Unity 动画文件过渡帧的处理
原因
技能镜头是直接在 3ds Max 里面跟动作一起设计的，导出到 Unity 直接进行播放。然而因为导出的动画是连续的，在中间的镜头切换时，会产生过渡帧，影响表现。
解决
因为 FBX 动画是只读，无法进行编辑，所以需要拷贝一份动画文件，再对这份动画文件进行编辑。
另外，对于动画的旋转插值来说，切镜头肯定会出现大于 180 度的情况，所以要将插值改成欧拉角插值方式。
代码地址：
https://github.com/akof1314/AnimationPath/blob/master/AnimationPath/Assets/TangentToConstant/Editor/AnimationKeyframeTangentToConstantWindow.cs
using System;
using System.Collections.Generic;
using System.IO;
using UnityEditor;
using UnityEngine;
public class AnimationKeyframeTangentToConstantWindow : EditorWindow
{
public static Action onClipCopyModify;
//[MenuItem("Tool/动画瞬帧工具")]
public static void Init()
{
EditorWindow editorWindow = GetWindow(true, "动画瞬切帧工具");
editorWindow.minSize = new Vector2(160f, 30f);
editorWindow.maxSize = new Vector2(editorWindow.minSize.x, editorWindow.minSize.y);
}
private void OnGUI()
{
EditorGUILayout.BeginHorizontal();
if (GUILayout.Button("瞬切", "LargeButton", GUILayout.Width(150f)))
{
DoKeyframeTangentToConstant();
}
EditorGUILayout.EndHorizontal();
}
private void DoKeyframeTangentToConstant()
{
AnimationWindowReflect animationWindowReflect = AnimationWindowUtil.GetAnimationWindowReflect();
if (!animationWindowReflect.firstAnimationWindow)
{
SimpleDisplayDialog("Animation 窗口没有打开");
return;
}
AnimationClip activeAnimationClip = animationWindowReflect.activeAnimationClip;
if (activeAnimationClip == null)
{
SimpleDisplayDialog("Animation 窗口没有任何动画片段");
return;
}
float currentTime = animationWindowReflect.currentTime;
if ((activeAnimationClip.hideFlags & HideFlags.NotEditable) != HideFlags.None)
{
// FBX 动画则自动执行拷贝
AnimationClip oldClip = activeAnimationClip;
activeAnimationClip = CopyAnimationClipAsset(activeAnimationClip);
animationWindowReflect.activeAnimationClip = activeAnimationClip;
animationWindowReflect.currentTime = currentTime;
if (onClipCopyModify != null)
{
onClipCopyModify(oldClip, activeAnimationClip);
}
}
KeyframeTangentToConstant(activeAnimationClip, currentTime);
animationWindowReflect.firstAnimationWindow.Repaint();
SimpleDisplayDialog("瞬切完成");
}
private static void SimpleDisplayDialog(string text)
{
EditorUtility.DisplayDialog("提示", text, "确定");
}
///
/// 参照 ProjectWindowUtil.DuplicateSelectedAssets
///
///
///
/// 参照 RotationCurveInterpolation.SetInterpolation
///
///
private static void SetInterpolation(AnimationClip clip, EditorCurveBinding[] curveBindings, Mode newInterpolationMode)
{
List list1 = new List();
List list2 = new List();
List list3 = new List();
foreach (var curveBinding in curveBindings)
{
EditorCurveBinding editorCurveBinding = RemapAnimationBindingForRotationCurves(curveBinding, clip);
switch (GetModeFromCurveData(editorCurveBinding))
{
case Mode.Undefined:
break;
case Mode.RawQuaternions:
break;
default:
AnimationCurve editorCurve = AnimationUtility.GetEditorCurve(clip, editorCurveBinding);
if (editorCurve != null)
{
string propertyName = editorCurveBinding.propertyName;
string str = GetPrefixForInterpolation(newInterpolationMode) + '.' + propertyName[propertyName.Length - 1];
list1.Add(new EditorCurveBinding()
{
propertyName = str,
type = editorCurveBinding.type,
path = editorCurveBinding.path
});
list2.Add(editorCurve);
list3.Add(new EditorCurveBinding()
{
propertyName = editorCurveBinding.propertyName,
type = editorCurveBinding.type,
path = editorCurveBinding.path
});
}
break;
}
}
foreach (EditorCurveBinding binding in list3)
AnimationUtility.SetEditorCurve(clip, binding, null);
foreach (EditorCurveBinding binding in list1)
AnimationUtility.SetEditorCurve(clip, binding, list2[list1.IndexOf(binding)]);
}
}