Brushes won’t snap to a specific direction when using the perspective ruler.
By turning off ruler snapping of other vanishing points, you can make sure brushstrokes will follow a specific perspective ruler.
How to:
1. Select Object in the Operation tool.
2. Click a perspective ruler on the canvas.
3. Hover over the snap button, and click when the mouse icon turns into a finger.
4. The corresponding guide line will turn green, and snapping in that direction will be disabled.
* By default, rulers will be purple when snap is on, and green when it is off.