## Crust Mode

### Left click:
The replacer changes visually adjacent nodes (of the same type) on a surface 
![crust_left_click_0_015353](https://user-images.githubusercontent.com/161979/96197649-02496a00-0f53-11eb-9538-d809689d51fb.png)
Before is depicted above and after is below.
![crust_left_click_1_015402](https://user-images.githubusercontent.com/161979/96197651-02e20080-0f53-11eb-9e72-f1ccecceb09c.png)


### Right click:
The replacer places nodes onto the surface so that the surface below it is hidden; the added crust can be bounded by other solid nodes but not translucent nodes.

![crust_right_click_0_143612](https://user-images.githubusercontent.com/161979/96177419-28a8de80-0f2e-11eb-8c28-15caa3ea9335.png)
Before is depicted above and after is below.
![crust_right_click_1_143622](https://user-images.githubusercontent.com/161979/96177422-29417500-0f2e-11eb-955c-fcc3213733fd.png)

