# Other common issues

## How to draw grass on the selected face?

Hold Shift to lock the selected faces. Then when you use the brush, it will only draw within the selected faces.

If you are using the Scatter tool, when you hover the mouse over the material you want to scatter, the material will be highlighted, and you can click to scatter it within the selected faces.

### Why can't I scatter grass/generate grass on the model?

Please check the model face before scattering/using grass material template. The scattering tool and the grass material template generation are only available for the front side of the model.

In Sketch Up

<div align="left"><figure><img src="/files/BXx1brZJLJuipuQ8qbz9" alt=""><figcaption></figcaption></figure></div>

In D5

<div align="left"><figure><img src="/files/wWa2rbUOGd9AchViycDq" alt=""><figcaption></figcaption></figure></div>

### Why is the effect abnormal when characters with different speeds are placed in the same path?&#x20;

This is a known issue with the current version. We will continue to optimize the solution for this scene in subsequent versions.&#x20;

Current suggestion: Don't put characters with obviously different speeds in the same path.

> For example, if a cycling character & a walking character are placed in the same path at the same time, the speed of the walking character will be abnormal; Current suggestion: use cycling characters separately.

<figure><img src="/files/X01uEy8QiFNm7EZfIV5T" alt=""><figcaption><p>cycling character &#x26; a walking character used in the same path</p></figcaption></figure>


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