Fixing up a recast navmesh

General Recast graph
#1

I’ve been experimenting with Recast graphs to allow navigation on a level that includes stairs. I’ve been struggling with getting settings that worked for a particular set of steps from Synty’s Fanstasy pack. The graph would never seem to get to the top/bottom and would have a hole in the middle. I wondered first if I could manually fix this up (using new node links), but noticed that a RichAI wouldn’t follow it even though I’d added connections - which I guess makes sense - no triangles. I finally managed to get a Recast graph to cover the stairs by setting a cell size of 0.02 (and clearly now it takes a long time!)

I’m wondering:

  • Is there a better way for me to get the recast graph to cover the area I’m looking at (e.g. having a higher resolution just for this tiny area of the level)
  • Can I add connections myself and get the path follower to follow them
#2

Hi

Try to rasterize colliders instead of meshes (setting on the recast graph).
If the stair mesh is very complex, there might be some parts of it that technically have a too steep slope for the agent to traverse, even though it is a tiny region. A simplified collider (maybe even just a slope, no steps at all) can make it much easier to generate a good navmesh.

1 Like
#3

Great advice, thanks. It works fine with a little fiddling I now have a much better mesh.