Image courtesy of Marcin Jastrzebski
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As this primitive is made of straight segments of a cone, the number of Points per Blade define the number of straight cone segments in each blade. You may determine the number of segments you need depending on how it looks from your camera view. The more segments, the smoother the cylindrical blades will look, but you will also increase the demands of RAM usage that is needed to render your scene.
Cylinder primitive using 16 points per blade
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Several MaxwellGrass modifiers being applied on the same ground geometry (screenshot from Studio)
Two independent grass modifiers applied together to the same ground geometry (hidden here) to create a more natural look by generating a mix of two different grass species
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The rest of the angle parameters will be applied after this main growing parameter; so the Initial Angle will mean a deviation from this main growing direction, as well as the Initial Angle Variation.
Example of grass with setting Grow Towards World-Y = 50%. Notice how the blades of grass in the slopes lean up.
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You can use an RGB map which will define the initial angle. The Red, Green, Blue channels in the map correspond to the X, Y, Z axis of the blade. Using a map allows you to make some interesting effects such as crop circles or wavy grass moved by wind. You can create a direction map in an image editor. The Initial Angle parameter is irrelevant when using an Initial Angle map, but the Initial Angle variation still applies, allowing you to add some randomness also when using an angle map.
*note that for the Green channel the lowest value considered is 128, since the blade can't start growing at a negative angle to the surface normal.
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The Cut Off feature allows you to cut the grass as if it were mowed, producing and abrupt cut.
Different values for Cut Off
Cut Off
The length of the blade (in percentage) at which the blade will be cut. The blade grows as usual until this point, after which it will be cut. A value of 100% will let the blade to grow up to its nominal length (no cut at all), while a value of 0% will cut the blade at its very birth (at zero length).
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The number of blades per meter you wish to have when the Max Distance is reached.
In this example, between 0-2 meters from the camera, the full amount of blades will be rendered. Between 2 - 8 meters, their number will gradually diminish from 100% to 15% (until 8 meters from the camera is reached). After 8 meters and further, only 15% of the blades will be rendered. Click to enlarge the image
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Adjusting the grass display settings to display just 10% of the generated fibers in the viewport (screenshot from Studio)
Tutorial by MaxwellZone
This tutorial shows you how to create presets for the grass extension. These presets will show up in the 'Preset' dropdown in the Grass extension, allowing you to quickly recreate a certain look."