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效果#xff1a;
主要用于在编辑器中可视化对象的朝向#xff0c;同时提供了选择不同轴向的功能。在运行时#xff0c;物体将根据所选择的轴向朝向目标#xff0c;并在 Scene 视图中绘制一个带箭头的圆环。
定义轴向枚举#xff1a;…Unity 使用任意一个局部轴指向目标
效果
主要用于在编辑器中可视化对象的朝向同时提供了选择不同轴向的功能。在运行时物体将根据所选择的轴向朝向目标并在 Scene 视图中绘制一个带箭头的圆环。
定义轴向枚举
public enum OnlyAxis
{x_Axis,y_Axis,z_Axis
}这是一个用于表示轴向的枚举包括 x 轴、y 轴和 z 轴。
定义变量
public Transform target; // 要指向的目标物体
[Header(追踪轴向)]
public OnlyAxis Axis OnlyAxis.x_Axis; // 选择旋转的轴向
private OnlyAxis CurrentAxis OnlyAxis.x_Axis; // 当前轴向target: 用于指定需要朝向的目标物体。Axis: 用于在 Inspector 窗口中选择旋转的轴向。CurrentAxis: 用于在运行时跟踪当前的轴向。
主要计算
private void Update()
{SetAxis(Axis);// 获取目标方向Vector3 targetDirection target.position - transform.position;Vector3 RotateAxis transform.up;// 根据选择的轴向获取目标方向在对应轴上的投影Vector3 axisDirection Vector3.zero;switch (CurrentAxis){case OnlyAxis.x_Axis:axisDirection Vector3.ProjectOnPlane(targetDirection, transform.right);break;case OnlyAxis.y_Axis:axisDirection Vector3.ProjectOnPlane(targetDirection, transform.up);break;case OnlyAxis.z_Axis:axisDirection transform.forward;Vector3 dirTemp transform.forward.normalized;RotateAxis Vector3.ProjectOnPlane(targetDirection, dirTemp);break;}// 计算旋转角度Quaternion newRotation Quaternion.LookRotation(axisDirection, RotateAxis);transform.rotation newRotation;
}
SetAxis 方法用于在运行时更新 CurrentAxis确保在不同的轴向之间正确切换。在 Update 方法中获取目标方向并根据当前选择的轴向计算相应的旋转。最后将物体的旋转设为新的旋转。
OnDrawGizmosSelected 方法仅在编辑器中生效
#if UNITY_EDITORprivate void OnDrawGizmosSelected(){DrawCircle();}public bool is3DDraw false;public float radius 0.1f;public float arrowLength 0.01f;int segments 20;private void DrawCircle(){float Radius is3DDraw ? radius : radius * Vector3.Distance(transform.position, SceneView.lastActiveSceneView.camera.transform.position);float ArrowLength is3DDraw ? arrowLength : arrowLength * Vector3.Distance(transform.position, SceneView.lastActiveSceneView.camera.transform.position);Gizmos.color Color.green;Vector3 center transform.position;Quaternion rotation transform.rotation;float angleIncrement 360f / segments;for (int i 0; i segments; i){float angle i * angleIncrement;Vector3 point Vector3.zero;float nextAngle (i 1) * angleIncrement;Vector3 nextPoint Vector3.zero;// 根据所选轴向调整旋转switch (Axis){case OnlyAxis.x_Axis:point center rotation * Quaternion.Euler(angle, 0, 0) * (Vector3.up * Radius);nextPoint center rotation * Quaternion.Euler(nextAngle, 0, 0) * (Vector3.up * Radius);if (i 0){Gizmos.DrawLine(nextPoint, center rotation * Quaternion.Euler(angle angleIncrement / 2, 0, 0) * (Vector3.up * (Radius ArrowLength)));Gizmos.DrawLine(nextPoint, center rotation * Quaternion.Euler(angle angleIncrement / 2, 0, 0) * (Vector3.up * (Radius - ArrowLength)));}break;case OnlyAxis.y_Axis:point center rotation * Quaternion.Euler(0, angle, 0) * (Vector3.right * Radius);nextPoint center rotation * Quaternion.Euler(0, nextAngle, 0) * (Vector3.right * Radius);if (i 0){Gizmos.DrawLine(nextPoint, center rotation * Quaternion.Euler(0, angle angleIncrement / 2, 0) * (Vector3.right * (Radius ArrowLength)));Gizmos.DrawLine(nextPoint, center rotation * Quaternion.Euler(0, angle angleIncrement / 2, 0) * (Vector3.right * (Radius -ArrowLength)));}break;case OnlyAxis.z_Axis:point center rotation * Quaternion.Euler(0, 0, angle) * (Vector3.right * Radius);nextPoint center rotation * Quaternion.Euler(0, 0, nextAngle) * (Vector3.right * Radius);if (i 0){Gizmos.DrawLine(nextPoint, center rotation * Quaternion.Euler(0, 0, angle angleIncrement / 2) * (Vector3.right * (Radius ArrowLength)));Gizmos.DrawLine(nextPoint, center rotation * Quaternion.Euler(0, 0, angle angleIncrement / 2) * (Vector3.right * (Radius -ArrowLength)));}break;}if (i ! 1) Gizmos.DrawLine(point, nextPoint);}}
#endifOnDrawGizmosSelected 方法用于在 Scene 视图中绘制圆环。DrawCircle 方法根据选择的轴向绘制一个圆环并在第一个点上画一个箭头。
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