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hi friends, I want to view an .obj file on a 3D plot with matlab, not displaying the content, it is been 3 day i search but worthless. Thank you for help.

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Walter Roberson
Walter Roberson 2015-9-19

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jiji hr
jiji hr 2015-9-19
in fact it doesn't really answer my question because i don't have texture in my object files but i don't know if i can adapt it to my case (i am a biginner with matlab). any way i will try with. and thank you a lot for your answer.
jiji hr
jiji hr 2015-9-19
if i understood the source code very well i think it takes an image then it parses it in an .obj file, but my problem is that i have an .obj file and i want to know how can i get the 3D model from. This .obj file does not contain texture.
Walter Roberson
Walter Roberson 2015-9-19
The readobj will return an empty .vt field if the .obj file has no texture information. It will not be a problem.
If I understand the code it looks to me as if you could use
obj = readobj('FileName.obj'); %use appropriate file
patch('vertices', obj.v, 'faces', obj.f.v);
shading interp
colormap(gray(256));
lighting phong
camproj('perspective');
axis square
axis off
axis equal
axis tight
cameramenu
However I do not know how the color will come out.
Here readobj is the code from the first of the two links above.
Image Analyst
Image Analyst 2015-9-19
I don't have readobj(). What toolbox is it in? What program created the obj file in the first place? I know Visual Studio creates obj files but I doubt you'd want to open them in MATLAB.
Walter Roberson
Walter Roberson 2015-9-20
readobj is here
Somendra Meena
Somendra Meena 2020-2-27
lineno:2 is giving me an error
Error using patch
Value must be of numeric type and greater than 1
Error in read3dModel (line 13)
patch('Faces', obj.f.v, 'vertices', obj.v);
I'm using this model for sample : https://free3d.com/3d-model/hand-v1--945174.html
And this code for readObj function http://www.mathworks.com/matlabcentral/fileexchange/18957-readobj
Walter Roberson
Walter Roberson 2020-2-27
What is class(obj.v) and also size()? I wonder if it is []
Gayathri
Gayathri 2022-7-27
Hi Roberson,
In relation to this question, I want to know how to detect a new object and validate(extract features like colour, dimensions, texture etc; compare and validate) it with a reference obj file using the above set of code?
How can I give the colour of the new object and how similar it is with the reference obj file.
Can I say how much does the material resemble with mtl file of the reference obj file?
Walter Roberson
Walter Roberson 2022-7-28
@Gayathri
I do not understand about "detect a new object" ? The above code is for reading and displaying whatever is in a .obj file, not for deciding which entry has what meaning.

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Mariem Khlifi
Mariem Khlifi 2022-3-5

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toolbox_graph has a function read_obj that does that.

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