mirror of
https://github.com/vrm-c/UniVRM.git
synced 2026-05-11 04:54:17 -05:00
331 lines
14 KiB
C#
331 lines
14 KiB
C#
using System;
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using System.Linq;
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using System.Collections.Generic;
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using UnityEngine;
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namespace UniGLTF
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{
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public static class AnimationImporter
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{
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private enum TangentMode
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{
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Linear,
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Constant,
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Cubicspline
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}
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private static TangentMode GetTangentMode(string interpolation)
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{
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if (interpolation == glTFAnimationTarget.Interpolations.LINEAR.ToString())
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{
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return TangentMode.Linear;
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}
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else if (interpolation == glTFAnimationTarget.Interpolations.STEP.ToString())
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{
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return TangentMode.Constant;
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}
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else if (interpolation == glTFAnimationTarget.Interpolations.CUBICSPLINE.ToString())
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{
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return TangentMode.Cubicspline;
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}
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else
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{
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throw new NotImplementedException();
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}
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}
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private static void CalculateTanget(List<Keyframe> keyframes, int current)
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{
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int back = current - 1;
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if (back < 0)
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{
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return;
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}
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if (current < keyframes.Count)
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{
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var rightTangent = (keyframes[current].value - keyframes[back].value) / (keyframes[current].time - keyframes[back].time);
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keyframes[back] = new Keyframe(keyframes[back].time, keyframes[back].value, keyframes[back].inTangent, rightTangent);
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var leftTangent = (keyframes[back].value - keyframes[current].value) / (keyframes[back].time - keyframes[current].time);
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keyframes[current] = new Keyframe(keyframes[current].time, keyframes[current].value, leftTangent, 0);
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}
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}
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public static Quaternion GetShortest(Quaternion last, Quaternion rot)
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{
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if (Quaternion.Dot(last, rot) > 0.0)
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{
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return rot;
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}
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else
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{
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return new Quaternion(-rot.x, -rot.y, -rot.z, -rot.w);
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}
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}
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public delegate float[] ReverseZ(float[] current, float[] last);
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public static void SetAnimationCurve(
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AnimationClip targetClip,
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string relativePath,
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string[] propertyNames,
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float[] input,
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float[] output,
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string interpolation,
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Type curveType,
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ReverseZ reverse)
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{
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var tangentMode = GetTangentMode(interpolation);
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var curveCount = propertyNames.Length;
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AnimationCurve[] curves = new AnimationCurve[curveCount];
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List<Keyframe>[] keyframes = new List<Keyframe>[curveCount];
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int elementNum = curveCount;
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int inputIndex = 0;
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//Quaternion用
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float[] last = new float[curveCount];
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if (last.Length == 4)
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{
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last[3] = 1.0f;
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}
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for (inputIndex = 0; inputIndex < input.Length; ++inputIndex)
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{
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var time = input[inputIndex];
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var outputIndex = 0;
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if (tangentMode == TangentMode.Cubicspline)
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{
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outputIndex = inputIndex * elementNum * 3;
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var value = new float[curveCount];
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for (int i = 0; i < value.Length; i++)
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{
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value[i] = output[outputIndex + elementNum + i];
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}
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var reversed = reverse(value, last);
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last = reversed;
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for (int i = 0; i < keyframes.Length; i++)
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{
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if (keyframes[i] == null)
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keyframes[i] = new List<Keyframe>();
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keyframes[i].Add(new Keyframe(
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time,
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reversed[i],
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output[outputIndex + i],
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output[outputIndex + i + elementNum * 2]));
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}
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}
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else
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{
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outputIndex = inputIndex * elementNum;
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var value = new float[curveCount];
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for (int i = 0; i < value.Length; i++)
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{
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value[i] = output[outputIndex + i];
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}
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var reversed = reverse(value, last);
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last = reversed;
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for (int i = 0; i < keyframes.Length; i++)
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{
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if (keyframes[i] == null)
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keyframes[i] = new List<Keyframe>();
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if (tangentMode == TangentMode.Linear)
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{
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keyframes[i].Add(new Keyframe(time, reversed[i], 0, 0));
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if (keyframes[i].Count > 0)
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{
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CalculateTanget(keyframes[i], keyframes[i].Count - 1);
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}
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}
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else if (tangentMode == TangentMode.Constant)
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keyframes[i].Add(new Keyframe(time, reversed[i], 0, float.PositiveInfinity));
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}
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}
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}
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for (int i = 0; i < curves.Length; i++)
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{
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curves[i] = new AnimationCurve();
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for (int j = 0; j < keyframes[i].Count; j++)
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{
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curves[i].AddKey(keyframes[i][j]);
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}
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targetClip.SetCurve(relativePath, curveType, propertyNames[i], curves[i]);
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}
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}
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public static List<AnimationClip> ImportAnimationClip(ImporterContext ctx)
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{
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List<AnimationClip> animasionClips = new List<AnimationClip>();
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for (int i = 0; i < ctx.GLTF.animations.Count; ++i)
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{
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var clip = new AnimationClip();
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clip.ClearCurves();
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clip.legacy = true;
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clip.name = ctx.GLTF.animations[i].name;
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if (string.IsNullOrEmpty(clip.name))
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{
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clip.name = "legacy_" + i;
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}
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clip.wrapMode = WrapMode.Loop;
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var animation = ctx.GLTF.animations[i];
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if (string.IsNullOrEmpty(animation.name))
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{
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animation.name = string.Format("animation:{0}", i);
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}
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foreach (var channel in animation.channels)
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{
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var targetTransform = ctx.Nodes[channel.target.node];
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var relativePath = targetTransform.RelativePathFrom(ctx.Root.transform);
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switch (channel.target.path)
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{
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case glTFAnimationTarget.PATH_TRANSLATION:
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{
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var sampler = animation.samplers[channel.sampler];
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var input = ctx.GLTF.GetArrayFromAccessor<float>(sampler.input);
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var output = ctx.GLTF.GetArrayFromAccessorAsFloat(sampler.output);
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AnimationImporter.SetAnimationCurve(
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clip,
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relativePath,
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new string[] { "localPosition.x", "localPosition.y", "localPosition.z" },
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input,
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output,
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sampler.interpolation,
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typeof(Transform),
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(values, last) =>
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{
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Vector3 temp = new Vector3(values[0], values[1], values[2]);
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return temp.ReverseZ().ToArray();
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}
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);
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}
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break;
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case glTFAnimationTarget.PATH_ROTATION:
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{
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var sampler = animation.samplers[channel.sampler];
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var input = ctx.GLTF.GetArrayFromAccessor<float>(sampler.input);
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var output = ctx.GLTF.GetArrayFromAccessorAsFloat(sampler.output);
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AnimationImporter.SetAnimationCurve(
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clip,
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relativePath,
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new string[] { "localRotation.x", "localRotation.y", "localRotation.z", "localRotation.w" },
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input,
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output,
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sampler.interpolation,
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typeof(Transform),
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(values, last) =>
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{
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Quaternion currentQuaternion = new Quaternion(values[0], values[1], values[2], values[3]);
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Quaternion lastQuaternion = new Quaternion(last[0], last[1], last[2], last[3]);
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return AnimationImporter.GetShortest(lastQuaternion, currentQuaternion.ReverseZ()).ToArray();
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}
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);
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clip.EnsureQuaternionContinuity();
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}
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break;
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case glTFAnimationTarget.PATH_SCALE:
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{
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var sampler = animation.samplers[channel.sampler];
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var input = ctx.GLTF.GetArrayFromAccessor<float>(sampler.input);
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var output = ctx.GLTF.GetArrayFromAccessorAsFloat(sampler.output);
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AnimationImporter.SetAnimationCurve(
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clip,
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relativePath,
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new string[] { "localScale.x", "localScale.y", "localScale.z" },
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input,
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output,
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sampler.interpolation,
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typeof(Transform),
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(values, last) => values);
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}
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break;
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case glTFAnimationTarget.PATH_WEIGHT:
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{
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var node = ctx.GLTF.nodes[channel.target.node];
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var mesh = ctx.GLTF.meshes[node.mesh];
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//var primitive = mesh.primitives.FirstOrDefault();
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//var targets = primitive.targets;
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List<string> blendShapeNames = new List<string>();
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var transform = ctx.Nodes[channel.target.node];
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var skinnedMeshRenderer = transform.GetComponent<SkinnedMeshRenderer>();
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if (skinnedMeshRenderer == null)
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{
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continue;
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}
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for (int j = 0; j < skinnedMeshRenderer.sharedMesh.blendShapeCount; j++)
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{
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blendShapeNames.Add(skinnedMeshRenderer.sharedMesh.GetBlendShapeName(j));
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}
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var keyNames = blendShapeNames
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.Where(x => !string.IsNullOrEmpty(x))
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.Select(x => "blendShape." + x)
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.ToArray();
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var sampler = animation.samplers[channel.sampler];
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var input = ctx.GLTF.GetArrayFromAccessor<float>(sampler.input);
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var output = ctx.GLTF.GetArrayFromAccessor<float>(sampler.output);
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AnimationImporter.SetAnimationCurve(
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clip,
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relativePath,
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keyNames,
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input,
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output,
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sampler.interpolation,
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typeof(SkinnedMeshRenderer),
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(values, last) =>
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{
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for (int j = 0; j < values.Length; j++)
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{
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values[j] *= 100.0f;
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}
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return values;
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});
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}
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break;
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default:
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Debug.LogWarningFormat("unknown path: {0}", channel.target.path);
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break;
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}
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}
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animasionClips.Add(clip);
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}
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return animasionClips;
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}
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public static void ImportAnimation(ImporterContext ctx)
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{
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// animation
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if (ctx.GLTF.animations != null && ctx.GLTF.animations.Any())
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{
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var animation = ctx.Root.AddComponent<Animation>();
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ctx.AnimationClips = ImportAnimationClip(ctx);
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foreach (var clip in ctx.AnimationClips)
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{
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animation.AddClip(clip, clip.name);
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}
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if (ctx.AnimationClips.Count > 0)
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{
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animation.clip = ctx.AnimationClips.First();
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}
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}
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}
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}
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}
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