private List <AnimationClip> ImportAnimationClips(glTF gltf, Axises invertAxis)
{
var animationClips = new List <AnimationClip>();
for (var i = 0; i < gltf.animations.Count; ++i)
{
var clip = new AnimationClip();
clip.ClearCurves();
clip.legacy = true;
clip.name = gltf.animations[i].name;
if (string.IsNullOrEmpty(clip.name))
{
clip.name = $"legacy_{i}";
}
clip.wrapMode = WrapMode.Loop;
var animation = gltf.animations[i];
if (string.IsNullOrEmpty(animation.name))
{
animation.name = $"animation:{i}";
}
AxisInverter inverter = default;
switch (invertAxis)
{
case Axises.X:
inverter = AxisInverter.ReverseX;
break;
case Axises.Z:
inverter = AxisInverter.ReverseZ;
break;
default:
throw new System.Exception();
}
animationClips.Add(AnimationImporterUtil.ConvertAnimationClip(gltf, animation, inverter));
}
return(animationClips);
}
public static void SetupSkinning(ImporterContext context, List <TransformWithSkin> nodes, int i, AxisInverter inverter)
{
var x = nodes[i];
var skinnedMeshRenderer = x.Transform.GetComponent <SkinnedMeshRenderer>();
if (skinnedMeshRenderer != null)
{
var mesh = skinnedMeshRenderer.sharedMesh;
if (x.SkinIndex.HasValue)
{
if (mesh == null)
{
throw new Exception();
}
if (skinnedMeshRenderer == null)
{
throw new Exception();
}
if (x.SkinIndex.Value < context.GLTF.skins.Count)
{
// calculate internal values(boundingBox etc...) when sharedMesh assigned ?
skinnedMeshRenderer.sharedMesh = null;
var skin = context.GLTF.skins[x.SkinIndex.Value];
var joints = skin.joints.Select(y => nodes[y].Transform).ToArray();
if (joints.Any())
{
// have bones
skinnedMeshRenderer.bones = joints;
if (skin.inverseBindMatrices != -1)
{
var bindPoses = context.GLTF.GetArrayFromAccessor <Matrix4x4>(skin.inverseBindMatrices)
.Select(inverter.InvertMat4)
.ToArray()
;
mesh.bindposes = bindPoses;
}
else
{
//
// calc default matrices
// https://docs.unity3d.com/ScriptReference/Mesh-bindposes.html
//
var meshCoords = skinnedMeshRenderer.transform; // ?
var calculatedBindPoses = joints.Select(y => y.worldToLocalMatrix * meshCoords.localToWorldMatrix).ToArray();
mesh.bindposes = calculatedBindPoses;
}
}
else
{
// BlendShape only ?
}
skinnedMeshRenderer.sharedMesh = mesh;
if (skin.skeleton >= 0 && skin.skeleton < nodes.Count)
{
skinnedMeshRenderer.rootBone = nodes[skin.skeleton].Transform;
}
}
}
}
}
public static AnimationClip ConvertAnimationClip(glTF gltf, glTFAnimation animation, AxisInverter inverter, glTFNode root = null)
{
var clip = new AnimationClip();
clip.ClearCurves();
clip.legacy = true;
clip.name = animation.name;
clip.wrapMode = WrapMode.Loop;
foreach (var channel in animation.channels)
{
var relativePath = RelativePathFrom(gltf.nodes, root, gltf.nodes[channel.target.node]);
switch (channel.target.path)
{
case glTFAnimationTarget.PATH_TRANSLATION:
{
var sampler = animation.samplers[channel.sampler];
var input = gltf.GetArrayFromAccessor <float>(sampler.input);
var output = gltf.FlatternFloatArrayFromAccessor(sampler.output);
AnimationImporterUtil.SetAnimationCurve(
clip,
relativePath,
new string[] { "localPosition.x", "localPosition.y", "localPosition.z" },
input,
output,
sampler.interpolation,
typeof(Transform),
(values, last) =>
{
Vector3 temp = new Vector3(values[0], values[1], values[2]);
return(inverter.InvertVector3(temp).ToArray());
}
);
}
break;
case glTFAnimationTarget.PATH_ROTATION:
{
var sampler = animation.samplers[channel.sampler];
var input = gltf.GetArrayFromAccessor <float>(sampler.input);
var output = gltf.FlatternFloatArrayFromAccessor(sampler.output);
AnimationImporterUtil.SetAnimationCurve(
clip,
relativePath,
new string[] { "localRotation.x", "localRotation.y", "localRotation.z", "localRotation.w" },
input,
output,
sampler.interpolation,
typeof(Transform),
(values, last) =>
{
Quaternion currentQuaternion = new Quaternion(values[0], values[1], values[2], values[3]);
Quaternion lastQuaternion = new Quaternion(last[0], last[1], last[2], last[3]);
return(AnimationImporterUtil.GetShortest(lastQuaternion, inverter.InvertQuaternion(currentQuaternion)).ToArray());
}
);
clip.EnsureQuaternionContinuity();
}
break;
case glTFAnimationTarget.PATH_SCALE:
{
var sampler = animation.samplers[channel.sampler];
var input = gltf.GetArrayFromAccessor <float>(sampler.input);
var output = gltf.FlatternFloatArrayFromAccessor(sampler.output);
AnimationImporterUtil.SetAnimationCurve(
clip,
relativePath,
new string[] { "localScale.x", "localScale.y", "localScale.z" },
input,
output,
sampler.interpolation,
typeof(Transform),
(values, last) => values);
}
break;
case glTFAnimationTarget.PATH_WEIGHT:
{
var node = gltf.nodes[channel.target.node];
var mesh = gltf.meshes[node.mesh];
var primitive = mesh.primitives.FirstOrDefault();
var targets = primitive.targets;
if (!gltf_mesh_extras_targetNames.TryGet(mesh, out List <string> targetNames))
{
throw new Exception("glTF BlendShape Animation. targetNames invalid.");
}
var keyNames = targetNames
.Where(x => !string.IsNullOrEmpty(x))
.Select(x => "blendShape." + x)
.ToArray();
var sampler = animation.samplers[channel.sampler];
var input = gltf.GetArrayFromAccessor <float>(sampler.input);
var output = gltf.GetArrayFromAccessor <float>(sampler.output);
AnimationImporterUtil.SetAnimationCurve(
clip,
relativePath,
keyNames,
input,
output,
sampler.interpolation,
typeof(SkinnedMeshRenderer),
(values, last) =>
{
for (int j = 0; j < values.Length; j++)
{
values[j] *= 100.0f;
}
return(values);
});
}
break;
default:
Debug.LogWarningFormat("unknown path: {0}", channel.target.path);
break;
}
}
return(clip);
}
//
// fix node's coordinate. z-back to z-forward
//
public static void FixCoordinate(ImporterContext context, List <TransformWithSkin> nodes, AxisInverter inverter)
{
var globalTransformMap = nodes.ToDictionary(x => x.Transform, x => new PosRot
{
Position = x.Transform.position,
Rotation = x.Transform.rotation,
});
foreach (var x in context.GLTF.rootnodes)
{
// fix nodes coordinate
// reverse Z in global
var t = nodes[x].Transform;
//t.SetParent(root.transform, false);
foreach (var transform in t.Traverse())
{
var g = globalTransformMap[transform];
transform.position = inverter.InvertVector3(g.Position);
transform.rotation = inverter.InvertQuaternion(g.Rotation);
}
}
}