.mat file w/ vertices of 3D image inputted into axes in GUI

I have a GUI with an axes box, and I have a file V.mat which contains the vertices of a 3D image. How do I make this 3D image show up in the axes?

[Walter Roberson]

What is a "3d image" for this purpose?

[Golnar]

"a point cloud" [x, y, z] of a pressure ulcer, obtained by projecting Structured Light patterns on a wound and capturing via webcam the distortions in the pattern

[Golnar]

V.mat is a 49358 x 3 matrix of 0's and 1's

Answer 1

[Walter Roberson]

pointsize = 20;  %adjust as needed

scatter3(V.mat(:,1), V.mat(:,2), V.mat(:,3), pointsize)

However I am confused now about whether it is [x, y, z] coordinates, or if it is "0's and 1's": if it is 0's and 1's then it is not clear what the x y or z values would be.

[Golnar]

Walter, I don't know if you're familiar w/ GUI functioning (I certainly am not), but I need to insert some type of handle for it to work, I think the term GCBO is relevant. I'm going to look into it. But this does not produce results

[Golnar]

Running it in the command window gives this, despite V.mat existing in the workspace

[Joseph Cheng]

Walter was not being literal when he was saying to use V.mat(:,1). He was saying you can

scatter3(V(:,1), V(:,2), V(:,3), pointsize)

[Golnar]

what is point size supposed to represent?

[Joseph Cheng]

size represents the size of the point in the scatter plot

[Walter Roberson]

You had posted "V.mat is a 49358 x 3 matrix of 0's and 1's" so yes, I did mean V.mat

Perhaps what you meant was that the file V.mat contains a variable that has that structure. If so then we would need to know the name of the variable in order to code appropriately. You can use

whos -file V.mat

in order to see the list of variables in the file.

With regards to loading the data in one place and plotting it in another:

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F

I still don't understand how your (x,y,z) and color are to relate together to be plotted.

Answer 2

[Joseph Cheng]

From your screenshot you will not be able to do it there. Are you trying to plot this when it opens? Push of a button?

Where ever you are trying to do this you need to do something like this

handles.axes1; %handles. (tag of the axes)
pointsize=20;
scatter3(V(:,1),V(:,2),V(:,3),pointsize);

now depending on where you want to do this you'll need to do it when V is defined.

When/where do you want to plot the scatter? and when/where/how is V.mat loaded?

[Joseph Cheng]

Also for clearification this is what you want to do can you paste in a screen shot of what V(1:10,:) looks like

[Golnar]

Joseph, I have a 'Generate 3D Image' button which is of tag 'calculate'. This button should make the image appear in the axes. V.mat is loaded here in the GUI function:

[Golnar]

My GUI:

[Golnar]

[Joseph Cheng]

then for simplicities sake

within the reset__callback after you load(V.mat):

load(V.mat);
handles.V = V; %store V within handles (dunno if this is best practices but i do it.
guidata(hObject, handles); %update handles globally so we can use it in another function.

in the calculate_callback(hObject, eventdata, handles, varargin)

V=handles.V; %don't have to do this but makes it shorter to type. 
handles.axes1; %handles. (tag of the axes) : sets the active axes to the one you want to use. 
pointsize=20; %set point size to 20 
scatter3(V(:,1),V(:,2),V(:,3),pointsize); %scatter plot V data.

[Joseph Cheng]

I do not know what type of plot you want for that type of data. Its definitely not a [x,y,z] unless the first 18 are just the same point. well if you figure out what type of plot/scatter/image/surface. just substitute scatter3 with what you're trying to do.

[Golnar]

Joseph, I'm waiting on some more files before attempting to run it through the GUI. For now I'm going to just manually try and get the plot.

pointsize=20; 
scatter3(V(:,1),V(:,2),V(:,3),pointsize);

returns this:

I have a COLOR.mat and an index.mat file as well that I'm now thinking relate to making this work. This is COLOR:

This is index.mat (just 1-49358):

[Joseph Cheng]

oh ok, check back when you get more stuff. i just wasn't sure what type of 3d plot with that much data and i see you only had 3 unique points.