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gmaze | 
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% PII = boxcar(C3D,H,X,Y,Z,isoC,dC) | 
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% The boxcar function: | 
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%                               {  isoC-dC/2 <= C3D(iZ,iY,iX) < isoC + dC/2 | 
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% PII(isoC,C3D(iZ,iY,iX) = 1 if:{  Z(iZ) > H(iY,iX) | 
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%                        = 0 otherwise | 
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% | 
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% Rq: | 
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% H may be a single value | 
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% Z and H should be negative | 
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% Z orientatd downward | 
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% | 
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%function [PII] = boxcar(C3D,H,X,Y,Z,isoC,dC) | 
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function [PII A B C] = boxcar(C3D,H,X,Y,Z,isoC,dC) | 
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nz  = length(Z); | 
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ny  = length(Y); | 
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nx  = length(X); | 
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method = 2; | 
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if length(H) == 1, H = H.*ones(ny,nx); end | 
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switch method | 
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  case 1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | 
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     PII = zeros(nz,ny,nx);  | 
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     warning off | 
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     for ix = 1 : nx | 
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       for iy = 1 : ny | 
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         Cprof = squeeze(C3D(:,iy,ix)); | 
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         li = find( isoC-dC/2 <= Cprof   & ... | 
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                        Cprof < isoC+dC/2 & ... | 
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                            Z > H(iy,ix) ); | 
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         if ~isempty(li) | 
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           PII(li,iy,ix) = 1; | 
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         end %if | 
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       end %for iy | 
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     end %for ix | 
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     warning on | 
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  case 2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | 
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     PII = ones(nz,ny,nx);  | 
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     [a b]=meshgrid(Z,H); b=reshape(b,[ny nx nz]);b=permute(b,[3 1 2]);H=b;clear a b | 
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     [a b c]=meshgrid(Z,Y,X);a=permute(a,[2 1 3]);Z=a;clear a b c | 
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     PII(find( -dC/2 < C3D-isoC & C3D-isoC <= +dC/2 & H<=Z  ))  = 0; | 
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     PII = 1-PII; | 
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end %switch method | 
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | 
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%%% Also provide the 1/0 matrix of the layer boundaries: | 
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bounds_vert = zeros(nz,ny,nx); | 
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bounds_meri = zeros(nz,ny,nx); | 
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for ix = 1 : nx | 
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piisect   = squeeze(PII(:,:,ix)); | 
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boundsect = zeros(nz,ny); | 
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% Determine vertical boundaries of the layer: | 
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for iy = 1 : ny | 
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  li = find(piisect(:,iy)==1); | 
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  if length(li) ~= 0 | 
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    boundsect(li(1),iy)  = 1; | 
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    boundsect(li(end),iy) = 1; | 
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  end | 
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end | 
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bounds_vert(:,:,ix) = boundsect; | 
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boundsect = zeros(nz,ny); | 
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% Determine horizontal meridional boundaries of the layer: | 
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for iz = 1 : nz | 
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  li = find(piisect(iz,:)==1); | 
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  if length(li) ~= 0 | 
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    boundsect(iz,li(1))   = 1; | 
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    boundsect(iz,li(end)) = 1; | 
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  end | 
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end | 
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bounds_meri(:,:,ix) = boundsect; | 
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end %for ix | 
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bounds_zona = zeros(nz,ny,nx); | 
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for iy = 1 : ny | 
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piisect   = squeeze(PII(:,iy,:)); | 
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boundsect = zeros(nz,nx); | 
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% Determine horizontal zonal boundaries of the layer: | 
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for iz = 1 : nz | 
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  li = find(piisect(iz,:)==1); | 
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  if length(li) ~= 0 | 
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    boundsect(iz,li(1))   = 1; | 
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    boundsect(iz,li(end)) = 1; | 
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  end | 
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end | 
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bounds_zona(:,iy,:) = boundsect; | 
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end %for iy | 
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A = bounds_vert; | 
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B = bounds_meri; | 
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C = bounds_zona; | 
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