[英]3D rotation of a sphere around a fixed point in Matlab
我有一个以轴的原点为中心的球体。 我使用rotate3d函数允许其旋转。 但是,当我旋转它时,它似乎在具有固定旋转点的空间中移动。 我想将原点固定为旋转中心。 我该如何实现?
这是我的代码:
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
问题是3d旋转是相对于轴心而不是相对于原点进行的。 在沿轴添加绿线之后,x,y,z轴的界限会自动更改,球体的中心不再位于图形的中心。 在绘制所有线条之后添加以下线条:
ax_limits = 2*[-R_esf R_esf];
set (ah4, 'xlim', ax_limits, 'ylim', ax_limits, 'zlim', ax_limits)
“ 2”因素只是为了防止球体紧密地填充轴。 您可以将其设置为所需的任何值。
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