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  Autogenerating a NavMesh  (Read 497 times)
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Offline thedanisaur

JGO Knight


Medals: 59



« Posted 2016-11-04 17:08:19 »

Hey everybody, I'm a little stuck here. I have a preexisting terrain mesh that I want to generate a navmesh for. I'm currently basing my process on that fact that all of the edges should not be shared by other polygons and that I have zero obstructions on the mesh. So basically I'm expecting to see just the perimeter after the generation.

Here's the before mesh:
http://imgur.com/asbjZpx

Here's the after mesh:
http://imgur.com/cW52pvl

As you can see it's not quite what I'm expecting.

I'm getting all of the edges,
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ArrayList<Edge> edges = new ArrayList<Edge>();
      for(int i = 0; i < layers.size(); i++)
      {
         Layer layer = layers.get(i);
         for(int j = 0; j < layer.getVertices().size() - 1; j++)
         {
            Edge edge = new Edge();
            edge.setOrigin(layer.getVertices().get(j+0).getPosition());
            edge.setDestination(layer.getVertices().get(j+1).getPosition());
            edges.add(edge);
         }
      }

In the "layer" the vertices are duplicated and in index order, meaning that indices don't really mean anything and every three vertices is a triangle.

Anyway, then I remove the edges like so,
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for(int i = 0; i < layers.size(); i++)
      {
         Layer layer = layers.get(i);
         for(int j = edges.size() - 1; j >= 0; j--)
         {
            Edge edge = edges.get(j);
            int count = 0;
            for(int k = 0; k < layer.getVertices().size(); k += 3)
            {
               Vertex v0 = layer.getVertices().get(k+0);
               Vertex v1 = layer.getVertices().get(k+1);
               Vertex v2 = layer.getVertices().get(k+2);
               if((edge.getOrigin().equals(v0.getPosition()) ||
                  edge.getOrigin().equals(v1.getPosition()) ||
                  edge.getOrigin().equals(v2.getPosition())
                  ) &&
                  (edge.getDestination().equals(v0.getPosition()) ||
                  edge.getDestination().equals(v1.getPosition()) ||
                  edge.getDestination().equals(v2.getPosition())
                  )
               ) count++;
            }
            if(count > 1) edges.remove(edge);
         }
      }


edit: images...

Every village needs an idiot Cool
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