围绕特定点旋转(例如，围绕 0,0,0 旋转)

问题描述

我一直在搜索这个问题，但我真的找不到合适的答案.
我需要围绕给定点(例如，0,0,0)旋转圆柱体，但默认情况下给出圆柱体的枢轴.怎么改?

I've been searching a lot on this problem, but I couldn't really find an answer that would fit.
I need to rotate a cylinder around a given point (eg, 0,0,0), but the pivot of the cylinder is given by default. How do i change that?

我发现这个主题，这正是我想做的，但我不知道如何用java来做.

I found this topic, and it's quite what I would want to do, but I don't know how to do it with java.

为了更好地解释我想要做什么，我将展示 3 张图片.(v)

To explain better what I would like to do, I'll show 3 images.(v)

imageshack.us/photo/my-images/259/aintgood.jpg

imageshack.us/photo/my-images/840/whatineed.jpg

imageshack.us/photo/my-images/705/nogoodn.jpg

所以，第一张图片显示了我的基本问题，圆柱体的末端应该位于球体的中心，比如说 (0,0,0).用户给出两个角度.第一个用于 rotX 命令，第二个用于 rotZ 命令.圆柱体的枢轴位于其中心，因此，如图 3 所示，即使我平移圆柱体使其末端位于球体的中心，当它旋转时，整个物体都会毁掉.

So, the first image shows my basic problem, the cylinder should be positioned with the end at the center of the sphere, let's say (0,0,0). The user gives two angles. The first one is for a rotX command, the second one for a rotZ one. The pivot of the cylinder is at its center, so, as image 3 shows, even if i translate the cylinder so its end is at the center of the sphere, when it rotates, the whole thing ruins.

图 2 显示了圆柱-球体组的外观，无论给定的角度如何.图像不是基于算法得到的，而是基于微积分，鼠标旋转得到的.

Image 2 shows what the cylinder-sphere group should look like, regardless the given angles. The image is not obtained based on an algorithm, but based on calculus, and mouserotated.

问题描述

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