How to use offmesh connections?

[royluo03]

Hi,

I've tested building NavMesh from a obj file which is exported from UE4.25. It works very well.

But I didn't pass the test for offmesh connections.

My test septs are:

1. add an off mesh connection to input geometry.
2. build nav mesh
3. find path

My test codes for adding off mesh as below:

func (ig *InputGeom) AddOffMeshConnection(spos [3]float32, epos [3]float32, rad float32, bidir uint8, area uint8, flags uint16) {

if ig.offMeshConCount >= 256 {
	return
}

ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2] = spos[0]
ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2 + 1] = spos[1]
ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2 + 2] = spos[2]

ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2 + 3] = epos[0]
ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2 + 4] = epos[1]
ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2 + 5] = epos[2]



//fmt.Printf("OffMeshConnectionVerts: %v\n",soloMesh.geom.OffMeshConnectionVerts())

ig.OffMeshConnectionRads()[ig.offMeshConCount] = rad
ig.OffMeshConnectionDirs()[ig.offMeshConCount] = bidir
ig.OffMeshConnectionAreas()[ig.offMeshConCount] = area
ig.OffMeshConnectionFlags()[ig.offMeshConCount] = flags
ig.OffMeshConnectionId()[ig.offMeshConCount] = uint32(1000 + ig.offMeshConCount)


//m_offMeshConRads[m_offMeshConCount] = rad;
//m_offMeshConDirs[m_offMeshConCount] = bidir;
//m_offMeshConAreas[m_offMeshConCount] = area;
//m_offMeshConFlags[m_offMeshConCount] = flags;
//m_offMeshConId[m_offMeshConCount] = 1000 + m_offMeshConCount;

ig.offMeshConCount ++

}

please correct me.

Thanks

[arl]

Hey Unfortunately I'm not sure all the code required for off mesh connections to work had been ported from original c++. This wasn't a feature I needed at that time so I haven't been focusing on that as much as building and using basic nav mesh features. As you can see, we're close but not there yet, the off mesh connections test is disabled at the moment https://github.com/arl/go-detour/blob/12dd802a0d65ef1a0157fc6753688533f3abaf36/detour/offmeshcons_test.go#L13 I hope to have enough time soon to get back to it.

…

On Mon, Jun 28, 2021, 12:04 royluo03 ***@***.***> wrote: Hi, I've tested building NavMesh from a obj file which is exported from UE4.25. It works very well. But I didn't pass the test for offmesh connections. My test septs are: 1. add an off mesh connection to input geometry. 2. build nav mesh 3. find path My test codes for adding off mesh as below: func (ig *InputGeom) AddOffMeshConnection(spos [3]float32, epos [3]float32, rad float32, bidir uint8, area uint8, flags uint16) { if ig.offMeshConCount >= 256 { return } ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2] = spos[0] ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2 + 1] = spos[1] ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2 + 2] = spos[2] ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2 + 3] = epos[0] ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2 + 4] = epos[1] ig.OffMeshConnectionVerts()[ig.offMeshConCount*3*2 + 5] = epos[2] //fmt.Printf("OffMeshConnectionVerts: %v\n",soloMesh.geom.OffMeshConnectionVerts()) ig.OffMeshConnectionRads()[ig.offMeshConCount] = rad ig.OffMeshConnectionDirs()[ig.offMeshConCount] = bidir ig.OffMeshConnectionAreas()[ig.offMeshConCount] = area ig.OffMeshConnectionFlags()[ig.offMeshConCount] = flags ig.OffMeshConnectionId()[ig.offMeshConCount] = uint32(1000 + ig.offMeshConCount) //m_offMeshConRads[m_offMeshConCount] = rad; //m_offMeshConDirs[m_offMeshConCount] = bidir; //m_offMeshConAreas[m_offMeshConCount] = area; //m_offMeshConFlags[m_offMeshConCount] = flags; //m_offMeshConId[m_offMeshConCount] = 1000 + m_offMeshConCount; ig.offMeshConCount ++ } please correct me. Thanks — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#35>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AADUL2WWL2X5LXHFMD7Z6YLTVBCJNANCNFSM47NUHHAA> .

[royluo03]

Hi
I'm gonna study original c++ code and try to port off mesh conn feature. Looking forward you can have time to get back on it :)

Thanks!

[arl]

Thanks @royluo03 that'd be awesome.
I think most of the functions might already have been ported. The porting is not really the hardest part, it's just tedious and long. The hardest is to test it.
Hint: use staticcheck and see what functions are marked as dead-code, that's probably because the functions that call them haven't been ported yet.
Let me know what you find

[royluo03]

code.zip
Hi,

My friend got something from original c++ code and did some adjustment in go code than we pass the off mesh test.

attached 3 adjusted codes please check it.

[arl]

Hi. Thanks for the code. It would be much simpler to review if you opened a pull request. Can you?

…

On Fri, Jul 2, 2021, 09:30 royluo03 ***@***.***> wrote: code.zip <https://github.com/arl/go-detour/files/6752840/code.zip> Hi, My friend got something from original c++ code and did some adjustment in go code than we pass the off mesh test. attached 3 adjusted codes please check it. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#35 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AADUL2RYOTA4567GTNKZU2LTVVTIZANCNFSM47NUHHAA> .

[royluo03]

Haven't use it before. I'm gonna try :)