heightfield scale (Can be calculated manually with: d * e = f)
	g = Bump map detail depth (in meters)

	(Replace these letters with their corresponding values in the following steps, if that wasn't obvious)


2.  Create a new world machine project and set the project settings as follows: (World Commands > Project World Parameters)
	- Start with the third tab: (General Setup)
		- Set 'Dimensionality to' Kilometers
		- Set 'Maximum Elevation' to 'b'
		- Set 'Base Elevation' to 'a'


	- First tab: (Render Extents ....)
		- Width: 'f' (In KM)
		- Height: 'f' (In KM)
		- Normal Build Resolution: 'e' (You can set this lower initially for testing purposes)


3.  Create 3 new 'File Input' devices: (Devices > Generators > File Input)
		- File Input #1:
			- File details:  Load your bump map image that you want to apply
			- Width: 'f' (In KM)
			- Height: 'f' (In KM)
			- Altitude Scaling: 'Specific Elevation Range'
			- Elevation Span: ['a'] to ['a + g'] (You want the bottom of the bump map at the bottom of the worldspace, and it's max height at whatever your detail depth should be.)

		- File Input #2:
			- File details:  Load your heightmap. (Not in image/raster format)
			- Width: 'f' (In KM)
			- Height: 'f' (In KM)
			- Altitude Scaling: 'Specific Elevation Range'
			- Elevation Span: ['a'] to ['b'] (Same as using full range option)

		- File Input #3: (Optional)
			- File details:  Load your mask image
			- Match the rest of the settings to the main heightfield file input


4.  Create 1 'Constant' device: (Devices > Generators > Constant)
		- Height: ['a + g'] (This is so you can subtract this amount of the terrain so it's elevation stays the same as it was on input)


5.  Create 3 'Combiner' devices: (Devices > Combiners > Combiner)
		- Combiner #1:
			- Connect 'File Input #2' primary output to the top input of the combiner
			- Connect the constant's only output to the bottom input of the combiner
			- In the device's settings, set the method to 'Subtract
			- Set the strength to 0.50000

		- Combiner #2:
			- Connect 'File Input #1' primary output to the top input
			- Connect 'Combiner #1' output to the bottom input
			- Method: Add
			- Strength: 1.00000

		- Combiner #3: (Controls the strength of the bump-mapping with strength value, also use with mask, optional)
			- Connect 'File Input #2' primary output to the top input
			- Connect 'Combiner #2' output to the bottom input
			- Method: Average
			- Strength: 0.50000

6.  Create a 'Height Output' device: (Devices > Outputs > Height Output)
		- Connect 'File Input #2' bottom output (File Metadata) to bottom input
		- Connect 'Combiner #3' (Or #2) output to top input
		- Edit export settings


(What my final layout looked like: https://i.imgur.com/xFW2MUV.png)

7.  Build and write output to disk (Once results are satisfactory of course)


My results:
	Bump map used: https://i.imgur.com/asYKRNt.png
	Before: https://i.imgur.com/kEsNhUs.png
	After: https://i.imgur.com/mD8ezml.png