Dynamic Block Creation (Flip)                                                                                          

1. Add Flip Parameter:

Click the "flip" parameter button; add the flip parameter according to prompt.

2. Add Flip Action:

Click the flip action button on the action panel, match parameter and object for the action. Herein, we choose "roughness" as the object, and position the action button.

Use the same method to add a pair of flip parameter and action of the vertical direction.

3. Test Dynamic Block:

As you can see, after add flip parameter, if only click flip grip, you can turn the characters to the correct direction.