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POMaking movie: position of camera & multiple scenes
 

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  1. POMaking movie: position of camera & multiple scenes
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    <p>This is an example code that represents what I need to do:</p> <pre><code>ang=0:0.01:2*pi; r = 1; xp=r*cos(ang); yp=r*sin(ang); frequency = 1/0.016; % real frequency datalength = length(ang); % n° of points scale = 10; % resampling nFrames = floor(datalength/scale); % figure figure() set(gcf, 'Color','white') hold on axis equal set(gca, 'nextplot','replacechildren', 'Visible','off'); % ? % preallocate mov(1:nFrames) = struct('cdata',[], 'colormap',[]); % create movie for k = 1:nFrames axes(gca); cla; hold on plot3(xp,yp,zeros(size(xp))); plot3(1,0,0,'kx'); % Update Target for j = 1:scale id = (k-1)*scale + j; CurTar = ang(id); PsiTar = CurTar + pi*0.5; end % Plot obj plot3(2*xp(id),2*yp(id),0,'k.','LineWidth',4) % Plot Target plot3(xp(id),yp(id),0,'r.','LineWidth',3) a = -PsiTar - 0.75*pi; % Set Camera xc = xp(id) - sin(a); yc = yp(id) - cos(a); zc = 0.5; campos([xc,yc,zc]) camtarget([xp(id),yp(id),0]) mov(k) = getframe(gcf); end close(gcf) movie2avi(mov, 'mymovie', 'fps', round(frequency/scale)); </code></pre> <p>I have the following problems/questions with it:</p> <ul> <li><p>I would like to plot the circle once, and not every loop. I tried to place it before the <code>for</code> loop, but at that point is not maintained at each iteration, unless I comment out the <code>axes(gca); cla;</code> line, but this has a significant other drawback: everything is maintained, not only the circle.</p></li> <li><p>I would like to have the same scene seen from multiple angles. I know how to do subplots and I would know how to plot the same thing multiple times and simply set the camera differently, is there a way of plotting once and having multiple projections?</p></li> <li><p>I have a problem with the position of the camera. You see that I have that <code>sin</code> and <code>cos</code> in the definition of <code>xc</code> ynd <code>yc</code>. In this example everything is fine, but the same code in my full script leads to the error :</p> <pre><code>??? Error using ==&gt; set Value must be a 3 element numeric vector Error in ==&gt; campos at 50 set(ax,'cameraposition',val); </code></pre> <p>how may I get rid of it? I have printed to screen all values and they are numerical, I have no idea what might be happening.</p></li> </ul> <p><strong>EDIT:</strong></p> <p>additional question</p> <p>If I plot the following</p> <pre><code>for k = 1:nFrames axes(gca); cla; hold on plot3(zeros(length(ang)),ang,zeros(length(ang)),'b') % Update Target for j = 1:scale id = (k-1)*scale + j; end % Plot obj plot3(0,2*yp(id),0,'k.','LineWidth',4) if k==1 view(0,0) camzoom(50) end camtarget([0,yp(id),0]) end close(gcf) </code></pre> <p>you can see that the camera is not aligned with the <code>y</code> axis, otherwise you would not see the blue line. Why is that? how is it possible to avoid it?</p>
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