MATLAB enlarge 3D plot without enlarging colorbar - matlab

Question

Is it possible to enlarge a 3D patch without altering the size of the colorbar? My original picture is like this one:
I just want to enlarge the block in the middle of the figure keeping the colorbar unchanged. I used zoom(1.9) before, it is good but since I need to use a for loop to read sequential files to plot different graphs and make video, the graph became larger and larger so it seems that I need another method to enlarge the plot.
Update: my codes
set(gcf,'Renderer','zbuffer'); %eliminate unnecessary background and prevent stationary video - Important!
vid = VideoWriter('afation.avi'); %Create a avi file
vid.Quality = 100;
vid.FrameRate = 15;
open(vid); %Open the avi file so that films can be put into it later on
for ii=FirstFile:FileInterval:LastFile
fid = fopen(filename,'r');
datacell = textscan(fid, '%f%f%f%f%f%f%f%f'); %There are 8 columns to be read so there are 8 %f
fclose(fid);
all_data = cell2mat(datacell); %converted into a matrix containing all the dis. density info. for every simulation cell
M=zeros(NumBoxX,NumBoxY,NumBoxZ); %create a matrix of 50x50x5,representing array of simulation cells
% % the following loops assign the dislocation density from all_data to M
for i=1:NumBoxX
for j=1:NumBoxY
for k=1:NumBoxZ
num=k+NumBoxZ*(j-1)+NumBoxZ*NumBoxY*(i-1);
M(i,j,k)=all_data(num,ValCol); %the ValCol column of all_data is dislocation density
end
end
end
indPatch=1:numel(M);
[F,V,C]=ind2patch(indPatch,M,'v'); %Call the function ind2patch in order to plot 3D cube with color
title('AA in different cells','fontsize',20);%set title \sigma_{xx}
xlabel('y','fontsize',20);ylabel('x','fontsize',20); zlabel('z','fontsize',20); hold on;
set(get(gca,'xlabel'),'Position',[5 -50 30]); %set position of axis label
set(get(gca,'ylabel'),'Position',[5 50 -15]);
set(get(gca,'zlabel'),'Position',[64 190 -60]);
patch('Faces',F,'Vertices',V,'FaceColor','flat','CData',C,'EdgeColor','k','FaceAlpha',0.5);
axis equal; view(3); axis tight; axis vis3d; grid off;
colormap(cMap);
caxis([MinDis MaxDis]); %set the range of the colorbar %caxis([min(M(:)) max(M(:))]); %range of the colorbar according to one file only
cb = colorbar; % create the colorbar
set(get(cb,'title'),'string','aaty(m^{-2})','fontsize',20);
lbpos = get(cb,'title'); % get the handle of the colorbar title
set(lbpos,'units','normalized','position',[0,1.04]);
MyAxes=gca;
set(MyAxes,'Units','Normalized','position',[0.05,0.1,0.8,0.8]);
zoom(1.9);
writeVideo(vid, getframe(gcf)); %get the picture and put in the avi file with the handle "vid"
end
close(vid); %close the avi file after putting all the films into it
% winopen('ggggon.avi'); %play the movie
I put the zoom in the for loop because I need to enlarge the picture one by one and put them into my avi file to make movie.