我正试图为一颗绕地球运行的卫星的轨道（7000公里高度的圆形轨道）制作动画。以下矢量x，y，z表示它在参考系中的坐标（由非球面引力势引起的加速度积分而得）。
fh = figure('DoubleBuffer','on');
ah = axes('Parent',fh,'Units','normalized','Position',[0 0 1 1],...
'DataAspectRatio',[1 1 1],'DrawMode','fast');
x = 1.0e+003 * [ 1.293687086462776 1.355010603320554 ...
1.416226136451621 1.477328806662750 1.538313743926646...
1.841302933101510 2.140623861743577 2.435680048370655...
2.725883985836056 3.830393161542639 4.812047393962632...
5.639553477924236 6.285935904692739 6.778445814703028...
6.981534839226300 6.886918327688911 6.496619397538814...
5.886899070860056 5.061708852126299 4.051251943168882...
2.891621923700204 1.551975259009857 0.148687346809817...
-1.259946709379085 -2.614876359324573 -3.789635985368149...
-4.822735075152957 -5.675398819678173 -6.314344260262741...
-6.725008970265510 -6.860046738669579 -6.714044347581475...
-6.291232549137548 -5.646225528669501 -4.790489239458692...
-3.756316068441812 -2.581710448683235 -1.257064527234605...
0.118190083177733 1.488198207705392 2.797262268588749...
3.943218990855596 4.943060241667732 5.760107224604901...
6.363435161221018 6.741208871652011 6.844507242544970...
6.669637491855506 6.222229021788314 5.549112743364572...
4.665587166679964 3.605338508383659 2.407805301565781...
1.076891826523990 -0.297413079432155 -1.658804233546807...
-2.950960371016551 -4.105336427038419 -5.093651475630134...
-5.875676956725480 -6.417825276834068 -6.694317613708315...
-6.702354075060146 -6.441476385534835 -5.920328191821120...
-5.149356931765655 -4.165756794143557 -3.010476122311884...
-1.730623521107957 -0.547981318845428 0.651933236927557...
1.830754553013015 2.950797411065132];
y = 1.0e+003 *[ -6.879416537989226 -6.867600717396513...
-6.855237614338527 -6.842328214064634 -6.828873545169439...
-6.753459997528374 -6.664593892931937 -6.562452270514113...
-6.447238135027323 -5.857768973060929 -5.080802144227667...
-4.141502963266585 -3.069449548231363 -1.712593819793112...
-0.283073212084787 1.157789207734001 2.547934226666446...
3.733185664633135 4.781256997101091 5.653507474532885...
6.316540958291930 6.760480121739906 6.924451844039825...
6.801366712306432 6.393950562012035 5.763652137956600...
4.918852380803697 3.890903548710424 2.717191733101876...
1.385839187748386 -0.001786735280855 -1.388680800030854...
-2.717513794724399 -3.877348086956174 -4.892062889940518...
-5.723943344458780 -6.341064412332522 -6.729295147896739...
-6.844976271597333 -6.684181367561298 -6.252308741323985...
-5.600523241569850 -4.741636145151388 -3.707934368103928...
-2.537101251915556 -1.208445066639178 0.169057351189467...
1.539102816836380 2.845512534980855 3.993289528709769...
4.989150886098799 5.795183343929699 6.379362665363127...
6.723976759736427 6.794165677259719 6.586864956951024...
6.108394444576384 5.387403581100790 4.449452017586583...
3.332306147336086 2.080126804848620 0.757432563194591...
-0.595089763589023 -1.923045482863719 -3.172486599444496...
-4.302442851663575 -5.254127434062967 -5.988250483410006...
-6.472859710456819 -6.675113607083117 -6.664054266658221...
-6.440275312105615 -6.010308893159839];
z = [ -1.348762314964606 -1.416465504571016 -1.484053975854905...
-1.551522350691171 -1.618865254528658 -1.953510294130345...
-2.284215283426580 -2.610320163346533 -2.931177500785390...
-4.153679292291825 -5.242464339076090 -6.162825517200489...
-6.884797354552217 -7.440577139596716 -7.680358197465111...
-7.594616346122523 -7.183952381870657 -6.529293328494871...
-5.637062917332294 -4.540678277777376 -3.279180600545935...
-1.817413221203883 -0.280548741687378 1.268253040429052...
2.764251377698321 4.066975661566477 5.218214283582148...
6.174673504642019 6.899157495671121 7.375688520371054...
7.548875108319217 7.410793523141250 6.965068314483629...
6.271309946313485 5.343254095742233 4.215431448848456...
2.928028129903598 1.469574073877195 -0.048649548535536...
-1.563638474934283 -3.013536101911645 -4.285161526803897...
-5.397128342069014 -6.308837263463213 -6.985946890567337...
-7.415475222950275 -7.542406523585701 -7.363021555333582...
-6.884639818710263 -6.158276823110702 -5.199186592259776...
-4.043958234344444 -2.736923814690622 -1.283388986878655...
0.219908617803070 1.712828428793243 3.135072606759898...
4.411790351254605 5.510842969067953 6.387336537361380...
7.004133661144990 7.332163450286972 7.366696289243980...
7.105258174916579 6.555393588532904 5.727091807637045...
4.660073989309112 3.399622357708514 1.999243120787114...
0.701744421660999 -0.620073499615723 -1.923270654698332...
-3.164705887374677 ];
load('topo.mat','topo','topomap1');
[x1,y1,z1] = sphere(50);
x1 = 6678.14*x1;
y1 = 6678.14*y1;
z1 = 6678.14*z1;
props.AmbientStrength = 0.1;
props.DiffuseStrength = 1;
props.SpecularColorReflectance = .5;
props.SpecularExponent = 20;
props.SpecularStrength = 1;
props.FaceColor= 'texture';
props.EdgeColor = 'none';
props.FaceLighting = 'phong';
props.Cdata = topo;
surface(x1,y1,z1,props);
light('position',[-1 0 1]);
light('position',[-1.5 0.5 -0.5], 'color', [.6 .2 .2]);
view(3);
handles.p1 = line('parent',ah,'XData',x(1),'YData',y(1),'ZData',...
z(1),'Color','red','LineWidth',2);
handles.p2 = line('parent',ah,'XData',x(end),'YData',y(end),...
'ZData',z(end),'Marker','o','MarkerSize',6,'MarkerFaceColor','b');
oaxes([0 0 0],'Arrow','extend','AxisLabelLocation','side',...
'Xcolor','green','Ycolor','green','Zcolor','green');
axis vis3d equal;
handles.XLim = get(gca,'XLim');
handles.YLim = get(gca,'YLim');
handles.ZLim = get(gca,'ZLim');
set([handles.p1,handles.p2],'Visible','off');
xmin = handles.XLim(1);
ymin = handles.YLim(1);
zmin = handles.ZLim(1);
xmax = handles.XLim(2);
ymax = handles.YLim(2);
zmax = handles.ZLim(2);
set(ah, 'XLim', [xmin xmax],'YLim', [ymin ymax],'Zlim',[zmin zmax]);
view(3);
handles.hsat = line('parent',ah,'XData',x(1), 'YData',y(1),...
'ZData',z(1),'Marker','o', 'MarkerSize',6,'MarkerFaceColor','b');
k = uint8(2);
u2 = uint8(length(x));
while k<u2
handles.htray(k) = line([x(k-1) x(k)],[y(k-1) y(k)],[z(k-1) z(k)],...
'Color','red','LineWidth',3);
set(handles.hsat,'XData',x(k),'YData',y(k),'ZData',z(k));
drawnow;
k = k + 1;
end
其中oaxes是一个FEX应用程序，允许获取位于PlotBox原点（0,0,0）的轴（在本例中）。
我已经阅读了Matlab帮助浏览器中的用户指南的图形部分。它建议使用低级函数来加速图形输出（这就是我使用线函数而不是plot3的原因），并使用渲染器绘制线图形。就我而言，我不能使用它，因为我的表面（地球）没有被它很好地绘制出来。我想得到类似的东西（我试图与作者联系，但没有得到回应）。最终的结果是一个缓慢的（在我的微处理器intel core i5的计算机中需要11.4秒）和不连续的动画（也许我需要更多的点来获得蓝色点的移动看起来像是连续的，但积分器的输出点是不变的）。我想知道我应该做些什么来改进它。谢谢你的关注。干杯
这里有几件事。
- DrawMode=fast可能不会像你想象的那样。它正在关闭深度搜索。我想你真的很想在这里做深度搜索
- 您正在内部循环中创建线对象。您确实希望创建少量图形对象并重用它们。您可以创建一个单行对象并设置XData、YData和&ZData，在循环中
- 您可以使用hgtransform来避免修改hsat的坐标（如本文所述），但这只会在hsat更复杂的情况下产生影响。在这种情况下，我认为这不会给你带来任何好处
- 您可以降低曲面的分辨率
- 您可能希望将地物的"渲染器"属性设置为OpenGL
在这种情况下，但使用您的代码，我的系统每秒可以获得近20帧。在做出这些改变之后，我每秒得到大约100帧。你在这里拍摄的帧速率是多少？
我相信你的动画速度慢的主要原因是因为你使用的Phong照明算法计算成本很高。要查看它对性能的影响，请尝试指定Gouraud着色：
%#lighting('gouraud');
props.FaceLighting = 'gouraud'; %# faster interpolating method