GetDevMesh() and oapiMeshGroup() do not work together - Orbiter-Forum

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GetDevMesh() and oapiMeshGroup() do not work together

GetDevMesh() and oapiMeshGroup() do not work together	Issue Tools

07-19-2012 03:41 PM

dumbo2007

Crazy about real time sims

GetDevMesh() and oapiMeshGroup() do not work together

GetDevMesh() and oapiMeshGroup() do not work together

As discussed in this thread : http://orbiter-forum.com/showthread.php?p=372076

I was looking for a way to get mesh group vertex data that works uniformly across all clients.

I tried this :

Code:

    VISHANDLE hvisCar = *oapiObjectVisualPtr (oapiGetObjectByName("GL-01"));

    if (hvisCar != NULL) {

        DEVMESHHANDLE hDevMsh = vCollider->GetDevMesh(hvisCar, 0);
        MESHGROUP* mshGrp =  oapiMeshGroup(hDevMsh, mGroupIndex);
        }

So hDevMsh is valid , but mshGrp is returned as NULL.

This works :

Code:

VISHANDLE hvisCar = *oapiObjectVisualPtr (oapiGetObjectByName("GL-01"));

    if (hvisCar != NULL) {

        //DEVMESHHANDLE hDevMsh = vCollider->GetDevMesh(hvisCar, 0);
        MESHHANDLE hDevMsh = vCollider->GetMesh(hvisCar, 0);
        MESHGROUP* mshGrp =  oapiMeshGroup(hDevMsh, mGroupIndex);

    }

GetDevMesh() output should work with oapiMeshGroup(() and this is supposed to be the device independent way...isnt it ?

Issue Details
Issue Type Bug Project ORBITER: 2010-P1 Status Unconfirmed Priority 5 - Medium Affected Version 111105 Fixed Version (none) Users able to reproduce bug 0 Users unable to reproduce bug 0 Attachments 0 Assigned Users (none) Tags (none)

07-19-2012 04:45 PM

orb

O-F Administrator
Ninja

I'm not sure a device dependent mesh will return a valid mesh group. It should be rather a device independent mesh (template) which will return valid mesh groups.

07-19-2012 05:40 PM

orb

O-F Administrator
Ninja

Here's a quote from Orbiter Beta forum:

Quote:

Originally Posted by martins

Functions that operate on a DEVMESHHANDLE are not entirely analogous to those acting on MESHHANDLES. For example, oapiMeshGroup is not implemented for DEVMESHHANDLEs, because orbiter doesn't know where and in what format mesh groups are stored (or even if the meshes are organised in groups by the client). Therefore, oapiMeshGroup is deprecated. It still works with the inline client, but not with external clients.

For reference, it was also quoted in this issue report.

07-27-2012 03:21 AM

dumbo2007

Crazy about real time sims

ok, so how then do I get the vertices for a mesh group in my plugin and expect it to run across all clients ?

Here is what I do currently :

Code:

double xMin = DBL_MAX, xMax = -DBL_MAX, yMin = DBL_MAX, yMax = -DBL_MAX, zMin = DBL_MAX, zMax = -DBL_MAX;


    // Print out the vertices

    VISHANDLE hvisCar = *oapiObjectVisualPtr (oapiGetObjectByName("GL-01"));

    if (hvisCar != NULL) {

        //DEVMESHHANDLE hDevMsh = vCollider->GetDevMesh(hvisCar, 0); //TODO This should be made to work, GetMesh() crashes with clients
        MESHHANDLE hDevMsh = vCollider->GetMesh(hvisCar, 0);

        for (int i = 0; i < NUM_WHEELS; i++) {
            MESHGROUP* mshGrp =  oapiMeshGroup(hDevMsh, mWheelMeshGroupIndex[i]);

            for (unsigned int j = 0; j < mshGrp->nVtx; j++ ) {
                /*oapiWriteLogV("Vertex : %3d : (%f, %f, %f)", j,
                        mshGrp->Vtx[j].x, mshGrp->Vtx[j].y, mshGrp->Vtx[j].z );*/

                if (mshGrp->Vtx[j].x < xMin)
                    xMin = mshGrp->Vtx[j].x;
                if (mshGrp->Vtx[j].x > xMax)
                    xMax = mshGrp->Vtx[j].x;

                if (mshGrp->Vtx[j].y < yMin)
                    yMin = mshGrp->Vtx[j].y;
                if (mshGrp->Vtx[j].y > yMax)
                    yMax = mshGrp->Vtx[j].y;

                if (mshGrp->Vtx[j].z < zMin)
                    zMin = mshGrp->Vtx[j].z;
                if (mshGrp->Vtx[j].z > zMax)
                    zMax = mshGrp->Vtx[j].z;

            }

            mWheelMeshGroupCenter[i] = _V((xMax + xMin)/2, (yMax + yMin)/2, (zMax + zMin)/2);

            oapiWriteLogV("Center of mesh group %d is at (%f, %f, %f) wrt vessel",
                    mWheelMeshGroupIndex[i], V3ARGS(mWheelMeshGroupCenter[i]));
        }

    }

07-29-2012 12:39 AM

martins martins is offline

Orbiter Founder

For modifying the group, you can use oapiEditMeshGroup, which calls the client's clbkEditMeshGroup method.

Note that this is less efficient than oapiMeshGroup, since the modified vertices need to be copied, but that can't be helped.

For obtaining the mesh group, can't you query the device-independent template instead?

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