How do I extract an entire 3D graph from MATLAB?

Hello everyone!

I'm working on a Augmented Reality project and I need to use a 3D graph from MATLAB in another software. This graph has the same geometry of the front surface of a physical curved object, i.e. a sector of cylinder. I explain my goal:

when I target the sector of cylinder with a camera, I want my 3D Graph/map appears on its surface in AR as a skin or a texture.

So I'd like to know if there is a way to extract the entire map, in order to use it in anyway I want.

I thank you in advance for your help!

Answer 1

[Star Strider]

I’m not exactly certain what the desired result is, however in a surf plot for example, the surface object hass the information —

[X,Y,Z] = peaks;

figure
hs = surf(X, Y, Z)                                      % Create Handle To 'surface' Object

hs = 
  Surface with properties:

       EdgeColor: [0 0 0]
       LineStyle: '-'
       FaceColor: 'flat'
    FaceLighting: 'flat'
       FaceAlpha: 1
           XData: [49×49 double]
           YData: [49×49 double]
           ZData: [49×49 double]
           CData: [49×49 double]

  Show all properties

grid on

So for example to get the ‘ZData’ matrix —

Z_surf = hs.ZData

Z_surf = 49×49

0.0001 0.0001 0.0002 0.0004 0.0007 0.0011 0.0017 0.0025 0.0034 0.0043 0.0051 0.0052 0.0042 0.0010 -0.0050 -0.0151 -0.0299 -0.0500 -0.0752 -0.1049 -0.1373 -0.1703 -0.2010 -0.2268 -0.2450 -0.2539 -0.2527 -0.2419 -0.2228 -0.1976 0.0001 0.0002 0.0004 0.0006 0.0010 0.0017 0.0026 0.0037 0.0051 0.0064 0.0073 0.0070 0.0046 -0.0013 -0.0123 -0.0299 -0.0555 -0.0898 -0.1327 -0.1828 -0.2373 -0.2924 -0.3437 -0.3862 -0.4161 -0.4302 -0.4276 -0.4087 -0.3761 -0.3332 0.0002 0.0003 0.0005 0.0009 0.0016 0.0025 0.0038 0.0055 0.0074 0.0091 0.0101 0.0091 0.0045 -0.0059 -0.0244 -0.0537 -0.0959 -0.1520 -0.2217 -0.3028 -0.3908 -0.4795 -0.5616 -0.6296 -0.6769 -0.6989 -0.6937 -0.6625 -0.6090 -0.5392 0.0002 0.0004 0.0008 0.0014 0.0023 0.0036 0.0055 0.0079 0.0105 0.0128 0.0138 0.0116 0.0037 -0.0131 -0.0427 -0.0889 -0.1549 -0.2425 -0.3510 -0.4767 -0.6130 -0.7502 -0.8769 -0.9816 -1.0541 -1.0873 -1.0784 -1.0292 -0.9456 -0.8368 0.0003 0.0006 0.0011 0.0019 0.0032 0.0051 0.0077 0.0110 0.0147 0.0178 0.0188 0.0150 0.0028 -0.0227 -0.0671 -0.1362 -0.2346 -0.3648 -0.5260 -0.7127 -0.9150 -1.1186 -1.3066 -1.4619 -1.5692 -1.6183 -1.6047 -1.5311 -1.4063 -1.2440 0.0004 0.0008 0.0015 0.0026 0.0044 0.0070 0.0106 0.0151 0.0201 0.0244 0.0257 0.0204 0.0031 -0.0328 -0.0955 -0.1931 -0.3322 -0.5166 -0.7450 -1.0101 -1.2975 -1.5872 -1.8552 -2.0768 -2.2305 -2.3012 -2.2825 -2.1782 -2.0008 -1.7696 0.0005 0.0010 0.0019 0.0034 0.0058 0.0093 0.0141 0.0203 0.0272 0.0333 0.0357 0.0294 0.0074 -0.0396 -0.1224 -0.2521 -0.4382 -0.6860 -0.9942 -1.3531 -1.7436 -2.1385 -2.5050 -2.8095 -3.0220 -3.1215 -3.0991 -2.9593 -2.7192 -2.4049 0.0007 0.0013 0.0024 0.0043 0.0073 0.0118 0.0182 0.0266 0.0361 0.0451 0.0500 0.0445 0.0197 -0.0364 -0.1379 -0.2995 -0.5340 -0.8491 -1.2440 -1.7066 -2.2129 -2.7277 -3.2083 -3.6104 -3.8941 -4.0312 -4.0090 -3.8328 -3.5242 -3.1175 0.0007 0.0015 0.0028 0.0051 0.0088 0.0145 0.0227 0.0337 0.0468 0.0603 0.0698 0.0684 0.0452 -0.0146 -0.1285 -0.3154 -0.5921 -0.9694 -1.4478 -2.0139 -2.6390 -3.2799 -3.8835 -4.3937 -4.7596 -4.9441 -4.9299 -4.7220 -4.3468 -3.8464 0.0008 0.0015 0.0030 0.0056 0.0100 0.0168 0.0270 0.0410 0.0588 0.0785 0.0959 0.1035 0.0888 0.0350 -0.0791 -0.2766 -0.5790 -1.0012 -1.5465 -2.2015 -2.9344 -3.6950 -4.4203 -5.0422 -5.4980 -5.7407 -5.7466 -5.5195 -5.0892 -4.5057

.

[Giorgio Morello]

First of all, thank you for your time!

Anyway, I forgot to specify that I have a trisurf plot.

So I'm wondering if exists a way to obtain a .stl or .obj file (or something like that) from it, because I need to visualize both the shape and the colors of this plot in AR, as laying on the corresponding sample surface.

Just an example: if I have a texture or a .obj file (like the one in the right of the screenshot), I can "paste" it on the surface of a solid object.

I = imread('sampleimage.jpg')

I = 500×821×3 uint8 array
I(:,:,1) =

     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2    53    48    29     5     0     4     7     2    32    55    36    30    66    98    86    35    37    37    42    50    53    52    51    54    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53    53
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imshow(I)

[Star Strider]

Yes, details are very important and that was a significant oversight.

I very rarely use trisurf plots.

The easiest way to find out what can be retrieved is to do that experiment —

[x,y] = meshgrid(1:15,1:15);
z = peaks(15);
T = delaunay(x,y);
hts = trisurf(T,x,y,z);

tsprops = get(hts)                                          % TRISURF Properties For This Object

tsprops = struct with fields:
                       CData: [3×392 double]
                CDataMapping: 'scaled'
             FaceVertexCData: [225×1 double]
                   EdgeColor: [0 0 0]
                   FaceColor: 'flat'
                       Faces: [392×3 double]
                   LineStyle: '-'
                   LineWidth: 0.5000
                    LineJoin: 'miter'
               VertexNormals: []
           VertexNormalsMode: 'auto'
                 FaceNormals: []
             FaceNormalsMode: 'auto'
             AmbientStrength: 0.3000
             DiffuseStrength: 0.6000
            SpecularStrength: 0.9000
            SpecularExponent: 10
    SpecularColorReflectance: 1
                      Marker: 'none'
             MarkerEdgeColor: 'auto'
             MarkerFaceColor: 'none'
                  MarkerSize: 6
                    Vertices: [225×3 double]
                    Clipping: on
          AlignVertexCenters: off
            AlphaDataMapping: 'scaled'
         FaceVertexAlphaData: []
                   EdgeAlpha: 1
                   FaceAlpha: 1
                       XData: [3×392 double]
                       YData: [3×392 double]
                       ZData: [3×392 double]
                FaceLighting: 'flat'
                EdgeLighting: 'none'
            BackFaceLighting: 'reverselit'
                    Children: [0×0 GraphicsPlaceholder]
                      Parent: [1×1 Axes]
                     Visible: on
            HandleVisibility: 'on'
               ButtonDownFcn: ''
                 ContextMenu: [0×0 GraphicsPlaceholder]
                  BusyAction: 'queue'
                BeingDeleted: off
               Interruptible: on
                   CreateFcn: ''
                   DeleteFcn: ''
                        Type: 'patch'
                         Tag: ''
                    UserData: []
                    Selected: off
          SelectionHighlight: on
                     HitTest: on
               PickableParts: 'visible'
                 DisplayName: ''
                  Annotation: [1×1 matlab.graphics.eventdata.Annotation]

This details all the information it is possible to get from the trisurf plot.

Specifically, use structure (‘dot’) referencing to get the information.

For example ‘ZData’ —

Z = tsprops.ZData

Z = 3×392

0.0071 -0.1709 -0.6534 -0.0181 -2.7802 -0.2309 1.6922 0.1454 0.0166 3.0580 -0.0012 0.1984 2.5872 6.5152 -1.3971 -6.0419 0.0456 0.0957 -1.2830 1.9419 1.3119 -0.8775 -0.9128 -2.4323 0.0005 -1.2571 -0.0029 -1.2571 -3.4722 -0.1563 0.0052 -0.0724 -0.1709 -0.2010 -1.0906 -0.9336 -0.6991 0.0456 0.0084 1.4214 -0.0009 0.4080 -0.9372 5.5906 0.6523 -3.7675 0.0071 -0.1032 -2.7806 0.9810 1.9727 -0.9128 0.8640 -0.8775 0.0020 -3.7675 -0.0405 -2.4323 -0.9372 -0.2450 0.0244 -0.2290 -0.2290 -0.1152 1.4214 -0.2010 3.4240 0.0473 0.0023 2.5872 -0.0000 0.9810 3.0580 6.7194 -1.0906 -3.5908 0.0244 -0.8775 -3.6254 1.6922 2.1412 0.0957 0.7341 -0.8263 0.0003 -2.4323 0.0154 -0.8263 0.8640 -0.8263

Then, do whatever is necessary with the extracted information to produce the desired result.

.

[Giorgio Morello]

Thank you for your answer, I'll let you know if I can!

[Star Strider]

My pleasure!

I very much hope it works!

If it does not, and since no one else responded to this, if there are problems, use the Contact Support option and then please post back here with the solution MathWorks provides. In the request, include the URL of this thread so that it will not be necessary to repeat everything, and MathWorks has the posted information and knows what has already been attempted.

.