Larger values will give the appearance of gusts moving across the landscape, smaller values will make plants look as though they are all moving chaotically which is less desirable. Press play and the grass will start animating. For a 400-frame animation, we used a Phase value of 10. The larger the number, the faster the grass will animate. Now increase the Noise map's Phase value. Change the default curve type to Linear so that you don’t create an ease-in or ease-out effect for the wind. Move the playbar to the end of the animation and enable Auto-Key. Open the Material Editor and create an instance of the Noise map. With that done, enable Map control for the Y-Axis and click on the Map slot and add a standard Noise map. These two values will represent the minimum and the maximum angles that the grass will use for its wind animation. Leave the X and Z values at their defaults but increase the range between the Y values. To animate the grass, go to the Transform rollout and enable Rotation Randomisation. You can use any models, but for this technique, you'll need to use individual plants rather than clumps of grass since we’ll be animating their rotation. To illustrate, We used 3 models from The3DGarden Field Plants and Grasses collection. In this tutorial we’re going to demonstrate a very simple technique that you can use to create the effect of grass blowing in the wind, even when you don’t have source models that include any animation.
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