polyop.attach obj1 obj2 in SDK

Anonymous — Fri, 20 Mar 2015 17:10:39 GMT

How would you attach 2 or more objects in the sdk and how would you detach keeping their maps and UVWs

Re: polyop.attach obj1 obj2 in SDK

Anonymous — Fri, 20 Mar 2015 19:00:06 GMT

Here's an untested example for both poly attach and poly detach. Make sure to have a look at the documentation of classes PolyObject and MNMesh. I don't actually know if this keeps maps and UVWs intact. But it should give you a decent starting point.

The polyAttach function takes a node that must reference an poly object and an INodeTab containing nodes that should be attached to the node. All attached nodes are then deleted.

bool polyAttach(INode* targetNode, const INodeTab& sourceNodes)
{
    if (!targetNode || sourceNodes.Count() == 0)
        return false;

    // make sure we have a valid poly object

    auto targetObj = targetNode->GetObjectRef();
    if (!targetObj || targetObj->SuperClassID() != GEOMOBJECT_CLASS_ID || targetObj->ClassID() != Class_ID(POLYOBJ_CLASS_ID, 0))
        return false;

    // cast the object to a poly object

    auto targetPolyObj = static_cast<PolyObject*>(targetObj);

    // get the poly mesh we want the other poly meshes to attach to

    auto targetPolyMesh = &targetPolyObj->GetMesh();

    // iterate all source nodes

    for (auto i = 0; i < sourceNodes.Count(); ++i)
    {
        auto sourceNode = sourceNodes[i];
        if (!sourceNode)
            continue;

        // get and check if the object can be converted to a poly object

        auto sourceObj = sourceNode->EvalWorldState(0).obj;
        if (!sourceObj || sourceObj->SuperClassID() != GEOMOBJECT_CLASS_ID || !sourceObj->CanConvertToType(Class_ID(POLYOBJ_CLASS_ID, 0)))
            continue;

        // convert the object to a poly object

        auto sourcePolyObj = static_cast<PolyObject*>(sourceObj->ConvertToType(GetCOREInterface()->GetTime(), Class_ID(POLYOBJ_CLASS_ID, 0)));
        if (!sourcePolyObj)
            continue;

        // get the mesh and attach it to the target mesh

        auto sourcePolyMesh = &sourcePolyObj->GetMesh();
        *targetPolyMesh += *sourcePolyMesh;

        // delete the temporary source poly object (only if ConvertToType() created a new object)

        if (sourcePolyObj != sourceObj)
            sourcePolyObj->DeleteThis();

        // finally delete the node we took the mesh from as we usually don't need it anymore

        sourceNode->DeleteMe();
    }

    return true;
}

The polyDetach function takes a node which must reference a poly object. It then detaches the currently selected element to a new node.

bool polyDetach(INode* node)
{
    if (!node)
        return false;

    // make sure we have a valid (poly) object

    auto obj = node->GetObjectRef();
    if (!obj || obj->SuperClassID() != GEOMOBJECT_CLASS_ID || obj->ClassID() != Class_ID(POLYOBJ_CLASS_ID, 0))
        return false;

    // cast the object to a poly object

    auto polyObj = static_cast<PolyObject*>(obj);

    // create a new poly object that will hold the detached mesh

    auto detachedPolyObj = static_cast<PolyObject*>(CreateInstance(GEOMOBJECT_CLASS_ID, Class_ID(POLYOBJ_CLASS_ID, 0)));
    if (!detachedPolyObj)
        return false;

    // detach the SELECTED element to the new poly object's mesh (see class MNMesh)

    if (!polyObj->GetMesh().DetachElementToObject(detachedPolyObj->GetMesh()))
    {
        detachedPolyObj->DeleteThis();
        return false;
    }

    // create a new node referencing the detached poly object

    auto newNode = GetCOREInterface()->CreateObjectNode(detachedPolyObj);
    if (!newNode)
    {
        detachedPolyObj->DeleteThis();
        return false;
    }

    return true;
}

Re: polyop.attach obj1 obj2 in SDK

Anonymous — Sat, 21 Mar 2015 11:22:04 GMT

Thanks, that's great.

Just what I was after.

topic Re: polyop.attach obj1 obj2 in SDK in 3ds Max Programming Forum

polyop.attach obj1 obj2 in SDK

Re: polyop.attach obj1 obj2 in SDK

Re: polyop.attach obj1 obj2 in SDK