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//
// This codes is licensed under CC0 1.0.
// https://creativecommons.org/publicdomain/zero/1.0/
//
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
#if UNITY_EDITOR
using UnityEditor;
using MathNet.Numerics;
namespace Im {
class ReductionCurve {
public enum CurveType {
Discrete,
Linear,
Smooth,
Degree,
Radian,
}
private CurveType curveType;
public AnimationCurve curve;
private int order;
private double threshold;
private bool first;
private float lastValue;
private double queueHeadTime;
private double queueHeadValue;
private Stack<double> queueTimes;
private Stack<double> queueValues;
private bool hasLastKeyframe;
private Keyframe lastKeyframe;
public ReductionCurve(double threshold, CurveType curveType = CurveType.Smooth) {
this.threshold = threshold;
this.curveType = curveType;
if(curveType == CurveType.Discrete) {
order = 0;
} else if(curveType == CurveType.Linear) {
order = 1;
} else {
order = 3;
}
curve = new AnimationCurve();
first = true;
queueHeadTime = 0;
queueHeadValue = 0;
queueTimes = new Stack<double>();
queueValues = new Stack<double>();
hasLastKeyframe = false;
lastKeyframe = new Keyframe(0, 0);
}
public List<float> timeQueue = new List<float>();
private float PickValue(float c) {
if(first) {
first = false;
lastValue = c;
}
if(curveType == CurveType.Degree) {
c -= lastValue;
c = (((c + 180) % 360 + 360) % 360) - 180;
c += lastValue;
lastValue = c;
}
return c;
}
public void Tick(float t, float value) {
float v = PickValue(value);
if(queueTimes.Count == 0) {
queueHeadTime = t;
queueHeadValue = v;
}
queueTimes.Push(t - queueHeadTime);
queueValues.Push(v - queueHeadValue);
if(queueTimes.Count <= order + 1) {
return;
}
double[] ts = queueTimes.ToArray();
double[] vs = queueValues.ToArray();
double[] coeffs = Fit.Polynomial(ts, vs, order);
double res = 0;
for(int i=0;i<queueTimes.Count;i++) {
double ev = Polynomial.Evaluate(ts[i], coeffs);
double d = vs[i] - ev;
res += d * d;
}
if(res > threshold) {
Flush(false);
}
}
public void Done() {
Flush(true);
}
private Keyframe CreateKeyframe(double t, double[] coeffs) {
double t0 = queueHeadTime;
double t1 = queueHeadTime + t;
double p0 = queueHeadValue + coeffs[0];
double p1 = p0;
for(int j=1;j<=order;j++) {
p1 += coeffs[j] * Math.Pow(t, j);
}
double v0 = 0;
double v1 = 0;
if(order == 1) {
v0 = v1 = coeffs[1];
} else if(order == 3) {
v0 = coeffs[1];
v1 = coeffs[1] + 2 * coeffs[2] * t + 3 * coeffs[3] * t * t;
}
if(!hasLastKeyframe) {
hasLastKeyframe = true;
lastKeyframe = new Keyframe((float) t0, (float) p0, 0, 0);
}
lastKeyframe.outTangent = (float) v0;
Keyframe keyframe = new Keyframe((float) t1, (float) p1, (float) v1, 0);
return keyframe;
}
private void Flush(bool final) {
if(queueTimes.Count == 0) return;
double qht = 0;
double qhv = 0;
Stack<double> qt = new Stack<double>();
Stack<double> qv = new Stack<double>();
if(!final) {
if(order == 3) {
double t1 = queueTimes.Pop();
double t0 = queueTimes.Pop();
qht = queueHeadTime + t0;
qt.Push(0);
qt.Push(t1 - t0);
double v1 = queueValues.Pop();
double v0 = queueValues.Pop();
qhv = queueHeadValue + v0;
qv.Push(0);
qv.Push(v1 - v0);
queueTimes.Push(t0);
queueValues.Push(v0);
} else {
double t0 = queueTimes.Pop();
qht = queueHeadTime + t0;
qt.Push(0);
double v0 = queueValues.Pop();
qhv = queueHeadValue + v0;
qv.Push(0);
}
}
double[] ts = queueTimes.ToArray();
double[] vs = queueValues.ToArray();
double[] coeffs;
if(ts.Length >= order + 1) {
coeffs = Fit.Polynomial(ts, vs, order);
} else {
double[] cs = Fit.Polynomial(ts, vs, ts.Length - 1);
coeffs = new double[order+1];
cs.CopyTo(coeffs, 0);
}
Keyframe keyframe = CreateKeyframe(ts[0], coeffs);
int res = curve.AddKey(lastKeyframe);
if(res == -1) {
Debug.LogError("Failed to add keyframe");
}
if(final || order != 3) {
curve.AddKey(keyframe);
hasLastKeyframe = false;
} else {
lastKeyframe = keyframe;
}
queueHeadTime = qht;
queueHeadValue = qhv;
queueTimes = qt;
queueValues = qv;
}
}
public class KeyframeReduction : EditorWindow
{
private AnimationClip clip;
private AnimationClip outputClip;
private double threshold = 0.000001;
private float dt = 1 / 60.0f;
private bool bruteForce = true;
[MenuItem("Window/Im/Keyframe Reduction")]
public static void ShowWindow() {
GetWindow(typeof(KeyframeReduction));
}
private void OnGUI() {
GUILayout.Label("Keyframe Reduction", EditorStyles.boldLabel);
clip = EditorGUILayout.ObjectField("Animation Clip", clip, typeof(AnimationClip), false) as AnimationClip;
threshold = EditorGUILayout.DoubleField(new GUIContent("Threshold", "error tolerance threshold"), threshold);
dt = EditorGUILayout.FloatField(new GUIContent("Delta Time [s]", "time interval for 1 frame"), dt);
bruteForce = EditorGUILayout.Toggle(new GUIContent("Brute Force Mode", "If enabled, ALL FRAMES will be evaluated. High quality but long processing time."), bruteForce);
EditorGUILayout.Space(10);
outputClip = EditorGUILayout.ObjectField("Output Clip", outputClip, typeof(AnimationClip), false) as AnimationClip;
if(GUILayout.Button("Execute")) {
Run();
}
}
private void Run() {
var task = new KeyframeReductionTask(clip, outputClip, threshold, dt, bruteForce);
task.Run();
}
}
public class KeyframeReductionTask
{
private readonly AnimationClip clip;
private readonly AnimationClip outputClip;
private readonly double threshold;
private readonly float dt;
private readonly bool bruteForce;
private bool cancel = false;
private int progressId;
private int curveCount = 0;
private int doneCurveCount = 0;
private int reductionLoops = 0;
private int doneReductionLoops = 0;
public KeyframeReductionTask(AnimationClip clip, AnimationClip outputClip, double threshold, float dt, bool bruteForce) {
this.clip = clip;
this.outputClip = outputClip;
this.threshold = threshold;
this.dt = dt;
this.bruteForce = bruteForce;
}
public async void Run() {
if(clip == null) return;
progressId = Progress.Start("Keyframe Reduction");
Progress.RegisterCancelCallback(progressId, () => {
cancel = true;
return true;
});
AnimationClip ac = new AnimationClip();
EditorCurveBinding[] allBindings = AnimationUtility.GetCurveBindings(clip);
AnimationCurve[] curves = allBindings.Select(b => AnimationUtility.GetEditorCurve(clip, b)).ToArray();
AnimationCurve[] reducedCurves = new AnimationCurve[allBindings.Length];
curveCount = allBindings.Length;
foreach(var c in curves) {
if(!bruteForce) {
reductionLoops += c.keys.Length;
} else {
float endTime = c.keys[c.keys.Length-1].time;
// This value may differ slightly from the actual number of reduction loops
// due to floating point errors.
reductionLoops += Mathf.CeilToInt(endTime / dt);
}
}
await Task.Run(() => {
Parallel.For(0, allBindings.Length, i => {
EditorCurveBinding binding = allBindings[i];
AnimationCurve curve = curves[i];
ReductionCurve.CurveType type = ReductionCurve.CurveType.Smooth;
if(binding.propertyName == "m_IsActive") type = ReductionCurve.CurveType.Discrete;
if(binding.propertyName.Contains("Rotation")) type = ReductionCurve.CurveType.Radian;
// Note: Add any binding type you want here, or send me a PR!
reducedCurves[i] = ExecuteReduction(curve, type);
Interlocked.Increment(ref doneCurveCount);
UpdateProgress();
});
});
if(cancel) return;
for(int i=0;i<allBindings.Length;i++) {
EditorCurveBinding binding = allBindings[i];
AnimationCurve reduced = reducedCurves[i];
ac.SetCurve(binding.path, binding.type, binding.propertyName, reduced);
}
var settings = AnimationUtility.GetAnimationClipSettings(clip);
AnimationUtility.SetAnimationClipSettings(ac, settings);
if(outputClip == null) {
string path = AssetDatabase.GetAssetPath(clip);
string newPath = $"{Path.GetDirectoryName(path)}/{Path.GetFileNameWithoutExtension(path)}_reduced.anim";
Write(newPath, ac, true);
} else {
string path = AssetDatabase.GetAssetPath(outputClip);
Write(path, ac, false);
}
Progress.Finish(progressId, Progress.Status.Succeeded);
}
private AnimationCurve ExecuteReduction(AnimationCurve c, ReductionCurve.CurveType t) {
ReductionCurve k = new ReductionCurve(threshold, t);
if(!bruteForce) {
float lastTime = 0;
for(int i=0;i<c.keys.Length;i++) {
Keyframe key = c.keys[i];
float tp2 = key.time - dt * 2;
if(lastTime < tp2) k.Tick(tp2, c.Evaluate(tp2));
float tp = key.time - dt;
if(lastTime < tp) k.Tick(tp, c.Evaluate(tp));
k.Tick(key.time, key.value);
if(i != c.keys.Length-1) {
float tf = key.time + dt;
k.Tick(tf, c.Evaluate(tf));
lastTime = tf;
}
Interlocked.Increment(ref doneReductionLoops);
UpdateProgress();
if(cancel) {
break;
}
}
} else {
float endTime = c.keys[c.keys.Length-1].time;
float lt = 0.0f;
while(lt < endTime) {
k.Tick(lt, c.Evaluate(lt));
lt += dt;
Interlocked.Increment(ref doneReductionLoops);
UpdateProgress();
if(cancel) {
break;
}
}
float eps = 0.0001f;
if(lt + eps < endTime) k.Tick(endTime, c.Evaluate(endTime));
}
k.Done();
return k.curve;
}
private void UpdateProgress() {
string label = $"{doneCurveCount}/{curveCount}";
Progress.Report(progressId, (float)doneReductionLoops / reductionLoops, label);
}
private void Write(string rawPath, AnimationClip clip, bool unique) {
string path = unique
? AssetDatabase.GenerateUniqueAssetPath(rawPath)
: rawPath;
OverwriteAsset(clip, path);
AssetDatabase.SaveAssets();
AssetDatabase.Refresh();
}
private void OverwriteAsset(UnityEngine.Object asset, string path) {
if(File.Exists(path)) {
string tmpDirPath = Path.Combine(Path.GetDirectoryName(path), "tmpOverwrite");
Directory.CreateDirectory(tmpDirPath);
string tmpPath = Path.Combine(tmpDirPath, Path.GetFileName(path));
AssetDatabase.CreateAsset(asset, tmpPath);
FileUtil.ReplaceFile(tmpPath, path);
AssetDatabase.DeleteAsset(tmpDirPath);
AssetDatabase.ImportAsset(path);
} else {
AssetDatabase.CreateAsset(asset, path);
}
}
}
}
#endif
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