When using `streamslice()` to draw well-spaced streamlines (with direction arrows), lines and arrows are being plotted as a 3-D scatter chart. ``` load wind streamslice(x,y,z,u,v,w,[],[],5) fig2plotly(gcf, 'offline', false); ``` Expected and generated (https://chart-studio.plotly.com/~xarico10/1005/#/) plots: <img width="502" alt="Captura de Pantalla 2021-08-05 a la(s) 3 38 49 p m" src="https://user-images.githubusercontent.com/87881895/128417938-c2678cc5-148c-4681-ae3a-d723fbf5d265.png"> <img width="732" alt="Captura de Pantalla 2021-08-05 a la(s) 3 39 00 p m" src="https://user-images.githubusercontent.com/87881895/128417966-7331d06e-1bac-44bc-b22f-f3924fcbe4d9.png"> Examples on using `streamslice()` can be found on: https://www.mathworks.com/help/matlab/ref/streamslice.html