/// <summary>
/// 根据重力更新摄像机变换参考系
/// </summary>
void UpdateGravityAlignment()
{
// 1. 计算当前相机在当前重力下的旋转
Vector3 fromUp = m_gravityAlignment * Vector3.up; // 由当前重力纵轴确定
Vector3 toUp = CustomGravity.GetUpAxis(m_focusPoint); // 由注视点的重力确定
// 2. 得到旋转的角度值
float dot = Mathf.Clamp(Vector3.Dot(fromUp, toUp), -1f, 1f); // 精度问题可能会超出有效范围，造成非预期后果所以clamp之
float angle = Mathf.Acos(dot) * Mathf.Rad2Deg;
// 3. 计算当前帧最大旋转速度
float maxAngle = m_upAlignmentSpeed * Time.deltaTime;
// 4。由两个纵轴插值和起始旋转求得目标旋转
Quaternion newAlignment = Quaternion.FromToRotation(fromUp, toUp) * m_gravityAlignment;
// 5. 如果所需旋转角不大于旋转速度，则不进行旋转
if (angle <= maxAngle)
{
m_gravityAlignment = newAlignment;
}
// 6. 如果所需旋转角大于旋转速度，则进行旋转
else
{
m_gravityAlignment = Quaternion.SlerpUnclamped(m_gravityAlignment, newAlignment, maxAngle / angle); // 由于插值比例保证合理，所以“Unclamped”
}
}
void UpdateGravityAlignment()
{
Vector3 fromUp = gravityAlignment * Vector3.up;
Vector3 toUp = CustomGravity.GetUpAxis(focusPoint);
float dot = Mathf.Clamp(Vector3.Dot(fromUp, toUp), -1f, 1f);
float angle = Mathf.Acos(dot) * Mathf.Rad2Deg;
float maxAngle = upAlignmentSpeed * Time.deltaTime;
Quaternion newAlignment = Quaternion.FromToRotation(fromUp, toUp) * gravityAlignment;
if (angle <= maxAngle)
{
gravityAlignment = newAlignment;
}
else
{
gravityAlignment = Quaternion.SlerpUnclamped(gravityAlignment, newAlignment, maxAngle / angle);
}
}
void LateUpdate()
{
gravityAlignment =
Quaternion.FromToRotation(
gravityAlignment * Vector3.up,
CustomGravity.GetUpAxis(focusPoint)
) * gravityAlignment;
UpdateFocusPoint();
if (ManualRotation() || AutomaticRotation())
{
ConstrainAngles();
orbitRotation = Quaternion.Euler(orbitAngles);
}
Quaternion lookRotation = gravityAlignment * orbitRotation;
Vector3 lookDirection = lookRotation * Vector3.forward;
Vector3 lookPosition = focusPoint - lookDirection * distance;
Vector3 rectOffset = lookDirection * regularCamera.nearClipPlane;
Vector3 rectPosition = lookPosition + rectOffset;
Vector3 castFrom = focus.position;
Vector3 castLine = rectPosition - castFrom;
float castDistance = castLine.magnitude;
Vector3 castDirection = castLine / castDistance;
if (Physics.BoxCast(
castFrom, CameraHalfExtends, castDirection, out RaycastHit hit,
lookRotation, castDistance, obstructionMask
))
{
rectPosition = castFrom + castDirection * hit.distance;
lookPosition = rectPosition - rectOffset;
}
transform.SetPositionAndRotation(lookPosition, lookRotation);
}
private void LateUpdate()
{
////5.1.4 自定义重力下对齐轨道摄像机
//gravityAlignment = Quaternion.FromToRotation(gravityAlignment * Vector3.up, -Physics.gravity.normalized) * gravityAlignment;
//5.2.2 应用自定义重力
gravityAlignment = Quaternion.FromToRotation(gravityAlignment * Vector3.up, CustomGravity.GetUpAxis(focusPoint)) * gravityAlignment;
////2.2 控制轨道
////Vector3 focusPoint = focus.position;
//UpdateFocusPoint();
//ManualRotation();
//Quaternion lookRotation = Quaternion.Euler(orbitAngles);
////Vector3 lookDirection = transform.forward;
//Vector3 lookDirection = lookRotation * Vector3.forward;
////transform.localPosition = focusPoint - lookDirection * distance;
//Vector3 lookPosition = focusPoint - lookDirection * distance;
//transform.SetPositionAndRotation(lookPosition, lookRotation);
//2.3 约束角度
UpdateFocusPoint();
//Quaternion lookRotation;
if (ManualRotation() || AutomaticRotation())
{
ConstrainAngles();
orbitRotation = Quaternion.Euler(orbitAngles);
}
//else
//{
// lookRotation = transform.localRotation;
//}
Quaternion lookRotation = gravityAlignment * orbitRotation;
Vector3 lookDirection = lookRotation * Vector3.forward;
Vector3 lookPosition = focusPoint - lookDirection * distance;
////4.1减少外观距离
//if (Physics.Raycast(focusPoint, -lookDirection, out RaycastHit hit, distance))
//{
// lookPosition = focusPoint - lookDirection * hit.distance;
//}
////4.2保持近平面清晰 采用盒子投射
//if (Physics.BoxCast(focusPoint, CameraHalfExtends, -lookDirection, out RaycastHit hit, lookRotation, distance - regularCamera.nearClipPlane))
//{
// lookPosition = focusPoint - lookDirection * (hit.distance + regularCamera.nearClipPlane);
//}
//4.3聚焦半径
Vector3 rectOffset = lookDirection * regularCamera.nearClipPlane;
Vector3 rectPosition = lookPosition + rectOffset;
Vector3 castFrom = focus.position;
Vector3 castLine = rectPosition - castFrom;
float castDistance = castLine.magnitude;
Vector3 castDirection = castLine / castDistance;
if (Physics.BoxCast(castFrom, CameraHalfExtends, castDirection, out RaycastHit hit, lookRotation, castDistance, obstructionMask))
{
//lookPosition = focusPoint - lookDirection * (hit.distance + regularCamera.nearClipPlane);
rectPosition = castFrom + castDirection * hit.distance;
lookPosition = rectPosition - rectOffset;
}
transform.SetPositionAndRotation(lookPosition, lookRotation);
}