
Analytical intersection volume between two spheres 1.0 File ID: 81403 


 Analytical intersection volume between two spheres 1.0 License: Shareware File Size: 10.0 KB Downloads: 3
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Analytical intersection volume between two spheres 1.0 Description 

Description: Compute the overlap volume between 2 spheres defined in an array. Computation is vectorized, and intersection volume are computed an analytical way.
Input: spheres data presented in an array G of four columns. G contains parameters of the n spheres . G(1:n,1)  xcoordinate of the center of spheres, . G(1:n,2)  ycoordinate of the center of spheres, . G(1:n,3)  zcoordinate of the center of spheres, . G(1:n,4)  radii of the spheres Each row of the array contains the information for one sphere.
Input can also be provided in three different vectors. These vectors can be row or column vectors. The 1st one corresponds to xcoordinate of the center of spheres, the 2nd one to the ycoordinate, the 3rd one to the zcoordinate and the 4th one to the radii of the spheres. An optional binary argument can be provided to display or not the result.
Output: Square matrix M(n,n) containing intersection volumes between spheres M(i,j) contains the intersection volume between spheres i & j By definition, M(i,i) corresponds to the volume of sphere i.
Examples:
x = [0,1,5,3,5]; y = [0,4,3,7,0]; z = [0,4,3,7,0]; r = [1,5,3,2,2]; Display_solution = true; disp('First call') M = volume_intersect_sphere_analytical(x,y,z,r,Display_solution); disp('Second call') M = volume_intersect_sphere_analytical([x',y',z',r'],false);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% For 2 spheres i & j, three cases are possible depending on the distance d(i,j) of the centers of the spheres i and j. Case 1: spheres i & j do not overlap, there is no overlap volume M(i,j)=0; Condition: d(i,j)>= ri+rj M(i,j) = 0; Case 2: spheres i & j fully overlap, the overlap volume has to be computed. Condition: d(i,j)<= abs(rirj) M(i,j) = 4/3*pi*min(ri,rj).^3 Case 3: spheres i & j partially overlap, the overlap volume has to be computed decomposing the overlap volume. 
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