方案1
/// <summary>
/// Returns a transform interpolated between this transform and another
/// <paramref name="transform"/> by a given <paramref name="weight"/>
/// (on the range of 0.0 to 1.0).
/// </summary>
/// <param name="transform">The other transform.</param>
/// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
/// <returns>The interpolated transform.</returns>
public readonly Transform3D InterpolateWith(Transform3D transform, real_t weight)
{
Vector3 sourceScale = Basis.Scale;
Quaternion sourceRotation = Basis.GetRotationQuaternion();
Vector3 sourceLocation = Origin;
Vector3 destinationScale = transform.Basis.Scale;
Quaternion destinationRotation = transform.Basis.GetRotationQuaternion();
Vector3 destinationLocation = transform.Origin;
var interpolated = new Transform3D();
Quaternion quaternion = sourceRotation.Slerp(destinationRotation, weight).Normalized();
Vector3 scale = sourceScale.Lerp(destinationScale, weight);
interpolated.Basis.SetQuaternionScale(quaternion, scale);
interpolated.Origin = sourceLocation.Lerp(destinationLocation, weight);
return interpolated;
}
方案2 欧拉角的方案（直线，不是球面） ，不使用 Lerp 函数
public static class AngleExtensions
{
public static Vector3 Clamp360(Vector3 eulerAngles)
{
return new Vector3(gTweens.Source.Extensions.AngleExtensions.Clamp360(eulerAngles.X), gTweens.Source.Extensions.AngleExtensions.Clamp360(eulerAngles.Y), gTweens.Source.Extensions.AngleExtensions.Clamp360(eulerAngles.Z));
}
public static Vector3 DeltaAngle(Vector3 current, Vector3 target)
{
return new Vector3(gTweens.Source.Extensions.AngleExtensions.DeltaAngle(current.X, target.X),gTweens.Source.Extensions.AngleExtensions.DeltaAngle(current.Y, target.Y), gTweens.Source.Extensions.AngleExtensions.DeltaAngle(current.Z, target.Z));
}
public static Vector3 GetDestinationAngleDegrees(Vector3 origin, Vector3 destination, RotationMode mode)
{
switch (mode)
{
case RotationMode.ShortestDistance:
{
Vector3 current = Clamp360(origin);
Vector3 target = Clamp360(destination);
Vector3 vector = DeltaAngle(current, target);
return origin + vector;
}
default:
return destination;
}
}
public static Vector3 GetDestinationAngleRadiants(Vector3 origin, Vector3 destination, RotationMode mode)
{
return GetDestinationAngleDegrees(origin * 57.29578f, destination * 57.29578f, mode) * 0.01745329f;
}
}
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