I'm attempting to animate a rotating sphere, however the lighting on the sphere rotates with it in certain situations. I instead want the the lighting to remain fixed with the coordinate system while the sphere rotates. Here's a gif of what my code is currently producing: Animation . Below is the code I used to produce the animation. The weird thing is this only happens with rotations about the z-axis. As can be seen in the animation, the lighting works fine for x-axis rotation.
% Simulation Time
dt = 0.05;time = 0:dt:5;% Prep Figure
figure('Color',[1 1 1],'Renderer','zbuffer','ColorMap', [1,0,0; 0,0,1])% Generate Sphere
[X,Y,Z] = sphere(20);r = 0.75*25.4;h = surf(r*X,r*Y,r*Z,Z,'FaceColor','interp');hold on% Adjust Axes, Lighting, and Shading
% axis off
axis equalview([40 25]);lgt = light('Position',[1 1 1]);set(findobj(gca,'type','surface'),... 'FaceLighting','phong',... 'AmbientStrength',.3,'DiffuseStrength',.8,... 'SpecularStrength',.9,'SpecularExponent',25,... 'BackFaceLighting','unlit','EdgeColor','k')filename = 'Rotation.gif';for n = 1:36 rotate(h,[0 0 1],10,[0 0 0]) im = frame2im(getframe(1)); [imind,cm] = rgb2ind(im,256); if n == 1; imwrite(imind,cm,filename,'gif', 'Loopcount',inf,'DelayTime',dt); else imwrite(imind,cm,filename,'gif','WriteMode','append','DelayTime',dt); endend for n = 1:36 rotate(h,[1 0 0],10,[0 0 0]) im = frame2im(getframe(1)); [imind,cm] = rgb2ind(im,256); imwrite(imind,cm,filename,'gif','WriteMode','append','DelayTime',dt); end
Best Answer