private void RecalculateBorders()
{
Vector3 border = new Vector3(_borderSize, 0f, _borderSize);
_borderConfig = new BorderConfig();
_borderConfig.Size = _borderSize;
_borderConfig.WindSpeed = _borderWindSpeed;
_borderConfig.WindPow = _borderWindPow;
_borderConfig.BottomLeftInner = _borderBottomLeft + border;
_borderConfig.TopRightInner = _borderTopRight - border;
_borderConfig.SizeInverse = 1f / _borderSize; // Optimizes out the division
}
private static Vector3 GetBorderWindVelocity(BorderConfig border, Vector3 position)
{
// If position is near world borders, add wind that pushes back
//if (position.x < _borderBottomLeft.x + _borderSize) {
// windVelocity.x += (_borderSize - (position.x - _borderBottomLeft.x)) / _borderSize * _borderWindSpeed;
//}
// Below is an optimized version of the above, for all four borders
Vector3 windVelocity = new Vector3();
const float verticalScale = 0.5f;
if (position.x < border.BottomLeftInner.x)
{
float correction = (position.x - border.BottomLeftInner.x) * -border.SizeInverse;
correction = Mathf.Pow(correction, border.WindPow) * border.WindSpeed;
windVelocity.x += correction;
windVelocity.y += Mathf.Abs(correction) * verticalScale;
}
if (position.z < border.BottomLeftInner.z)
{
float correction = (position.z - border.BottomLeftInner.z) * -border.SizeInverse;
correction = Mathf.Pow(correction, border.WindPow) * border.WindSpeed;
windVelocity.z += correction;
windVelocity.y += Mathf.Abs(correction) * verticalScale;
}
if (position.x > border.TopRightInner.x)
{
float correction = ((position.x - border.TopRightInner.x)) * border.SizeInverse;
correction = Mathf.Pow(correction, border.WindPow) * border.WindSpeed;
windVelocity.x -= correction;
windVelocity.y += Mathf.Abs(correction) * verticalScale;
}
if (position.z > border.TopRightInner.z)
{
float correction = ((position.z - border.TopRightInner.z)) * border.SizeInverse;
correction = Mathf.Pow(correction, border.WindPow) * border.WindSpeed;
windVelocity.z -= correction;
windVelocity.y += Mathf.Abs(correction) * verticalScale;
}
return(windVelocity);
}