closed 3d surface of scattered data

Hey folks,

hope you guys can help me.

I have a set of scattered 3d-points. Lets imagine these are temperature values inside a cube.

So I have X,Y,Z-coordinates of each point and a temperature-value for each of these positions.

Now I want to plot these points. No problem till here. But: Now you can enter a temperature, for example 300K and I want to show a closed surface surrounding all the points having a temperature value of about 300K or higher.

I tried using surf, convhull and all of the derivates using delaunay, meshgrid etc.

For me it seems as if there is no function in matlab to plot a closed surface?! I just want to plot my scattered points and enclose all the points of a specified temperature. It should look like a baloon or whatever. I am getting tired hunting on the internet for a solution.

So, anyone, any ideas? I would appreciate any suggestions!
So long!
.

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