AnimationClip

Description

Provides an asset that assigns animation curves to animatable properties.

The Animation component and the Animator component use the AnimationClip asset to animate GameObject and Component properties.

Supported Animatable Types

When you create an AnimationClip asset with an Animation component, you must set legacy to true. Use the Animation component to animate the following public or serialized properties for a GameObject or Component:

• float values
• boolean values (casted to float)
• integer values (casted to float)
• discrete integer values (using the attribute DiscreteEvaluationAttribute and reinterpreted to float)

For legacy clips, use the SetCurve method to assign new curves in the Editor and at runtime.

When you create an AnimationClip asset for an Animator component, you can animate the following public or serialized properties:

• float values
• boolean values (cast as float)
• integer values (cast as float)
• discrete integer values (use the DiscreteEvaluationAttribute attribute reinterpreted as a float)
• Object reference values (saved as an ObjectReferenceKeyframe)

Curve creation

In the Editor, it is recommended that you use the AnimationUtility.SetEditorCurve and AnimationUtility.SetEditorCurves methods to assign one or many AnimationCurve objects for each float property and each boolean, integer, or discrete integer reinterpreted as a float.

In the Editor and at runtime, you can use the SetCurve method to assign an AnimationCurve to an animation clip. You can also modify an animation clip at runtime but this modification is only recognized by the Animation component. The Animator component requires that clips are compiled to an optimized representation and this compilation process is not available at runtime.

Use the AnimationUtility.SetObjectReferenceCurve and AnimationUtility.SetObjectReferenceCurves methods to create and assign new ObjectReferenceKeyframe arrays of Object reference properties. Note: This is only supported by the Animator component.

Curve query

Use the AnimationUtility.GetEditorCurve method to retrieve an AnimationCurve for a float property.

Use the AnimationUtility.GetObjectReferenceCurve method to retrieve an ObjectReferenceKeyframe array for an Object reference property. Note: This is only supported by the Animator component.

Animation Events management

In the editor, use the AnimationUtility.SetAnimationEvents method to set or replace the AnimationEvent array for the AnimationClip. Use the AnimationUtility.GetAnimationEvents method to retrieve the AnimationEvent array from the AnimationClip.

Additional resources: Animation Animator AnimationCurve ObjectReferenceKeyframe AnimationEvent

// Create a new MonoBehaviour in your project and paste in the following code.

using UnityEngine;

// The example creates a new MonoBehaviour that is used alongside a Camera component.
// At runtime, the component will create a procedural clip to animate the Camera field of view
// property and automatically play that clip on an Animation component.
[RequireComponent(typeof(Camera))]
public class ProceduralFieldOfViewAnimation : MonoBehaviour
{
    void OnEnable()
    {
        AnimationClip clip = new AnimationClip();
        AnimationCurve curve = AnimationCurve.Linear(0.0f, 60.0f, 10.0f, 90.0f);
        clip.SetCurve("", typeof(Camera), "field of view", curve);
        clip.legacy = true;

        if (!TryGetComponent<Animation>(out var animation))
            animation = gameObject.AddComponent<Animation>();

        animation.AddClip(clip, "animfov");
        animation.Play("animfov");
    }
}

using UnityEditor;
using UnityEngine;

static class AnimationClipWithAnimationCurvesExample
{
    // This example creates an AnimationClip with a single frame that captures the pose of a GameObject hierarchy.
    // The clip is saved as an asset in the project.
    [MenuItem("Example/Create Animation Clip Pose From GameObject")]
    static void CreateAnimationClipPoseFromGameObject()
    {
        var selectedGameObject = Selection.activeGameObject;
        if (selectedGameObject == null)
        {
            Debug.LogError("Please select a GameObject to create a clip for.");
            return;
        }

        AnimationClip clip = new AnimationClip();

        var transforms = selectedGameObject.GetComponentsInChildren<Transform>();
        var numberOfCurves = transforms.Length * 10; // 3 for position, 4 for rotation, 3 for scale

        var bindings = new EditorCurveBinding[numberOfCurves];
        var curves = new AnimationCurve[numberOfCurves];

        for (int i = 0; i < transforms.Length; ++i)
        {
            var startIndex = i * 10;

            var transform = transforms[i];
            var path = AnimationUtility.CalculateTransformPath(transform, selectedGameObject.transform);

            var index = startIndex;
            bindings[index++] = EditorCurveBinding.FloatCurve(path, typeof(Transform), "m_LocalPosition.x");
            bindings[index++] = EditorCurveBinding.FloatCurve(path, typeof(Transform), "m_LocalPosition.y");
            bindings[index++] = EditorCurveBinding.FloatCurve(path, typeof(Transform), "m_LocalPosition.z");

            bindings[index++] = EditorCurveBinding.FloatCurve(path, typeof(Transform), "m_LocalRotation.x");
            bindings[index++] = EditorCurveBinding.FloatCurve(path, typeof(Transform), "m_LocalRotation.y");
            bindings[index++] = EditorCurveBinding.FloatCurve(path, typeof(Transform), "m_LocalRotation.z");
            bindings[index++] = EditorCurveBinding.FloatCurve(path, typeof(Transform), "m_LocalRotation.w");

            bindings[index++] = EditorCurveBinding.FloatCurve(path, typeof(Transform), "m_LocalScale.x");
            bindings[index++] = EditorCurveBinding.FloatCurve(path, typeof(Transform), "m_LocalScale.y");
            bindings[index] = EditorCurveBinding.FloatCurve(path, typeof(Transform), "m_LocalScale.z");

            transform.GetLocalPositionAndRotation(out var localPosition, out var localRotation);
            var localScale = transform.localScale;

            index = startIndex;
            curves[index++] = AnimationCurve.Constant(0f, 1f, localPosition.x);
            curves[index++] = AnimationCurve.Constant(0f, 1f, localPosition.y);
            curves[index++] = AnimationCurve.Constant(0f, 1f, localPosition.z);

            curves[index++] = AnimationCurve.Constant(0f, 1f, localRotation.x);
            curves[index++] = AnimationCurve.Constant(0f, 1f, localRotation.y);
            curves[index++] = AnimationCurve.Constant(0f, 1f, localRotation.z);
            curves[index++] = AnimationCurve.Constant(0f, 1f, localRotation.w);

            curves[index++] = AnimationCurve.Constant(0f, 1f, localScale.x);
            curves[index++] = AnimationCurve.Constant(0f, 1f, localScale.y);
            curves[index] = AnimationCurve.Constant(0f, 1f, localScale.z);
        }

        AnimationUtility.SetEditorCurves(clip, bindings, curves);

        AssetDatabase.CreateAsset(clip, AssetDatabase.GenerateUniqueAssetPath($"Assets/{selectedGameObject.name}-Pose.anim"));
    }
}

using UnityEditor;
using UnityEngine;

static class AnimationClipWithObjectReferenceKeyframesExample
{
    // This example creates an AnimationClip of a sequence of sprites selected
    // in the project view. The clip is saved as an asset in the project.
    [MenuItem("Example/Create Flip Book Animation Clip From Sprites")]
    static void CreateFlipBookAnimationClipFromSprites()
    {
        var selectedSprites = Selection.GetFiltered<Sprite>(SelectionMode.Unfiltered);
        if (selectedSprites == null || selectedSprites.Length == 0)
        {
            Debug.LogError("Please select sprites in the project view to create a clip for.");
            return;
        }

        AnimationClip clip = new AnimationClip();

        var spriteCurve = new ObjectReferenceKeyframe[selectedSprites.Length];
        for (int i = 0; i < selectedSprites.Length; ++i)
        {
            var sprite = selectedSprites[i];
            spriteCurve[i] = new ObjectReferenceKeyframe
            {
                time = i/clip.frameRate,
                value = sprite
            };
        }

        var spriteBinding = EditorCurveBinding.PPtrCurve("", typeof(SpriteRenderer), "m_Sprite");
        AnimationUtility.SetObjectReferenceCurve(clip, spriteBinding, spriteCurve);

        AssetDatabase.CreateAsset(clip, AssetDatabase.GenerateUniqueAssetPath($"Assets/FlipBookClip.anim"));
    }
}

Properties

Constructors

Public Methods

Inherited Members