How can I play an animation backwards?

unity_sTSyg76CUWdvKQ · Nov 26, 2022

Straafe said: ↑

If it helps anyone else, I modified the script above to be inside the context menu when you right click on an animation clip. It also automatically creates the copy and adds "_Reversed" to the name so you don't have to copy it first. Not perfect, but it saves me some time.

Code (CSharp):

using UnityEditor;

using UnityEngine;

using System.IO;

public static class ReverseAnimationContext

{

[MenuItem("Assets/Create Reversed Clip", false, 14)]

private static void ReverseClip()

{

string directoryPath = Path.GetDirectoryName(AssetDatabase.GetAssetPath(Selection.activeObject));

string fileName = Path.GetFileName(AssetDatabase.GetAssetPath(Selection.activeObject));

string fileExtension = Path.GetExtension(AssetDatabase.GetAssetPath(Selection.activeObject));

fileName = fileName.Split('.')[0];

string copiedFilePath = directoryPath + Path.DirectorySeparatorChar + fileName + "_Reversed" + fileExtension;

var clip = GetSelectedClip();

AssetDatabase.CopyAsset(AssetDatabase.GetAssetPath(Selection.activeObject), copiedFilePath);

clip = (AnimationClip)AssetDatabase.LoadAssetAtPath(copiedFilePath, typeof(AnimationClip));

if (clip == null)

return;

float clipLength = clip.length;

var curves = AnimationUtility.GetAllCurves(clip, true);

clip.ClearCurves();

foreach (AnimationClipCurveData curve in curves)

{

var keys = curve.curve.keys;

int keyCount = keys.Length;

var postWrapmode = curve.curve.postWrapMode;

curve.curve.postWrapMode = curve.curve.preWrapMode;

curve.curve.preWrapMode = postWrapmode;

for (int i = 0; i < keyCount; i++)

{

Keyframe K = keys[i];

K.time = clipLength - K.time;

var tmp = -K.inTangent;

K.inTangent = -K.outTangent;

K.outTangent = tmp;

keys[i] = K;

}

curve.curve.keys = keys;

clip.SetCurve(curve.path, curve.type, curve.propertyName, curve.curve);

}

var events = AnimationUtility.GetAnimationEvents(clip);

if (events.Length > 0)

{

for (int i = 0; i < events.Length; i++)

{

events[i].time = clipLength - events[i].time;

}

AnimationUtility.SetAnimationEvents(clip, events);

}

Debug.Log("Animation reversed!");

}

[MenuItem("Assets/Create Reversed Clip", true)]

static bool ReverseClipValidation()

{

return Selection.activeObject.GetType() == typeof(AnimationClip);

}

public static AnimationClip GetSelectedClip()

{

var clips = Selection.GetFiltered(typeof(AnimationClip), SelectionMode.Assets);

if (clips.Length > 0)

{

return clips[0] as AnimationClip;

}

return null;

}

}

Click to expand...

You are an absolute F***ing unit my friend; thank you so much!

Georgi022 · Nov 29, 2022

Ana_22 said: ↑

@Straafe
Click to expand...

Thank you so much for the awesome tool!

superlama · Apr 2, 2023

sylvin said: ↑

No need for a new script, Just copy and paste the Animation state that you want to reverse on the Animator Window, then rename it and set the speed ( -1 for reverse). After that, you just need to call the animation by the new name in animator
Click to expand...

Yeah, this is the solution. Thanks! (2021.3.10f1)

pet-kos · Jun 16, 2023

Why super-complicating stuff with long sausage code when you can literally make clone animation and change it's speed = -1?...or just access speed parameter.

Straafe said: ↑

If it helps anyone else, I modified the script above to be inside the context menu when you right click on an animation clip. It also automatically creates the copy and adds "_Reversed" to the name so you don't have to copy it first. Not perfect, but it saves me some time.

Code (CSharp):

using UnityEditor;

using UnityEngine;

using System.IO;

public static class ReverseAnimationContext

{

[MenuItem("Assets/Create Reversed Clip", false, 14)]

private static void ReverseClip()

{

string directoryPath = Path.GetDirectoryName(AssetDatabase.GetAssetPath(Selection.activeObject));

string fileName = Path.GetFileName(AssetDatabase.GetAssetPath(Selection.activeObject));

string fileExtension = Path.GetExtension(AssetDatabase.GetAssetPath(Selection.activeObject));

fileName = fileName.Split('.')[0];

string copiedFilePath = directoryPath + Path.DirectorySeparatorChar + fileName + "_Reversed" + fileExtension;

var clip = GetSelectedClip();

AssetDatabase.CopyAsset(AssetDatabase.GetAssetPath(Selection.activeObject), copiedFilePath);

clip = (AnimationClip)AssetDatabase.LoadAssetAtPath(copiedFilePath, typeof(AnimationClip));

if (clip == null)

return;

float clipLength = clip.length;

var curves = AnimationUtility.GetAllCurves(clip, true);

clip.ClearCurves();

foreach (AnimationClipCurveData curve in curves)

{

var keys = curve.curve.keys;

int keyCount = keys.Length;

var postWrapmode = curve.curve.postWrapMode;

curve.curve.postWrapMode = curve.curve.preWrapMode;

curve.curve.preWrapMode = postWrapmode;

for (int i = 0; i < keyCount; i++)

{

Keyframe K = keys[i];

K.time = clipLength - K.time;

var tmp = -K.inTangent;

K.inTangent = -K.outTangent;

K.outTangent = tmp;

keys[i] = K;

}

curve.curve.keys = keys;

clip.SetCurve(curve.path, curve.type, curve.propertyName, curve.curve);

}

var events = AnimationUtility.GetAnimationEvents(clip);

if (events.Length > 0)

{

for (int i = 0; i < events.Length; i++)

{

events[i].time = clipLength - events[i].time;

}

AnimationUtility.SetAnimationEvents(clip, events);

}

Debug.Log("Animation reversed!");

}

[MenuItem("Assets/Create Reversed Clip", true)]

static bool ReverseClipValidation()

{

return Selection.activeObject.GetType() == typeof(AnimationClip);

}

public static AnimationClip GetSelectedClip()

{

var clips = Selection.GetFiltered(typeof(AnimationClip), SelectionMode.Assets);

if (clips.Length > 0)

{

return clips[0] as AnimationClip;

}

return null;

}

}

Click to expand...

Straafe · Jun 16, 2023

You're responding to a several years-old thread. Also, to answer your question, one reason why you might still want two separate clips in that situation is so you can further modify either one independent of each other.

halley · Jun 16, 2023

pet-kos said: ↑

Why super-complicating stuff with long sausage code when you can literally make clone animation and change it's speed = -1?...or just access speed parameter.
Click to expand...

As @Straafe said, this is a necro-post, and it's in the Timeline forum area, and as Unity staff have said, Timeline cannot reverse animations. This isn't about a single Animator or AnimationClip.

I wish more people would read the thread before throwing out junk kneejerk duplicate offtopic replies.

Bender_R · Aug 9, 2023

Thanks for sharing!

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