In the framework FEX, How do I change the projection of 3d points in a different 2D plane (currently it is in XY and want to change it to YX)

Question

VIGNESH BALAJI 2023-7-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2001812-in-the-framework-fex-how-do-i-change-the-projection-of-3d-points-in-a-different-2d-plane-currently

评论： VIGNESH BALAJI 2023-7-28

This is the FEX framework https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tools-for-fitting-conics-and-quad.

I am using it to fit a plane to my 3D data. It projects data in 2D plane xy, I like to change it to project it in yx plane.

These are the 2 lines of code used for this

pFit=planarFit(XYZ0);%Preliminary plane fit
xy0=pFit.project2D(XYZ0); %Map measured 3D samples to 2D

The implementation of project2D is like this

        function xy=project2D(obj,XYZ,type)
        %Project a set of 3D coordinates into a 2D coordinate system on the
        %fitted plane.
        %
        %    xy=obj.project2D(XYZ)
        %    xy=obj.project2D(XYZ,type)
        %in:
        %
        %   XYZ: A 3xN matrix of 3D coordinates.
        %
        %   type: A string flag, either 'position' (the default) or
        %        'direction'. 
        %        With type='position', the XYZ data are assumed
        %        to be the positions of points relative to the 3D origin.
        %        Otherwise, XYZ are assumed to be 3D direction vectors,
        %        with no specific location.
        %
        %out:
        %  xy: A 2xN matrix of projected 2D coordinates.
            if nargin<3, type='position'; end
    
            B =  obj.R(:,[2,3]);
            b0 = (obj.normal*obj.distance).';
    
            switch validatestring(type,{'position','direction'})
                case 'position'
                    xy=B.'*(XYZ-b0);
                case 'direction'
                    xy=B.'*XYZ;
            end
        end