Yes, you want to set the FaceVertexCData property of the patch object to your data, and the FaceColor property to 'flat'.
Here's a simple example:
%%Create an isosurface
[x y z v] = flow;
p = patch(isosurface(x, y, z, v, -3));
daspect([1 1 1])
view(3)
%%Compute the area of each face
u = p.Vertices(p.Faces(:,2),:) - p.Vertices(p.Faces(:,1),:);
v = p.Vertices(p.Faces(:,3),:) - p.Vertices(p.Faces(:,1),:);
n = cross(u,v);
a = sqrt(n(:,1).^2 + n(:,2).^2 + n(:,3).^2) / 2;
%%Color the faces with the area
p.FaceVertexCData = a;
p.FaceColor = 'flat';
p.EdgeColor = 'none';
Instead of the area, you would use your calculated data. The FaceVertexCData property should be a vector whose length is the same as the number of faces in your patch.
