如何将法线转换为度数？
我正在开发一个游戏，并且正在编写一个 Entity 基类。由于许多实体的行为类似于粒子（2D），我想使用法线而不是以度数为单位的旋转。然而，由于我使用的是 OpenGL，所以我需要有法线的角度来旋转。从法线转换为度数最快的方法是什么，反之亦然。我知道我可以使用三角函数，例如 atan2 sin cos 等，但我很确定有一种更快的方法。任何帮助或指导将不胜感激。
I am working on a game and I am writing an Entity base class. Since many of the entities will behave like particles(2D) I want to use a normal instead of a rotation in degrees. However since I am using OpenGL I need to have the degree of the normal to rotate. What is the fastest way to convert from the normal to degrees and vice versa. I know that I can use trigonometric functions such as atan2 sin cos etc, but I am pretty sure there is a faster method. Any help or direction would be appreciated.
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如果您受限于二维并且尝试将方向向量 (x, y) 转换为距 x 轴的度数，那么
atan2(y, x)几乎肯定会是你最快的方法，除非你将 x 和 y 的可能值限制在一些非常微不足道的情况下。当然，要获取 y 轴的度数，只需使用atan2(x, y)即可。该角度将以弧度为单位。乘以 180/pi 即可转换为度数。这应该需要很短的时间。您绘制的图形表明
atan2(x, y) * 180 / Math.PI将为您提供所需的结果。除非您已经分析了代码并确定此计算中存在瓶颈（这不太可能），否则不要担心速度。
If you're constrained to two dimensions and you're trying to convert a directional vector (x, y) to degrees from the x-axis, then
atan2(y, x)is almost definitely going to be your fastest method, unless you're constraining the possible values of x and y to some pretty trivial cases. To get the degrees from the y-axis, just useatan2(x, y), of course. This angle will be in radians. Multiply by 180/pi to convert to degrees. This should require a trivial amount of time.The figure you're drawing suggests that
atan2(x, y) * 180 / Math.PIwill give you the results you desire.Don't be concerned with speed unless you've profiled your code and have determined that there is a bottleneck in this calculation (which is unlikely).