[Question] Why add 6 for Sdf size in get3DGaussNewton Implementation ?

[JChan2787]

Per your implementation of your get3DGaussNewton function, one of the first things you create is std::vector Sdf. I am a little stumped as to why you are adding 6 more Mat objects on top of the size coming from blendshapes, as referenced from the line below:

std::vector<Mat<float>> Sdf(modes3.size() + 6, Mat<float>(curShape.height, curShape.width));

My initial guess is it could be tied to the number of blendshape objects you are using when I referenced the Mesh folder under Assets. Could this imply that we will need to increment this value should we choose to add more blendshapes? Could you please clarify?

Thank you.

[MarekKowalski]

Hi,
Thanks for the question. As you can see in lines 232-240 in the same file, the additional 6 places are for the gradients of rotation and translation of the 3D shape.

Thanks,

Marek