Change color or surface and points above an upper limit using scatter3 and trisurf.

Hi all! I am having trouble with colormapping. I would like to make all points and surface below a user set upper limit to have the colormap jet, but points and surface above this limit be red. Here is my code so far.

X = [My data]
Y = [My data]
Z = [My data]

xlin = linspace(min(X), max(X), 100);
ylin = linspace(min(Y), max(Y), 33);
[x,y] = meshgrid(xlin,ylin);


a = [min(X), min(X), max(X), max(X)];
b = [min(Y), max(Y), max(Y), min(Y)];
c = [1.176, 1.176, 1.176, 1.176];

for k = 1 : length(Z)
  if Z(k) > 1.176
    colorMap(k, :) = [1,0,0]; % Red
  else
    colorMap(k, :) = colormap(jet);
  end
end

z = griddata(X, Y, Z, x, y, 'cubic');

T = delaunay(x,y);

figure('Name','Minimum Voltage', 'NumberTitle','off')
trisurf(T,x,y,z)
h = trisurf(T,x,y,z);
set(h, 'edgealpha', 0.5);
axis tight; hold on
scatter3(X, Y, Z, colorMap, 'o', 'filled')
set(gca, 'xscale', 'log')
r = patch(a, b, c, 'r');
set(r, 'facealpha', 0.3)

I am getting errors:

Unable to perform assignment because the size of the left side is

1-by-3 and the size of the right side is 256-by-3.

Error in drawplot (line 18)

colorMap(k, :) = colormap(jet);

This is how far I have gotten.

Again. Surface pure red above upper plane, points pure red above upper plane. Thanks all, I am new to Matlab.