public static Animation ConvertFromAssimpScene(Ai.Scene aiScene, Ai.Animation aiAnimation, AnimationConverterOptions options)
{
var animation = new Animation(options.Version);
animation.Duration = ConvertTime(aiAnimation.DurationInTicks, aiAnimation.TicksPerSecond);
foreach (var aiChannel in aiAnimation.NodeAnimationChannels)
{
if (AssimpConverterCommon.MeshAttachmentNameRegex.IsMatch(aiChannel.NodeName))
{
continue;
}
var nodeName = AssimpConverterCommon.UnescapeName(aiChannel.NodeName);
var controller = new AnimationController(options.Version)
{
TargetKind = TargetKind.Node,
TargetName = nodeName,
TargetId = GetTargetIdForNode(aiScene.RootNode, nodeName)
};
var track = new KeyframeTrack(options.Version);
// NodePRS only for now
track.KeyframeType = KeyframeType.NodePRS;
// Fetch the unique key frame timings from all position, rotation and scale keys.
var keyframeTimings = aiChannel.PositionKeys
.Select(x => x.Time)
.Concat(aiChannel.RotationKeys.Select(x => x.Time))
.Concat(aiChannel.ScalingKeys.Select(x => x.Time))
.Distinct()
.OrderBy(x => x);
// Convert the times to our scale and save them.
track.KeyframeTimings = keyframeTimings
.Select(x => ConvertTime(x, aiAnimation.TicksPerSecond))
.ToList();
// Decompose the local transform of the affected node so we can use them as the base values for our keyframes
aiScene.RootNode.FindNode(nodeName).Transform
.Decompose(out var nodeBaseScale, out var nodeBaseRotation, out var nodeBaseTranslation);
// Keep track of the last position, rotation and scale used to ensure that interpolation works properly
var lastPosition = nodeBaseTranslation;
var lastRotation = nodeBaseRotation;
var lastScale = nodeBaseScale;
foreach (var time in keyframeTimings)
{
// Start building the keyframe
var keyframe = new KeyframePRS(track.KeyframeType)
{
Position = new Vector3(lastPosition.X, lastPosition.Y, lastPosition.Z),
Rotation = new Quaternion(lastRotation.X, lastRotation.Y, lastRotation.Z, lastRotation.W),
Scale = new Vector3(lastScale.X, lastScale.Y, lastScale.Z)
};
// Fetch the Assimp keys for this time
var aiPositionKey = aiChannel.PositionKeys.SingleOrDefault(x => x.Time == time);
var aiRotationKey = aiChannel.RotationKeys.SingleOrDefault(x => x.Time == time);
var aiScaleKey = aiChannel.ScalingKeys.SingleOrDefault(x => x.Time == time);
if (aiPositionKey != default(Ai.VectorKey))
{
keyframe.Position = new Vector3(aiPositionKey.Value.X, aiPositionKey.Value.Y, aiPositionKey.Value.Z);
lastPosition = aiPositionKey.Value;
}
if (aiRotationKey != default(Ai.QuaternionKey))
{
keyframe.Rotation = new Quaternion(aiRotationKey.Value.X, aiRotationKey.Value.Y, aiRotationKey.Value.Z,
aiRotationKey.Value.W);
lastRotation = aiRotationKey.Value;
}
if (aiScaleKey != default(Ai.VectorKey))
{
keyframe.Scale = new Vector3(aiScaleKey.Value.X, aiScaleKey.Value.Y, aiScaleKey.Value.Z);
lastScale = aiScaleKey.Value;
}
track.Keyframes.Add(keyframe);
}
controller.Tracks.Add(track);
animation.Controllers.Add(controller);
}
return(animation);
}
public static Animation ConvertFromAssimpScene(string filePath, AnimationConverterOptions options)
{
var aiScene = AssimpSceneImporter.ImportFile(filePath);
return(ConvertFromAssimpScene(aiScene, options));
}
public static Animation ConvertFromAssimpScene(Ai.Scene aiScene, AnimationConverterOptions options)
{
var aiAnimation = aiScene.Animations.FirstOrDefault();
return(aiAnimation != null?ConvertFromAssimpScene(aiScene, aiAnimation, options) : null);
}
