Is it possible to generate pores in surface?

Question

Hi want to generate 3d pores in the surface of sphere something like that.

Please suggest me how it can be done in Mathematica.

Answer 1

There are some nice tools using Derived Geometric Regions that you can use for this

For example:

router = 2; (*outside radius*)
rinner = 1; (*inside radius*)
rsmall = 0.1; (*radius of small pores*)
nsmall = 40; (*number of small pores*)
radii = RandomReal[{rinner + 2*rsmall, router - 2 rsmall},nsmall];(*radial position of smallpores*)

angle1 = RandomReal[{0, 2 $\Pi$},nsmall];(*angular position of small pores*)
coords = Map[radii[[#]]*{0, Sin[angle1[[#]]], Cos[angle1[[#]]]} &,Range[nsmall]];(*coordinates of small pores*)
hollowsphere = RegionDifference[Ball[{0, 0, 0}, 2], Ball[{0, 0, 0}, 1]];(*first region interesection*)
smallspheres =  RegionUnion[Map[Ball[coords[[#]], rsmall] &, Range[nsmall]]];(*combine small pores*)

hollowsphereminussmallspheres = RegionDifference[hollowsphere, smallspheres] (*second region interesection*)
r1 = ImplicitRegion[x < 0, {x, y, z}]; (*For visualization*)
rplot = RegionIntersection[r1, hollowsphereminussmallspheres];

Then use this to plot:

RegionPlot3D[rplot, PlotPoints -> 100]

giving:

Not exactly as the image but if you play with the arrangement of the pores you should get what you want.