创建轴中心不同的圆柱体 [英] Creating a cylinder with axis centered differently

问题描述

我知道 Matlab 有一个称为圆柱体的函数，当沿圆周的点数和半径长度时，它可以为圆柱体创建点.如果我不想要一个单位圆柱体，也不希望它以默认轴为中心(例如沿 z 轴)怎么办?创建这样一个圆柱体的最简单方法是什么?提前致谢.

I know Matlab has a function called cylinder to create the points for a cylinder when number of points along the circumference, and the radius length. What if I don't want a unit cylinder, and also don't want it to center at the default axis (for example along z-axis)? What would be the easiest approach to create such a cylinder? Thanks in advance.

推荐答案

前面的答案很好，但是你可以让matlab为你做更多的工作(因为圆柱体的结果分开x,y,z 组件，您需要使用 little 来进行矩阵乘法以进行旋转).要使圆柱体的底部中心位于 [x0 y0 z0]，按 [xf yf xf] 缩放(使用 xf=yf 除非你想要一个椭圆柱)，使用:

The previous answer is fine, but you can get matlab to do more of the work for you (because the results of cylinder separate x,y,z components you need to work a little to do the matrix multiplication for the rotation). To have the center of base of the cylinder at [x0 y0 z0], scaled by [xf yf xf] (use xf=yf unless you want an elliptic cylinder), use:

[x y z] = cylinder;
h=mesh(x*xf+x0,y*yf+y0,z*zf+z0)

如果您还想旋转它使其不沿 z 轴对齐，请使用 rotate.例如，要围绕 x 轴 旋转 90 度，使其沿 y 轴对齐，请使用:

If you also want to rotate it so it isn't aligned along the z-axis, use rotate. For example, to rotate about the x-axis by 90 degrees, so it's aligned along the y-axis, use:

rotate(h,[1 0 0],90)

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