Surf to image conversion

Hi all, I have the following code:

h = getHeight;
x = getX;
y = getY;
z = getZ;
D=500;
height = z + h;
surf(x,y,height);

This generates a sphere (diameter 500) with a 3-dimensional etching with z-component "h" (h = getHeight; calls the global h variable.) This z-component "h" is very very small compared to the rest of the sphere. I want to make it such that when I use the image() function that I am given a 2-dimensional image of this etching that plots h(x,y) where every point on my 2-dimensional image shows an h value. I have attached a picture of what the surf looks like. You can see that the etching is very very small but actually does have thickness. Any suggestions?

[madhan ravi]

saveas() ?

Answer 1

[Image Analyst]

No, that code you posted doesn't make that, and in fact doesn't even run - you must have left something out.

Anyway, use the 'EdgeColor', 'none' option. For example:

[X,Y] = meshgrid(-5:.5:5);
Z = Y.*sin(X) - X.*cos(Y);
s = surf(X,Y,Z,'FaceAlpha',0.85, 'EdgeColor', 'none')

Answer 2

[Walter Roberson]

N = 500;
xmin = min(x); xmax = max(x);
ymin = min(y); ymax = max(y);
xidx = 1 + floor((x - xmin) ./ (xmax - xmin) * (N-1));
yidx = 1 + floor((y - ymin) ./ (ymax - ymin) * (N-1));
gridded_height = accumarray( [yidx(:), xidx(:)], height(:), [N N], @max, nan);

image(gridded_height, 'Xdata', [xmin, xmax], 'Ydata', [ymin ymax])

[Harrison Chong]

Hi, I get this error when I run your code:

Error using accumarray

First input SUBS must contain positive integer subscripts.

Error in run2 (line 27)

gridded_height = accumarray( [yidx(:), xidx(:)], height(:), [N N], @max, nan);

[Image Analyst]

What are you using for x and y? Attach your script.

[Walter Roberson]

Is it possible that x or y are constant? The code expects min(x) to be different than max(x) and min(y) to be different than max(y)

[Harrison Chong]

x and y are not constant.