triangle.net | Snapshot of Christian Woltering 's Triangle.NET | Game Engine library

I've looked through what seems like every question and resource there is for Triangle.NET trying to find an answer to how to insert a vertex into an existing triangulation. The closest I've gotten was in the discussion archives for Traingle.Net where someone asked a similar question (discussion id 632458) but unfortunately, the answer was not what I was looking for.

My goal here is to make a destructible wall in Unity where, when the player shoots the wall, it will create a hole in the wall (like in Rainbow Six Siege).

Here's what I did for my original implementation:

1. Create initial triangulation using the four corners of the wall.
2. When the player shoots, perform a raycast, if the raycast intersects with the wall then add the point of intersection to the polygon variable and re-triangulate the entire mesh using that variable.
3. Draw new triangulation on the wall as a texture to visualise what's happening.
4. Repeat.

As you can see, step 2 is the problem.

Because I re-triangulate the entire mesh every time the player hits the wall, the more times the player hits the wall the slower the triangulation gets as the number of vertices rises. This could be fine I guess, but I want destructible walls to play a major role in my game so this is not acceptable.

So, digging through the Triangle.Net source code, I find an internal method called InsertVertex. The summary for this method states:

Insert a vertex into a Delaunay triangulation, performing flips as necessary to maintain the Delaunay property.

This would mean I wouldn't have to re-triangulate every time the player shoots!

So I get to implementing this method, and...it doesn't work. I get an error like the one below:

NullReferenceException: Object reference not set to an instance of an object TriangleNet.TriangleLocator.PreciseLocate (TriangleNet.Geometry.Point searchpoint, TriangleNet.Topology.Otri& searchtri, System.Boolean stopatsubsegment) (at Assets/Triangle.NET/TriangleLocator.cs:146)

I have been stuck on this problem for days and I cannot solve it for the life of me! If anyone who is knowledgeable enough with the Triangle.NET library would be willing to help me I would be so grateful! Along with that, if there is a better alternative to either the implementation or library I'm using (for my purpose which I outlined above) that would also be awesome!

Currently, how I've set up the scene is really simple, I just have a quad which I scaled up and added the script below to it as a component. I then linked that component to a shoot raycast script attached to the Main Camera:

How the scene is setup.

What it looks like in Play Mode.

The exact Triangle.Net repo I cloned is this one.

My code is posted below: