在Matlab中围绕固定点的3D球体旋转
问题描述:
我有一个以球轴为原点的球体。我使用rotate3d函数来允许其旋转。但是,当我旋转它时,它似乎在具有旋转的固定点的空间中移动。我想将原点固定为旋转中心。我怎样才能实现它?在Matlab中围绕固定点的3D球体旋转
这里是我的代码:
function ex
global state;
fh = figure('Menu','none','Toolbar','none','Units','characters',...
'Renderer','OpenGL');
hPanAni = uipanel('parent',fh,'Units','characters','Position',...
[22.6 10.4 53 23],'title','Controls','FontSize',11,...
'FontAngle','italic','FontWeight','bold');
hIniAni = uicontrol(hPanAni,'Style','pushbutton','Units','normalized',...
'Position',[0.14 0.75 0.5 0.12],'String','Spin',...
'FontSize',10,'Callback',@hIniAniCallback);
hFinAni = uicontrol(hPanAni,'Style','pushbutton','Units','normalized',...
'Position',[0.14 0.5 0.5 0.12],'String','Stop',...
'FontSize',10,'Callback',@hFinAniCallback);
hResetAni = uicontrol(hPanAni,'Style','pushbutton','Units','normalized',...
'Position',[0.14 0.25 0.5 0.12],'String','Reset',...
'FontSize',10,'Callback',@hResetAniCallback);
hPantSim = uipanel('Parent',fh,'Units','characters',...
'Position',[107.87 8 157.447 42],'BorderType','none','title',...
'Screen','FontSize',11,'FontAngle','italic',...
'FontWeight','bold');
hPantSimInt = uipanel('Parent',hPantSim,'Units','normalized','Position',...
[0 0 1 1],'BorderType','line','BackgroundColor','k');
axes('units','normalized','position',[0,0,1,1],'Parent',...
hPantSimInt);
stars = rand(60,2);
scatter(stars(:,1),stars(:,2),6,'y','Marker','+');
axis off;
ah4 = axes('Parent',hPantSimInt,'Units','normalized','Position',...
[0 0 1 1],'Color','none','Visible','off','DataAspectRatio',...
[1 1 1],'NextPlot','add');
T1 = 0:pi/1000:2*pi;
Fin = numel(T1);
if (Fin>1000)
Incr = floor(Fin/1000);
else
Incr = 1;
end
Y = zeros(numel(T1),3);
Y(:,1) = 7000*cos(T1);
Y(:,2) = 7000*sin(T1);
R_esf = 6378;
[x_esf,y_esf,z_esf] = sphere(50);
x_esf = R_esf*x_esf;
y_esf = R_esf*y_esf;
z_esf = R_esf*z_esf;
props.FaceColor= 'texture';
props.EdgeColor = 'none';
props.Parent = ah4;
surface(x_esf,y_esf,z_esf,props);
handles.psat = line('parent',ah4,'XData',Y(1,1), 'YData',Y(1,2),...
'ZData',Y(1,3),'Marker','o', 'MarkerSize',10,'MarkerFaceColor','b');
line([0 1.5*R_esf],[0 0],[0 0],'LineWidth',3,'Color','g');
line([0 0],[0 1.5*R_esf],[0 0],'LineWidth',3,'Color','g');
line([0 0],[0 0],[0 1.5*R_esf],'LineWidth',3,'Color','g');
pbaspect([1 1 1]);
axis vis3d;
rotate3d(ah4);
view([atan2(Y(1,2),Y(1,1)),0]);
az = 0;
k = 2;
ind_ini = 0;
state = 0;
function hIniAniCallback(hObject,evt)
tic;
if (ind_ini == 1)
return;
end
ind_ini = 1;
state = 0;
while (k<=Fin)
set(handles.psat,'XData',Y(k,1),'YData',Y(k,2),'ZData',Y(k,3));
pause(0.002);
if (k == Fin)
toc;
end
k = k + Incr;
if (state == 1)
state = 0;
break;
end
end
end
function hFinAniCallback(hObject,evt)
ind_ini = 0;
state = 1;
end
function hResetAniCallback(hObject,evt)
set([handles.psat],'Visible','off');
ind_ini = 0;
state = 1;
az = 0;
k = 2;
handles.psat = line('parent',ah4,'XData',Y(1,1), 'YData',Y(1,2),...
'ZData',Y(1,3),'Marker','o', 'MarkerSize',10,'MarkerFaceColor','b');
end
end
答
的问题是,3D旋转相对于做你的轴的中心,而不是相对于原点。在轴上添加绿线之后,x,y,z轴的极限会自动更改,球体的中心不再位于图形的中心。绘制所有行后,添加以下行:
ax_limits = 2*[-R_esf R_esf];
set (ah4, 'xlim', ax_limits, 'ylim', ax_limits, 'zlim', ax_limits)
'2'因子只是为了防止球体紧紧地填满你的轴。您可以将其设置为您需要的任何值。
+0
非常感谢您的回答。 – julian 2012-01-05 12:20:33
你能澄清一下你的问题吗?目前尚不清楚你目前所描述的行为是什么,以及你希望取而代之的是什么。 – 2012-01-04 23:07:35
我同意。也许你应该展示一些图片。 – Oli 2012-01-04 23:08:59
谢谢你的评论。我刚刚添加了显示我的问题的代码。如果你用鼠标旋转球体,你会看到它随着它的移动而移动,甚至它看起来离开了屏幕窗口。我希望当我旋转球体时,这看起来像是固定的,剩下的物体在它周围移动。 – julian 2012-01-05 12:16:58