英文:
How to rotate an object in processing according to yaw, pitch and roll values
问题
我正在尝试根据俯仰（pitch）和横滚（roll）的值旋转一个以 .obj 文件形式导入的对象。
我实际上使用了以下代码实现了这一目标：
object.rotateX(ConvertToRadians(pitch));
object.rotate(ConvertToRadians(roll), 0, 0, 1); // 这行代码基本上与 rotateZ 函数相同。我使用它是因为 rotateZ 会出现奇怪的错误。
然而，当新的俯仰和横滚值通过套接字连接传入，并且我使用以下代码时，它会在之前的旋转基础上叠加旋转。举个例子，当物体绕 X 轴旋转了 30 度，我试图使其旋转到 10 度。它会旋转到 40 度。
我尝试在给出新旋转之前保存之前的旋转，并通过以下代码撤销它：
pieta.rotateX(ConvertToRadians(pitch - prevpitch));
它似乎部分地起作用，但经过一段时间后，原始位置（pitch=0，roll=0 时平坦的位置）不再平坦。它会倾斜到某个角度。我不知道原因。我认为将对象的位置重置为原始位置会起作用。
我该如何实现我的目标？
如果您想要重新创建完整代码，这是我的完整代码：
项目文件
英文:
I am trying to rotate an object which was imported as .obj file according to pitch and roll values.
I actually achieved this with this code
object.rotateX(ConvertToRadians(pitch));
object.rotate(ConvertToRadians(roll), 0, 0, 1); // This line is basically the same thing with rotateZ function. I used it because rotateZ gives a weird error.
However, when new pitch and roll values arrive with the socket connection and I use these lines of code. It adds to the previous rotation. To give an example, when the object is rotated around X-axis for 30 degrees and I try to make it rotate to 10 degrees. It rotates it to 40 degrees.
I tried saving the previous rotation and undoing it before giving the new rotation with this line
pieta.rotateX(ConvertToRadians(pitch-prevpitch));
It seems to work partially but after some time the original position (pitch=0 and roll = 0 is not flat anymore. It tilts to some angle. I don't know the reason). I think resetting the object's position to the original will work.
How can I achieve my aim?
This is my full code if you want to recreate it
Project File
答案1
得分: 0
使用resetMatrix()函数在每一帧中设置一个全新的矩阵：
object.resetMatrix();
object.rotateX(ConvertToRadians(pitch));
英文:
Use resetMatrix() to setup a completely new matrix in every frame:
object.resetMatrix();
object.rotateX(ConvertToRadians(pitch));
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