visreg3d() for 3D isosurface with library plot3d and plot3drgl ?

[HaoLi111]

As title, E.g. isosurface plot: the values on each surface of the same color is the same.

usually we use a transparency option to avoid hidden surfaces.

plot3d gives relatively low speed 3d rendering in grdevice, whereas plot3drgl launches an gl device

the default number of levels may be set to 3-5 corresponding to certain statistical proportion of statistics of the predicted volumetric data. default transparency may be set to .4-.6

e.g.

autoVisi:: vmap((function(x,y,z) x^2+y^2+z^2),'u3d')