c++ - FBXSDK，使用四元数设置旋转键？

Question

我正在尝试使用 Autodesk FBXSDK 编写文件保存应用程序。我使用欧拉旋转可以很好地工作，但我需要更新它以使用四元数。

相关函数是:

bool CreateScene(FbxScene* pScene, double lFocalLength, int startFrame)
{
    //Create Camera
    FbxNode* lMyCameraNode = FbxNode::Create(pScene, "p_camera");
    //connect camera node to root node
    FbxNode* lRootNode = pScene->GetRootNode();
    lRootNode->ConnectSrcObject(lMyCameraNode);
    FbxCamera* lMyCamera = FbxCamera::Create(pScene, "Root_camera");
    lMyCameraNode->SetNodeAttribute(lMyCamera);


    // Create an animation stack
    FbxAnimStack* myAnimStack = FbxAnimStack::Create(pScene, "My stack");

    // Create the base layer (this is mandatory)
    FbxAnimLayer* pAnimLayer = FbxAnimLayer::Create(pScene, "Layer0");

    myAnimStack->AddMember(pAnimLayer);

    // Get the camera’s curve node for local translation.

    FbxAnimCurveNode* myAnimCurveNodeRot = lMyCameraNode->LclRotation.GetCurveNode(pAnimLayer, true);

    //create curve nodes
    FbxAnimCurve* myRotXCurve = NULL;   
    FbxAnimCurve* myRotYCurve = NULL;
    FbxAnimCurve* myRotZCurve = NULL;

    FbxTime lTime;                         // For the start and stop keys.  int lKeyIndex = 0;                // Index for the keys that define the curve



    // Get the animation curve for local rotation of the camera.
    myRotXCurve = lMyCameraNode->LclRotation.GetCurve(pAnimLayer, FBXSDK_CURVENODE_COMPONENT_X, true);
    myRotYCurve = lMyCameraNode->LclRotation.GetCurve(pAnimLayer, FBXSDK_CURVENODE_COMPONENT_Y, true);
    myRotZCurve = lMyCameraNode->LclRotation.GetCurve(pAnimLayer, FBXSDK_CURVENODE_COMPONENT_Z, true);


    //This to add keys, per frame.  
    float frameNumber = startFrame;

    for (int i = 0; i < rec.size(); i++)
    {
        lTime.SetFrame(frameNumber);  //frame number

        //rx
        lKeyIndex = myRotXCurve->KeyAdd(lTime);
        myRotXCurve->KeySet(lKeyIndex, lTime, recRotX[i], FbxAnimCurveDef::eInterpolationLinear);

        //ry
        lKeyIndex = myRotYCurve->KeyAdd(lTime);
        myRotYCurve->KeySet(lKeyIndex, lTime, recRotY[i], FbxAnimCurveDef::eInterpolationLinear);

        //rz
        lKeyIndex = myRotZCurve->KeyAdd(lTime);
        myRotZCurve->KeySet(lKeyIndex, lTime, recRotZ[i], FbxAnimCurveDef::eInterpolationLinear);

        frameNumber += 1;

    }

    return true;
}

理想情况下，我想在这里传递四元数数据，而不是欧拉 x、y、z 值。 fbxsdk 可以吗？或者我需要先转换我的四元数数据，然后继续传入欧拉？谢谢。

Answer 1

您总是需要回到欧拉角，因为您只能获得 XYZ 旋转的动画曲线。您唯一可以控制的是轮换顺序。

但是，您可以使用 FbxQuaternion 进行计算，然后使用 .DecomposeSphericalXYZ() 获得 XYZ 欧拉角。