How to plot 3D using a table (2024)

Thanks for your reply. Actually the table is lot bigger than that (1M x 5) matrix

"Do you want to plot spheres of different radii and colors, with centers at the specified x,y,z values"

yes actually that what i want, i don't care if it overlap, but if there any space on between, it schuld get automaticlly a interpolated color. At the end ill have some colord 3D modell but Ballons anymore

@Mad Gano, I will look at this tonight.

The last line of file ColorMix.txt has a sphere that is far away from all the other spheres. Inclusion of that sphere in the plot makes the others look tiny and squished into one corner. Therefore I deleted the last line of ColorMix.txt and saved the edited file as ColorMix2.txt. If you want to see the result with the outlier sphere, edit the file name in line 1 to 'ColorMix.txt'.

When you run the code in Matlab, you will be able to click and drag in the plot, to rotate the plot in 3D.

Good luck!

Thanks but I need the color interpretation between these speres

@Mad Gano, Please explain precisely what you mean by a "color interpretation between these spheres". The existing color bar interprets the colors for the viewer. Do you mean interpolation, not interpretation?

In an earlier comment, you wrote

"i don't care if it overlap, but if there any space on between, it schuld get automaticlly a interpolated color. At the end ill have some colord 3D modell but Ballons anymore"

I cannot parse that statement. Please explain more clearly what you seek. If you can express it mathmatically, that would be great. If you can provide an image of the kind of plot you hope to get, that would be great. If you explain the meaning of the data (what physical quantities are represented by x, y, z, volume, and "color") and what you hope to learn from a visual representation of the data, that would be even better.

I meant interpolation. it schuld look like FEM result. For each node I have X, Y, Z, CellSize and the StressValue

@Mad Gano, Here is an example of an FEM result, in which a value such as stress is known at each point in a mesh, and the plot shows that stress as color, interpolated across the mesh. It is from this discussion.

Is this what you want? The plot above is for a 2D mesh, but your nodes are in 3D. There is no easy way to plot stress with color in 3D, because that makes a 4D plot (x,y,z,stress). You can do it by a) plotting stress on a plane that slices through the 3D volume, or b) by plotting stress on a surface that exists in 3D.

If you want a), then you need to interpolate in 3D. Matlab's interp3() does that, but the input data needs to be defined at all points on a 3D grid of points, and yours is not. You will also need to define the plane of the slice. This can be done by specifying 3 locations in the plane, or by specifying one point in the plane and a normal vector.

If you want b), you need to define the mesh with a mesh data structure. Basically this is a list of coordinates and a list of triangular faces, where each face is defined by a set of 3 corner numbers . See here for an example. See here to learn how to generate 2D and 3D meshes in Matlab.

If you can provide an image that is like what you want, that would probably help.

thank you william I appreciate your support

@Mad Gano, you are welome. Good luck with your work.