protected override void GetValueCore(TimeSpan time, ref SkeletonPose defaultSource, ref SkeletonPose defaultTarget, ref SkeletonPose result)
{
// Update time of the AvatarAnimation.
_avatarAnimation.CurrentPosition = time;
// Get bone transforms and convert to type SrtTransform.
for (int i = 0; i < AvatarRenderer.BoneCount; i++)
{
result.SetBoneTransform(i, SrtTransform.FromMatrix(_avatarAnimation.BoneTransforms[i]));
}
}
/// <summary>
/// Converts the bind pose matrices to SRT transforms.
/// </summary>
/// <param name="bindPoses">The bind pose matrices.</param>
/// <returns>The equivalent SRT transforms.</returns>
private static IList <SrtTransform> ConvertToSrt(IList <Matrix> bindPoses)
{
var numberOfBones = bindPoses.Count;
var result = new SrtTransform[numberOfBones];
for (int i = 0; i < numberOfBones; i++)
{
result[i] = SrtTransform.FromMatrix(bindPoses[i]);
}
return(result);
}
private void BuildSkeleton()
{
// Get an array of all bones in depth-first order.
// (Same as MeshHelper.FlattenSkeleton(root).)
var bones = TreeHelper.GetSubtree(_rootBone, n => n.Children.OfType <BoneContent>(), true)
.ToList();
// Create list of parent indices, bind pose transformations and bone names.
var boneParents = new List <int>();
var bindTransforms = new List <SrtTransform>();
var boneNames = new List <string>();
int numberOfWarnings = 0;
foreach (var bone in bones)
{
int parentIndex = bones.IndexOf(bone.Parent as BoneContent);
boneParents.Add(parentIndex);
// Log warning for invalid transform matrices - but not too many warnings.
if (numberOfWarnings < 2)
{
if (!SrtTransform.IsValid((Matrix)bone.Transform))
{
if (numberOfWarnings < 1)
{
_context.Logger.LogWarning(null, _input.Identity, "Bone transform is not supported. Bone transform matrices may only contain scaling, rotation and translation.");
}
else
{
_context.Logger.LogWarning(null, _input.Identity, "More unsupported bone transform found.");
}
numberOfWarnings++;
}
}
bindTransforms.Add(SrtTransform.FromMatrix(bone.Transform));
if (boneNames.Contains(bone.Name))
{
string message = String.Format(CultureInfo.InvariantCulture, "Duplicate bone name (\"{0}\") found.", bone.Name);
throw new InvalidContentException(message, _input.Identity);
}
boneNames.Add(bone.Name);
}
// Create and return a new skeleton instance.
_skeleton = new Skeleton(boneParents, boneNames, bindTransforms);
}
public void FromToMatrixTest()
{
var t = new Vector3F(1, 2, 3);
var r = new QuaternionF(1, 2, 3, 4).Normalized;
var s = new Vector3F(2, 7, 9);
var m = Matrix44F.CreateTranslation(t) * Matrix44F.CreateRotation(r) * Matrix44F.CreateScale(s);
var srt = SrtTransform.FromMatrix(m);
Assert.IsTrue(Vector3F.AreNumericallyEqual(t, srt.Translation));
Assert.IsTrue(QuaternionF.AreNumericallyEqual(r, srt.Rotation));
Assert.IsTrue(Vector3F.AreNumericallyEqual(s, srt.Scale));
// XNA:
srt = SrtTransform.FromMatrix((Matrix)m);
Assert.IsTrue(Vector3F.AreNumericallyEqual(t, srt.Translation));
Assert.IsTrue(QuaternionF.AreNumericallyEqual(r, srt.Rotation));
Assert.IsTrue(Vector3F.AreNumericallyEqual(s, srt.Scale));
// With negative scale, the decomposition is not unique (many possible combinations of
// axis mirroring + rotation).
t = new Vector3F(1, 2, 3);
r = new QuaternionF(1, 2, 3, 4).Normalized;
s = new Vector3F(2, -7, 9);
m = Matrix44F.CreateTranslation(t) * Matrix44F.CreateRotation(r) * Matrix44F.CreateScale(s);
srt = SrtTransform.FromMatrix(m);
var m2 = (Matrix44F)srt;
Assert.IsTrue(Matrix44F.AreNumericallyEqual(m, m2));
m2 = srt.ToMatrix44F();
Assert.IsTrue(Matrix44F.AreNumericallyEqual(m, m2));
m2 = srt;
Assert.IsTrue(Matrix44F.AreNumericallyEqual(m, m2));
Matrix mXna = srt.ToXna();
Assert.IsTrue(Matrix44F.AreNumericallyEqual(m, (Matrix44F)mXna));
mXna = srt;
Assert.IsTrue(Matrix44F.AreNumericallyEqual(m, (Matrix44F)mXna));
}
//--------------------------------------------------------------
#region Avatar Skeleton Animation
//--------------------------------------------------------------
/// <summary>
/// Converts an intermediate-format content pipeline AnimationContent object
/// to a SkeletonKeyFrameAnimation.
/// </summary>
private SkeletonKeyFrameAnimation ProcessSkeletonAnimation(AnimationContent animationContent, ContentProcessorContext context)
{
if (animationContent.Duration <= TimeSpan.Zero)
{
throw new InvalidContentException("Animation has a zero duration.", animationContent.Identity);
}
// Create a SkeletonPose key frame animation that will animate the SkeletonPose
// property of an AvatarPose.
var animation = new SkeletonKeyFrameAnimation
{
TargetProperty = "SkeletonPose",
};
// Process each channel in the animation
int numberOfKeyFrames = 0;
foreach (KeyValuePair <string, AnimationChannel> item in animationContent.Channels)
{
var channelName = item.Key;
channelName = CleanBoneName(channelName);
var channel = item.Value;
// Don't add animation nodes with "_END" in the name
// -- These bones were removed from the skeleton already
if (channelName.Contains("_END"))
{
continue;
}
// Look up what bone this channel is controlling.
int boneIndex;
if (!_boneNames.TryGetValue(channelName, out boneIndex))
{
var message = string.Format("Found animation for bone '{0}', which is not part of the skeleton.", channelName);
throw new InvalidContentException(message, animationContent.Identity);
}
// Convert and add the key frame data.
foreach (AnimationKeyframe keyframe in channel)
{
var time = keyframe.Time;
var matrix = CreateKeyFrameMatrix(keyframe, boneIndex);
var srt = SrtTransform.FromMatrix(matrix);
animation.AddKeyFrame(boneIndex, time, srt);
numberOfKeyFrames++;
}
}
if (numberOfKeyFrames == 0)
{
throw new InvalidContentException("Animation has no key frames.", animationContent.Identity);
}
// Compress animation to safe memory.
float removedKeyFrames = animation.Compress(
CompressionScaleThreshold,
CompressionRotationThreshold,
CompressionTranslationThreshold);
if (removedKeyFrames > 0)
{
context.Logger.LogImportantMessage("Compression removed {0:P} of all key frames.", removedKeyFrames);
}
// Finalize the skeleton key frame animation. This optimizes the internal data structures.
animation.Freeze();
return(animation);
}
private ITimeline BakeAnimation(AvatarAnimation avatarAnimation)
{
// Create an AvatarExpression key frame animation that will be applied to the Expression
// property of an AvatarPose.
AvatarExpressionKeyFrameAnimation expressionAnimation = new AvatarExpressionKeyFrameAnimation
{
TargetProperty = "Expression"
};
// Create a SkeletonPose key frame animation that will be applied to the SkeletonPose
// property of an AvatarPose.
SkeletonKeyFrameAnimation skeletonKeyFrameAnimation = new SkeletonKeyFrameAnimation
{
TargetProperty = "SkeletonPose"
};
// In the next loop, we sample the original animation with 30 Hz and store the key frames.
int numberOfKeyFrames = 0;
AvatarExpression previousExpression = new AvatarExpression();
TimeSpan time = TimeSpan.Zero;
TimeSpan length = avatarAnimation.Length;
TimeSpan step = new TimeSpan(333333); // 1/30 seconds;
while (true)
{
// Advance time in AvatarAnimation.
avatarAnimation.CurrentPosition = time;
// Add expression key frame if this is the first key frame or if the key frame is
// different from the last key frame.
AvatarExpression expression = avatarAnimation.Expression;
if (time == TimeSpan.Zero || !expression.Equals(previousExpression))
{
expressionAnimation.KeyFrames.Add(new KeyFrame <AvatarExpression>(time, expression));
}
previousExpression = expression;
// Convert bone transforms to SrtTransforms and add key frames to the SkeletonPose
// animation.
for (int i = 0; i < avatarAnimation.BoneTransforms.Count; i++)
{
SrtTransform boneTransform = SrtTransform.FromMatrix(avatarAnimation.BoneTransforms[i]);
skeletonKeyFrameAnimation.AddKeyFrame(i, time, boneTransform);
numberOfKeyFrames++;
}
// Abort if we have arrived at the end time.
if (time == length)
{
break;
}
// Increase time. We check that we do not step over the end time.
if (time + step > length)
{
time = length;
}
else
{
time += step;
}
}
// Compress animation to save memory.
float numberOfRemovedKeyFrames = skeletonKeyFrameAnimation.Compress(0.1f, 0.1f, 0.001f);
Debug.WriteLine("Compression removed " + numberOfRemovedKeyFrames * 100 + "% of the key frames.");
// Finalize the skeleton key frame animation. This optimizes the internal data structures.
skeletonKeyFrameAnimation.Freeze();
return(new TimelineGroup
{
expressionAnimation,
skeletonKeyFrameAnimation,
});
}
private SkeletonKeyFrameAnimation BuildAnimation(AnimationContent animationContent)
{
string name = animationContent.Name;
// Add loop frame?
bool addLoopFrame = false;
if (_modelDescription != null)
{
var animationDescription = _modelDescription.Animation;
if (animationDescription != null)
{
addLoopFrame = animationDescription.AddLoopFrame ?? false;
if (animationDescription.Splits != null)
{
foreach (var split in animationDescription.Splits)
{
if (split.Name == name)
{
if (split.AddLoopFrame.HasValue)
{
addLoopFrame = split.AddLoopFrame.Value;
}
break;
}
}
}
}
}
var animation = new SkeletonKeyFrameAnimation {
EnableInterpolation = true
};
// Process all animation channels (each channel animates a bone).
int numberOfKeyFrames = 0;
foreach (var item in animationContent.Channels)
{
string channelName = item.Key;
AnimationChannel channel = item.Value;
int boneIndex = _skeleton.GetIndex(channelName);
if (boneIndex != -1)
{
SrtTransform?loopFrame = null;
var bindPoseRelativeInverse = _skeleton.GetBindPoseRelative(boneIndex).Inverse;
foreach (AnimationKeyframe keyframe in channel)
{
TimeSpan time = keyframe.Time;
SrtTransform transform = SrtTransform.FromMatrix(keyframe.Transform);
// The matrix in the key frame is the transformation in the coordinate space of the
// parent bone. --> Convert it to a transformation relative to the animated bone.
transform = bindPoseRelativeInverse * transform;
// To start with minimal numerical errors, we normalize the rotation quaternion.
transform.Rotation.Normalize();
if (loopFrame == null)
{
loopFrame = transform;
}
if (!addLoopFrame || time < animationContent.Duration)
{
animation.AddKeyFrame(boneIndex, time, transform);
}
numberOfKeyFrames++;
}
if (addLoopFrame && loopFrame.HasValue)
{
animation.AddKeyFrame(boneIndex, animationContent.Duration, loopFrame.Value);
}
}
else
{
_context.Logger.LogWarning(
null, animationContent.Identity,
"Found animation for bone \"{0}\", which is not part of the skeleton.",
channelName);
}
}
if (numberOfKeyFrames == 0)
{
_context.Logger.LogWarning(null, animationContent.Identity, "Animation is ignored because it has no keyframes.");
return(null);
}
// Compress animation to save memory.
if (_modelDescription != null)
{
var animationDescription = _modelDescription.Animation;
if (animationDescription != null)
{
float removedKeyFrames = animation.Compress(
animationDescription.ScaleCompression,
animationDescription.RotationCompression,
animationDescription.TranslationCompression);
if (removedKeyFrames > 0)
{
_context.Logger.LogImportantMessage("{0}: Compression removed {1:P} of all key frames.",
string.IsNullOrEmpty(name) ? "Unnamed" : name,
removedKeyFrames);
}
}
}
// Finalize the animation. (Optimizes the animation data for fast runtime access.)
animation.Freeze();
return(animation);
}