Why does executing the Moving the Camera Through a Scene produce unwanted numerical values?

Question

Brad 2015-4-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/203712-why-does-executing-the-moving-the-camera-through-a-scene-produce-unwanted-numerical-values

评论： Brad 2015-4-15

Hi, I'm experiementing with the camera functions in MATLAB and came across the Moving the Camera Through a Scene example in MATLAB help. But I'm confused as to what a series of numbers are when they appear at the end of code execution. The code I'm using is as follows;

    %
    % Moving_Camera.m
    %
    % Clear out all workspace variables and the command window
    close all;
    clear all;
    clc;
    % load the wind data and calculate the actual wind speed
    load wind;
    wind_speed = sqrt(u.^2 + v.^2 + w.^2);
    hpatch = patch(isosurface(x, y, z, wind_speed, 35));
    isonormals(x, y, z, wind_speed, hpatch);
    set(hpatch, 'FaceColor', 'red', 'EdgeColor', 'none');
    [f vt] = reducepatch(isosurface(x,y,z,wind_speed,45),0.05); 
    daspect([1,1,1]);
    hcone = coneplot(x,y,z,u,v,w,vt(:,1),vt(:,2),vt(:,3),2);
    set(hcone,'FaceColor','blue','EdgeColor','none');
    camproj perspective ;
    camva(25);
    hlight = camlight('headlight');
    set(hpatch, 'AmbientStrength', .1,...
                'SpecularStrength', 1,...
                'DiffuseStrength', 1);
    set(hcone, 'SpecularStrength', 1);
    set(gcf, 'Color', 'k');
    lighting phong;
    set(gcf,'Renderer','zbuffer');
    hsline = streamline(x,y,z,u,v,w,78,27,11);
    xd = get(hsline,'XData');
    yd = get(hsline,'YData');
    zd = get(hsline,'ZData');
    delete(hsline);
    for i=1:length(xd)-40
      campos([xd(i),yd(i),zd(i)])
      camtarget([xd(i+5)+min(xd)/100,yd(i),zd(i)])
      camlight(hlight,'headlight')
      drawnow
    end

When the code is done running, I see the following set of values in the last frame:

What could these values represent?

Thank you.

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Answer 1

Mike Garrity 2015-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/203712-why-does-executing-the-moving-the-camera-through-a-scene-produce-unwanted-numerical-values#answer_175372

编辑：Mike Garrity 2015-4-15

I believe you're using a version of MATLAB that is older than R2014b. Is that correct?

This looks like a bug that was fixed in that version. The bug had to do with it getting confused about things that were behind the CameraPosition. I think that you're seeing the tick marks from the Y axis. If you upgrade to a newer version this should be fixed. It looks OK when I run it with R2015a.