我想使用MATLAB制作3D画家。
首先我想显示3个面板- XY
,XZ
和YZ
意见。
用户将在每个面板中绘制他想要的内容。
之后,他将单击按钮来组合这3个视图,并从这些面板中获得3d模型。他还可以自由渲染此模型。
我怎样才能做到这一点?
这些图片说明了我想要的:
2D视图:
合并3个视图后的3D对象:
I am assuming that you only want to specify 3D lines and no solid blocks (as in the linked example). There I see a small problem: after specifying the XY and XZ projections, you have a x, y and z value for each point on the curve, so the YZ projection is already defined. It is therefore enough to specify only the XY and XZ dimension. Here's how to do that:
To get a graphical input from the user, you can use the ginput
function, which creates a figure and allows the user to select points:
[x,y,btn] = ginput(k);
where x
and y
are the coordinates of the selected points, btn
the ASCII code of any clicked button, and k
is the number of points to get. You can let the user draw something and let the drawing end by pressing the space bar by:
figure; axis([0 1 0 1]); % create empty figure
button=0; k=1; % set start values
while button~=' ' % repeat until space is pressed
[x(k) y(k), button] = ginput(1); % get one point
k=k+1; % set k for next iteration
plot(x,y);axis([0 1 0 1]); % plot the curve
end
您可以重复两次以获取XY和XZ视图。假设您将坐标保存到变量中
(x1, y1) % the XY view
(x2, z2) % the XZ view
现在,您可以通过创建x
矢量并对所有y
和z
值进行插值来创建最终的3D曲线。为了获得良好的平滑曲线,我建议使用样条插值法:
x = 0:0.01:1;
y = interp1(x1,y1,x,'spline','extrap'); % Spline interpolation + extrapolation
z = interp1(x2,z2,x,'spline','extrap'); % Spline interpolation + extrapolation
现在,只需使用plot3
函数将其绘制在3D中即可:
plot3(x,y,z);
您可以轻松地扩展此最小示例以执行所需的任何操作,这只是为了展示MATLAB中的基本步骤和可能性。
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