Grass

Vegetation vegetation.grass

A grass population: meadows and ground cover, mostly used as a Density mask for engine grass painting. Points are clumps. Outputs as for Trees.

Output with default settings, rendered by LibreTerrain.

Inputs

Port	Type
Terrain	Heightfield
Water	Mask	Optional
Snow	Mask	Optional
Allowed area	Mask	Optional
Occupied	Mask	Optional

Outputs

Port	Type
Density	Mask
Points	Points
Dead zones	Mask
Occupied	Mask
Water influence	Mask

Settings

Setting	Default	Range / options	Description
Species	grass		Name written with each point in exported point files (e.g. scots_pine), so import scripts can pick the matching mesh.
Coverage Mask port	0.8	0 to 1	Density where conditions are ideal. 1 packs plants as closely as Spacing allows.
Health	0.8	0 to 1	How well the plants cope with poor ground. Lower health leaves only the best spots covered.
Water preference	0.3	-1 to 1	Above 0 the plants seek water, below 0 they avoid it. Water is the Water input (e.g. a Wetness mask), or valleys if it isn't connected.
Spread	5 m	0 to 2,000 m	How far plants spread beyond the ground that suits them, in metres.
Patches	0.3	0 to 1	Groups plants into clumps and clearings. 0 = even cover.
Patch size	40 m	5 to 20,000 m	Typical size of clumps and clearings, in metres.
Randomness	0.3	0 to 1	Fine, random thinning of the cover.
Slope min	0 °	0 to 90 °	Plants grow on slopes between Slope min and max.
Slope max	45 °	0 to 90 °
Slope falloff	6 °	0 to 45 °	How gradually cover fades outside the slope range.
Altitude min	-10,000 m	-10,000 to 20,000 m	Plants grow between Altitude min and max, in metres.
Altitude max	2,200 m	-10,000 to 20,000 m
Altitude falloff	100 m	0 to 5,000 m	How gradually cover fades outside the altitude range (the tree line).
Avoid peaks	0	0 to 1	Thins cover on exposed peaks and ridge crests.
Snow tolerance	0.2	0 to 1	How much snow (Snow input) the plants survive. 0 = none.
Occupied	Avoid	Avoid, Intermingle, Grow near	How this population treats ground taken by earlier ones (Occupied input): keep out, share it thinly, or cluster around its edges.
Occupied strength	1	0 to 1
Dead zones	0.2	0 to 1	Clears scree slopes, their run-outs and snow-slide paths. Also an output, for placing rocks.
Dead zone slope	38 °	0 to 90 °	Slopes steeper than this become dead zones.
Spacing	2 m	0.25 to 1,000 m	Minimum distance between two points, in metres.
Rotation min	0 °	0 to 360 °	Each point turns by a random angle between Rotation min and max.
Rotation max	360 °	0 to 360 °
Scale min	0.6	0.01 to 100	Each point gets a random scale between Scale min and max (1 = the mesh as modelled).
Scale max	1.4	0.01 to 100
Seed	0	0 to 999,999	Change for a different variation.

Mask ports

Settings marked Mask port can be driven by a mask. Click the setting's Mask port button and connect a mask to the new green input: black scales the value to 0, white keeps the value you set.

See also

Debris / Rocks · Shrubs · Trees