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Message from discussion Odd Tile Portal Behavior after Recast Upgrade
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Stephen Pratt  
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 More options Mar 26 2012, 6:39 pm
From: Stephen Pratt <steve...@gmail.com>
Date: Mon, 26 Mar 2012 16:39:58 -0600
Local: Mon, Mar 26 2012 6:39 pm
Subject: Re: Odd Tile Portal Behavior after Recast Upgrade
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Just an update:

I've confirmed that the problem appears when I switch from R331 to R332.
So it looks like you are right about the R332 change set causing the
problem.

It may take a little while to locate the cause since I don't have the
ability to visualize contour data yet.

-Steve

On Fri, Mar 23, 2012 at 11:29 PM, Mikko Mononen <memono...@gmail.com> wrote:
> Hi,

> Looks like a bug caused by R332
> http://code.google.com/p/recastnavigation/source/detail?r=332
> I moved the portal calculations a bit higher up.

> I think it might come from border vertex removal, it probably does not
> preserve the portal flags.

> --mikko

> On Sat, Mar 24, 2012 at 12:38 AM, Stephen Pratt <steve...@gmail.com>
> wrote:
> > Hi All,

> > I've been using Recast to successfully build tiled meshes for several
> > months.  Recently I upgraded my version of Recast and now have problems
> > where portals between tiles are being erroneously marked as
> > solid...sometimes.  While I don't yet know the exact trigger, I do know
> that
> > it has to do with the Recast build process (not Detour) and that the
> problem
> > goes away completely if I fall back to the earlier Recast version.

> > The version upgrade was from r312 (September 2011) to r335 (March 2012).

> > Here is an example of the problem using a plane with a box.

> > Plane size: 100x100 world units.
> > Cell Size: 0.1

> > Tile Size: 128
> > Border Size: 7  (Various border sizes tried.)
> > Walkable Radius: 4

> > In the images, the bounding boxes represent tile size + border size.

> > In this first image I've built a section of the plane without the box.
> As
> > you can see, everything is fine.

> > Simple Plane - No Problem

> > In this next image, I've moved the box into one of the tiles.  Suddenly
> one
> > of the portals changes to a solid boundary. (Red)

> > Simple Plane - Tile Portal Error

> > I can see in my debug visualizations that this happening in the PolyMesh
> > object.  Anywhere from zero to four of the portals will become solid as I
> > move the box around.  Adjusting the boundary size effects which portals
> > become solid, but the problem never goes away.

> > The problem goes away when I export the geometry and build it in the
> Recast
> > Demo.  So the trigger is somewhere in my build process. But no luck
> tracking
> > it down so far.

> > Any ideas where I can look for the source of this type of problem?

> > -Steve


 
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