Creating a transparent closed 3D surface plot from (x,y,z) scatter data points

I have a set of (x,y,z) data points (file attached). I can use scatter3 to plot 3d scatter plot.

d1=load('Scatter_data_x_y_z.txt');

scatter3(d1(:,1),d1(:,2),d1(:,3),'.y')

It is a closed surface and it is prolate spheroid. I want to draw a transparent closed surface instead of 3D scatter plot. How do I do that? Typical scatter3 plot of two such prolated spheriod is given below.

Actually, the surface in blue is a spindle toroid.

Answer 1

[KSSV]

d1=load('Scatter_data_x_y_z.txt');
shp = alphaShape(d1) ;
plot(shp)

[Satyajit Ghosh]

Thanks for your your answer. But, how do I make it transparent?