omni::connect::core::getLocalTransform does not return scale nor rotation, why?

Omniverse Core Platform Core APIs
1

Hello,

I’m trying to get transformation from a UsdPrim using omni::connect::core::getLocalTransform() function. It seems it does not compute rotation and scale and only takes translation into account from what I can tell. Am I doing something wrong?

I’m testing with a simple cube I create with USDComposer and I apply a scale, or a rotation, but when reading the USD I don’t find the same matrix.

If I use the USD library functionalities I find the appropriate 4x4 matrix it seems:

GfMatrix4d GetGfTransform(const UsdPrim& prim) {
    if (!prim) {
        throw std::invalid_argument("Invalid UsdPrim provided");
    }

    UsdGeomXformable xformable(prim);
    if (!xformable) {
        throw std::invalid_argument("The provided prim is not transformable");
    }

    // Get the local transformation matrix
    bool resetXformStack;
    GfMatrix4d transformMatrix;
    xformable.GetLocalTransformation(&transformMatrix, &resetXformStack);

    return transformMatrix;
}

...

// xform gets wrong data
pxr::GfTransform xform = omni::connect::core::getLocalTransform(prim);
// usdXform seems better
auto usdXform = GetGfTransform(prim);