; Version 2.5 (20080209)
This will "thatch" a heightfield with a specified pattern. with the pattern rotated to line up "downhill"
If there is a selection, only the area within the selection will get thatched.
"Invert the heightfield" - unchecked expects high=1, checked will use high=black
"Select a thatch pattern" - the pattern to cover the surface with. It should really be a tileable pattern
"Pattern 'downhill' orientation" - "Right" "Up" "Left" "Down" reflects the downhill sloping direction of the pattern
"0 angle offset (degrees)" - adjust the lighting base angle, from 3:00, 0 to 360 degrees, ccw.
"Number of 'faces' to calculate" - The number of downhill directions to create
"Blending between 'faces'" - The number of pixels to blur and overlap each of the faces. This doesn't blur the waterline.
"Flat area strength" - Adjust how close to flat a section of the heightfield has to be to get the omni directional blend of the pattern. Set to 0 will use NO omni directional blend layer.
"Make 0 elevation transparent" - checking this turns the 0 elevation transparent in the final result. unchecked it will be considered as a flat area and get the omni directional blend
"Create a bumpmap layer" - check this to add a bumpmap layer in overlay mode on top.
"Lighting angle for bumpmap" - if the above is checked, the angle for the lighting.
"Create a softlight layer" - if checked, a "white high" copy of the heightfield will be added, at 50% opacity in softlight mode
"Merge thatching to one layer" - if checked, the resultant thatch image is merged down to one layer, otherwise all of the layers are left to allow manual adjustment. It doesn't merge the bumpmap or softlight layers, however.
"Create new image" - if checked, the thatch will be a new image, otherwise it will be new layers in the existing image.