柚子快报激活码778899分享：Unity点到线段的最短距离
抄的Unity的源码
HandleUtility.DistancePointLine 是UnityEditor代码，源码如下，这样就可以在Runtime中运行
注意性能开销！
///
/// 计算点到线段的最短距离
///
///
///
///
///
public static float DistancePointLine(Vector3 point, Vector3 lineStart, Vector3 lineEnd)
{
Vector3 rhs = point - lineStart;
Vector3 vector3 = lineEnd - lineStart;
float magnitude = vector3.magnitude;
Vector3 lhs = vector3;
if ((double) magnitude > 9.99999997475243E-07)
lhs /= magnitude;
float num = Mathf.Clamp(Vector3.Dot(lhs, rhs), 0.0f, magnitude);
Vector3 v3 = lineStart + lhs * num;
return Vector3.Magnitude (v3 - point);
}
向量计算法：
AB为向量，求C到AB的距离，计算向量AC在向量AB上投影得到AD，可计算DC的长度
性能没问题
float GetPointToLineDistance(Vector3 point, Vector3 start, Vector3 end) {
Vector3 sp = point - start;
Vector3 se = end - start;
Vector3 project = Vector3.Project (sp, se);
Vector3 line = sp - project;
return line.magnitude;
}
俯视角二维
private float GetPointToPlaneDistance(Vector3 point, Vector3 start, Vector3 end) {
point = new Vector3 (point.x, 0, point.z);
start = new Vector3 (start.x, 0, start.z);
end = new Vector3 (end.x, 0, end.z);
Vector3 sp = point - start;
Vector3 se = end - start;
Vector3 project = Vector3.Project (sp, se);
Vector3 line = sp - project;
return line.magnitude;
}
胶囊体计算法：
上面的方法计算量较大，这种是实际项目中用的一种
柚子快报激活码778899分享：Unity点到线段的最短距离
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