Terrain size and relief. Pixel brightness maps linearly onto minHeight to maxHeight (0 and 1 when omitted).
minHeight
maxHeight
Optional
world-space size along Z; defaults to 10
vertices per side; defaults to one per source pixel along the shorter dimension
world-space size along X; defaults to 10
Terrain size and relief. Pixel brightness maps linearly onto
minHeighttomaxHeight(0 and 1 when omitted).