How to interpolate a series of 3D coordinates into 3D array of specific size

Hi,

I have a 3D array (sz: 400x400x160) with binary mask of a bone inside it. Additionally I have a transformation matrix obtained using affine3d fnc. I want to rotate the binary mask without rotating the array itself.

At first I tried to use imwarp to apply the rotation:

A = data.subMask{3,9};
TM = data.regOutput.LeftFem.Transform{8};
Arot = imwarp(A,TM);
whos A TM Arot;
  Name  Size        Bytes    Class     Attributes
  A     400x400x160 25600000 logical 
  Arot  405x402x170 27677700 logical 
  TM    1x1         136      affine3d

Arot has changed it's size, which is not what I require. I need the array to remain the same dimensions (in order to be able to to show it's rotated patch aside other bone masks of size 400x400x160). Therefore I figured that If I get the 3D coordinates of the locations of the points in a pointCloud of the same boneMask, then rotate those 3D coordinates

coords = data.bonePtCld{3,9}.Location;
coordsRot = transformPointsForward(TM, coords);
whos coords coordsRot;
  Name      Size    Bytes    Class    Attributes
  coords    65966x3 1583184  double 
  coordsRot 65966x3 1583184  double

Now getting to the problem I encountered. I don't know how to interpolate these 3D points into an array of the required size (400x400x160). If I understood correctly from the documentation, it has to be done using a combination of meshgrid and interp3 functions, but I have yet not succeeded. This is what I tried:

[X Y Z] = meshgrid(0:399,0:399, 0:159);
XI = [X(:), Y(:), Z(:)];
for cc = length(coordsRot)
V = interp3(X, Y, Z, XI, coordsRot(cc,1), coordsRot(cc,2), coordsRot(cc,3));
end

Error using griddedInterpolant
The number of input coordinate arrays does
not equal the number of dimensions (NDIMS)
of these arrays.

Error in interp3 (line 143)
F = griddedInterpolant(X, Y, Z, V, method,extrap);

I also tried:

V = interp3(X, Y, Z, XI, coordsRot(:,1), coordsRot(:,2), coordsRot(:,3));

but got the same error.

Any help would be greatly appreciated!

Thanks!

Andre