private void ProcessModel(GltfFile modelFile, GltfFile[] animFiles)
{
var modelPath = modelFile.Path;
var modelData = modelFile.Data;
var modelName = Path.GetFileNameWithoutExtension(modelPath);
var outputModelFolder = Path.Combine(OutputFolder, modelName);
Directory.CreateDirectory(outputModelFolder);
Log.WriteLine($"Copying images...");
if (modelData.Images != null)
{
using (Log.Indented())
{
CopyImages(modelData, modelPath, outputModelFolder);
}
}
Log.WriteLine($"Fetching model buffers...");
using (Log.Indented())
{
FetchBuffers(modelData, modelPath);
}
var modelNodeIndexByName = modelData.Nodes.Select((n, i) => (n, i))
.ToDictionary(pair => pair.Item1.Name, pair => pair.Item2);
foreach (GltfFile animFile in animFiles)
{
Log.WriteLine($"Processing animations in {animFile.Path}...");
using (Log.Indented())
{
ProcessAnimations(modelFile, animFile, modelNodeIndexByName, outputModelFolder);
}
// The anim-file-data was modified, reload next time.
animFile.Invalidate();
}
var outputBufferPath = Path.Combine(outputModelFolder, OutputBufferFilename);
using (var newBufferStream = File.Create(outputBufferPath))
{
Log.WriteLine($"Packing all accessors in a single buffer...");
PackAccessors(modelFile, newBufferStream, OutputBufferFilename);
Log.WriteLine($"Writing model glTF file...");
var outputModelPath = Path.Combine(outputModelFolder, OutputModelFilename);
modelData.SaveModel(outputModelPath);
}
}
private void ProcessAnimations(GltfFile modelFile, GltfFile animFile, Dictionary <string, int> modelNodeIndexByName, string outputModelFolder)
{
foreach (Animation animation in animFile.Data.Animations)
{
using (Log.Indented())
{
Log.WriteLine($"Processing animation clip {animation.Name} in {animFile.Path}...");
using (Log.Indented())
{
ProcessAnimation(modelFile, animFile, animation, modelNodeIndexByName, outputModelFolder);
}
}
}
}
private void ProcessAnimation(GltfFile modelFile, GltfFile animFile, Animation animation, Dictionary <string, int> modelNodeIndexByName, string outputModelFolder)
{
var animData = animFile.Data;
var modelData = modelFile.Data;
// Load all animation buffers into memory
// TODO: This could be done lazily!
FetchBuffers(animData, animFile.Path);
foreach (var channel in animation.Channels)
{
var nodeIndex = channel.Target?.Node;
if (nodeIndex.HasValue)
{
var nodeName = animData.Nodes[nodeIndex.Value].Name;
if (!_allModelNodeNames.Contains(nodeName))
{
Log.WriteLine($"WARNING: Clip node '{nodeName}' not found in any model. Similar node names are:");
using (Log.Indented())
{
Fastenshtein.Levenshtein lev = new Fastenshtein.Levenshtein(nodeName);
Log.WriteLine(string.Join(", ", _allModelNodeNames.OrderBy(lev.DistanceFrom).Take(3)));
}
}
}
}
int tc = 0;
int rc = 0;
int sc = 0;
int wc = 0;
// Keep only those animation channels that animate the current model,
// and are different from the initial scene
AnimationChannel[] clipChannels = animation
.Channels
.Where(channel =>
{
var nodeIndex = channel?.Target?.Node;
if (!nodeIndex.HasValue)
{
return(false);
}
var node = animData.Nodes[nodeIndex.Value];
if (!modelNodeIndexByName.ContainsKey(node.Name))
{
return(false);
}
var sampler = animation.Samplers[channel.Sampler];
var outputAccessor = animData.Accessors[sampler.Output];
// We assume the exporter already reduced constant curves to a single key.
if (outputAccessor.Count != 1)
{
return(true);
}
// We don't handle sparse data yet, keep it
if (!outputAccessor.BufferView.HasValue)
{
return(true);
}
var mesh = node.Mesh.HasValue ? animData.Meshes[node.Mesh.Value] : null;
var outputValues = GetComponentAtIndex(animData, outputAccessor, 0);
switch (channel.Target.Path)
{
case AnimationChannelTarget.PathEnum.translation:
return(AreDifferent(ref tc, outputValues, node.Translation ?? DefaultTranslation, 1e-3f));
case AnimationChannelTarget.PathEnum.rotation:
return(AreDifferent(ref rc, outputValues, node.Rotation ?? DefaultRotation, 1e-4f));
case AnimationChannelTarget.PathEnum.scale:
return(AreDifferent(ref sc, outputValues, node.Scale ?? DefaultScale, 1e-4f));
case AnimationChannelTarget.PathEnum.weights:
return(AreDifferent(ref wc, outputValues, node.Weights ?? mesh?.Weights, 1e-3f));
default:
return(true);
}
})
.ToArray();
if (clipChannels.Length == 0)
{
Log.WriteLine($"NOTE: Animation '{animation.Name}' is not used by model '{modelFile.Path}'");
return;
}
if (tc + rc + sc + wc > 0)
{
Log.WriteLine($"Skipped {tc} translation, {rc} rotation, {sc} scaling and {wc} weight redundant animation channels");
}
// Keep only those samplers used by any channel
AnimationSampler[] clipSamplers = clipChannels
.Select(channel => animation.Samplers[channel.Sampler])
.Distinct()
.ToArray();
AnimationChannelTarget[] clipTargets = clipChannels
.Select(channel => channel.Target)
.ToArray();
Accessor[] clipSamplerInputs = clipSamplers.Select(sampler => animData.Accessors[sampler.Input]).ToArray();
Accessor[] clipSamplerOutputs = clipSamplers.Select(sampler => animData.Accessors[sampler.Output]).ToArray();
Accessor[] clipAccessors = clipSamplerInputs.Concat(clipSamplerOutputs).Distinct().ToArray();
Remapper <Accessor> newAccessors = modelData.Accessors.Concat(clipAccessors).RemapFrom(animData.Accessors);
Remapper <AnimationSampler> newSamplers = clipSamplers.RemapFrom(animation.Samplers);
Remapper <AnimationChannel> newChannels = clipChannels.RemapFrom(animation.Channels);
// Remap sampler indices
foreach (var sampler in clipSamplers)
{
sampler.Input = newAccessors.Remap(sampler.Input);
sampler.Output = newAccessors.Remap(sampler.Output);
}
// Remap channel indices
foreach (var channel in clipChannels)
{
channel.Sampler = newSamplers.Remap(channel.Sampler);
}
// Remap animation channel targets
foreach (var target in clipTargets)
{
// ReSharper disable once PossibleInvalidOperationException
var clipNode = animData.Nodes[(int)target.Node];
var nodeIndex = modelNodeIndexByName[clipNode.Name];
target.Node = nodeIndex;
}
animation.Channels = newChannels.OutputItems;
animation.Samplers = newSamplers.OutputItems;
var clipBufferViews = clipAccessors
.Select(a => a.BufferView)
.Where(bv => bv.HasValue)
.Select(bv => bv.Value)
.Distinct()
.Select(i => animData.BufferViews[i])
.ToArray();
var newBufferViews = modelData.BufferViews.Concat(clipBufferViews)
.RemapFrom(animData.BufferViews);
// Remap clip accessor indices
foreach (var accessor in clipAccessors)
{
if (accessor.BufferView.HasValue)
{
accessor.BufferView = newBufferViews.Remap(accessor.BufferView.Value);
}
}
var clipBuffers = clipBufferViews
.Select(bv => bv.Buffer)
.Distinct()
.Select(i => animData.Buffers[i])
.ToArray();
var newBuffers = modelData.Buffers.Concat(clipBuffers).RemapFrom(animData.Buffers);
// Remap buffer view indices
foreach (var bufferView in clipBufferViews)
{
bufferView.Buffer = newBuffers.Remap(bufferView.Buffer);
}
// TODO: Animation indices don't need to be remapped?
modelData.Animations = (modelData.Animations ?? Array.Empty <Animation>()).Append(animation).ToArray();
modelData.Accessors = newAccessors.OutputItems;
modelData.BufferViews = newBufferViews.OutputItems;
modelData.Buffers = newBuffers.OutputItems;
}
/// <summary>
/// Creates a single buffer and a minimum number of buffer-views to pack all the accessors.
/// </summary>
private void PackAccessors(GltfFile modelFile, Stream newBufferStream, string outputBufferUri)
{
var fileData = modelFile.Data;
var buffers = fileData.Buffers;
var bufferViews = fileData.BufferViews;
// TODO: Check sparse accessors
// Group accessor by optional target, component-stride and component byte-length
// For each group, we need to create a single buffer-view.
var accessorGroups = fileData
.Accessors
.Where(a => a.BufferView.HasValue)
.GroupBy(a => (target: bufferViews[a.BufferView.Value].Target, stride: a.GetByteStride(bufferViews) /*, componentByteLength: a.GetComponentByteLength()*/))
.ToDictionary(g => g.Key, g => g.ToArray());
// NOTE: The following select sequence has a side-effect
var newBufferViews = accessorGroups
.Select((pair, newBufferViewIndex) =>
{
//var ((target, stride, componentByteLength), accessors) = pair;
var((target, stride), accessors) = pair;
var newBufferViewOffset = (int)newBufferStream.Position;
//Debug.Assert(newBufferStream.GetComponentPadding(componentByteLength) == 0);
foreach (var accessor in accessors)
{
var componentByteLength = accessor.GetComponentByteLength();
var accessorPadding = newBufferStream.GetComponentPadding(componentByteLength);
newBufferStream.WriteByte(0, accessorPadding);
var newAccessorByteOffset = (int)(newBufferStream.Position - newBufferViewOffset);
Debug.Assert(accessor.BufferView.HasValue);
var bufferView = bufferViews[accessor.BufferView.Value];
var buffer = buffers[bufferView.Buffer];
var data = _bufferFileData[buffer];
var bufferOffset = bufferView.ByteOffset + accessor.ByteOffset;
var rowLength = accessor.GetComponentDimension() * componentByteLength;
for (int i = 0; i < accessor.Count; ++i)
{
Debug.Assert(newBufferStream.GetComponentPadding(componentByteLength) == 0);
newBufferStream.Write(data, bufferOffset + i * stride, rowLength);
Debug.Assert(newBufferStream.GetComponentPadding(componentByteLength) == 0);
}
// Patch the accessor.
accessor.ByteOffset = newAccessorByteOffset;
accessor.BufferView = newBufferViewIndex;
}
var newBufferView = new BufferView
{
Target = target,
ByteOffset = newBufferViewOffset,
ByteStride = target == BufferView.TargetEnum.ARRAY_BUFFER ? stride : (int?)null,
ByteLength = (int)(newBufferStream.Position - newBufferViewOffset)
};
return(newBufferView);
})
.ToArray();
var newBuffer = new Buffer
{
ByteLength = (int)newBufferStream.Length,
Uri = outputBufferUri
};
fileData.BufferViews = newBufferViews;
fileData.Buffers = new[] { newBuffer };
}