When using `scatter3()` to plot scattered 3-D plots, empty figures are being generated instead. For example, ``` figure [X,Y,Z] = sphere(16); x = [0.5*X(:); 0.75*X(:); X(:)]; y = [0.5*Y(:); 0.75*Y(:); Y(:)]; z = [0.5*Z(:); 0.75*Z(:); Z(:)]; scatter3(x,y,z) fig2plotly(); ``` Expected and generated (https://chart-studio.plotly.com/~xarico10/439/#/) plots: <img width="508" alt="Captura de Pantalla 2021-07-26 a la(s) 12 58 40 p m" src="https://user-images.githubusercontent.com/87881895/127036233-e910b1fd-f9ef-4f8f-ad95-5c9c0ed00f32.png"> <img width="683" alt="Captura de Pantalla 2021-07-26 a la(s) 12 58 53 p m" src="https://user-images.githubusercontent.com/87881895/127036272-b346f456-4d1c-41b0-b15f-cb51ceea969a.png"> Examples on using `scatter3()` can be found on: https://www.mathworks.com/help/matlab/ref/scatter3.html#responsive_offcanvas