Manually add / remove objects to / from recast graph during editor scan

[ToastyStoemp]

I agree that more methods throughout the scanning process should be made virtual.
I personally made so many changes to the core grid generator code that each update is a pain in the butt.

Make CheckHeight and Check Collisions Virtual

Hey, While trying to work on a more package / module oriented expansion for A* I kept falling back to changing core logic. Especially the code for checking height and collisions. Many of the features would rely on Tag manipulation during the scan phase. I think the project could benefit from exposing these. Customizing the existing graphs would be much easier.

Let’s hope that future updates allow ease of customization to the system