Performance Settings

The following settings do not cause a recompile of the shader, unlike shader variants, but they still have an extreme performance impact.

Density Settings

The 4 density settings are the single most important settings in regards to performance and visual appearance.

• Target Density: This setting represents the maximum density of your grass. You should use the highest value where the material still looks good, in order to improve performance.

• Density Falloff Start: The distance after which grass density will start to decrease. Everything between the camera and this distance will have exactly the Target Density.

• Density Falloff Scale: Scales the falloff speed linearly. A higher value causes the density to decrease more quickly.

• Density Falloff Power: Scales the falloff speed non-linearly. A higher value increases the speed at which density increases.

The density falloff scales like this: $(s d)^p$, where $s$ is the scale, $d$ is the distance from the falloff start, and $p$ is the falloff power.

Don't use Target Density like an arbitrary slider. It should represent a specific maximum density. You should use a mesh with sufficient polygon density (or use mesh normalization on the mesh filter) and select a value that represents the density you want for your scene. When you follow this rule, you will prevent artifacts, make the material more predictable, and improve your visual appearance.

Low target density

High target density

Low falloff start

High falloff start

High falloff scale

Low falloff scale

High falloff power

Low falloff power

LOD Settings

These settings change how many polygons are used per blade of grass. This can be used to improve performance.

Fade Settings

These settings define at which distance the grass starts to fade into the ground. All blades of grass further away than Grass Fade End will not be rendered at all, which improves performance.