private void _exportMorphTargets(BabylonMesh babylonMesh, BabylonSubMesh babylonSubMesh, BabylonMorphTargetManager babylonMorphTargetManager, GLTF gltf, GLTFBuffer buffer, GLTFMeshPrimitive meshPrimitive)
{
var gltfMorphTargets = new List <GLTFMorphTarget>();
foreach (var babylonMorphTarget in babylonMorphTargetManager.targets)
{
var gltfMorphTarget = new GLTFMorphTarget();
// Positions
if (babylonMorphTarget.positions != null)
{
var accessorTargetPositions = GLTFBufferService.Instance.CreateAccessor(
gltf,
GLTFBufferService.Instance.GetBufferViewFloatVec3(gltf, buffer),
"accessorTargetPositions",
GLTFAccessor.ComponentType.FLOAT,
GLTFAccessor.TypeEnum.VEC3
);
gltfMorphTarget.Add(GLTFMorphTarget.Attribute.POSITION.ToString(), accessorTargetPositions.index);
// Populate accessor
int nbComponents = 3; // Vector3
int startIndex = babylonSubMesh.verticesStart * nbComponents;
int endIndex = startIndex + babylonSubMesh.verticesCount * nbComponents;
accessorTargetPositions.min = new float[] { float.MaxValue, float.MaxValue, float.MaxValue };
accessorTargetPositions.max = new float[] { float.MinValue, float.MinValue, float.MinValue };
for (int indexPosition = startIndex; indexPosition < endIndex; indexPosition += 3)
{
var positionTarget = Tools.SubArray(babylonMorphTarget.positions, indexPosition, 3);
// Babylon stores morph target information as final data while glTF expects deltas from mesh primitive
var positionMesh = Tools.SubArray(babylonMesh.positions, indexPosition, 3);
for (int indexCoordinate = 0; indexCoordinate < positionTarget.Length; indexCoordinate++)
{
positionTarget[indexCoordinate] = positionTarget[indexCoordinate] - positionMesh[indexCoordinate];
}
positionTarget[2] *= -1;
// Store values as bytes
foreach (var coordinate in positionTarget)
{
accessorTargetPositions.bytesList.AddRange(BitConverter.GetBytes(coordinate));
}
// Update min and max values
GLTFBufferService.UpdateMinMaxAccessor(accessorTargetPositions, positionTarget);
}
accessorTargetPositions.count = babylonSubMesh.verticesCount;
}
// Normals
if ((babylonMorphTarget.normals != null) && _exportMorphNormal)
{
var accessorTargetNormals = GLTFBufferService.Instance.CreateAccessor(
gltf,
GLTFBufferService.Instance.GetBufferViewFloatVec3(gltf, buffer),
"accessorTargetNormals",
GLTFAccessor.ComponentType.FLOAT,
GLTFAccessor.TypeEnum.VEC3
);
gltfMorphTarget.Add(GLTFMorphTarget.Attribute.NORMAL.ToString(), accessorTargetNormals.index);
// Populate accessor
int nbComponents = 3; // Vector3
int startIndex = babylonSubMesh.verticesStart * nbComponents;
int endIndex = startIndex + babylonSubMesh.verticesCount * nbComponents;
for (int indexNormal = startIndex; indexNormal < endIndex; indexNormal += 3)
{
var normalTarget = Tools.SubArray(babylonMorphTarget.normals, indexNormal, 3);
// Babylon stores morph target information as final data while glTF expects deltas from mesh primitive
var normalMesh = Tools.SubArray(babylonMesh.normals, indexNormal, 3);
for (int indexCoordinate = 0; indexCoordinate < normalTarget.Length; indexCoordinate++)
{
normalTarget[indexCoordinate] = normalTarget[indexCoordinate] - normalMesh[indexCoordinate];
}
normalTarget[2] *= -1;
// Store values as bytes
foreach (var coordinate in normalTarget)
{
accessorTargetNormals.bytesList.AddRange(BitConverter.GetBytes(coordinate));
}
}
accessorTargetNormals.count = babylonSubMesh.verticesCount;
}
// Tangents
if ((babylonMorphTarget.tangents != null) && _exportMorphTangent)
{
var accessorTargetTangents = GLTFBufferService.Instance.CreateAccessor(
gltf,
GLTFBufferService.Instance.GetBufferViewFloatVec3(gltf, buffer),
"accessorTargetTangents",
GLTFAccessor.ComponentType.FLOAT,
GLTFAccessor.TypeEnum.VEC3
);
gltfMorphTarget.Add(GLTFMeshPrimitive.Attribute.TANGENT.ToString(), accessorTargetTangents.index);
// Populate accessor
// Note that the w component for handedness is omitted when targeting TANGENT data since handedness cannot be displaced.
int nbComponents = 4; // Vector4
int startIndex = babylonSubMesh.verticesStart * nbComponents;
int endIndex = startIndex + babylonSubMesh.verticesCount * nbComponents;
for (int indexTangent = startIndex; indexTangent < endIndex; indexTangent += 4)
{
var tangentTarget = Tools.SubArray(babylonMorphTarget.tangents, indexTangent, 3);
// Babylon stores morph target information as final data while glTF expects deltas from mesh primitive
var tangentMesh = Tools.SubArray(babylonMesh.tangents, indexTangent, 3);
for (int indexCoordinate = 0; indexCoordinate < tangentTarget.Length; indexCoordinate++)
{
tangentTarget[indexCoordinate] = tangentTarget[indexCoordinate] - tangentMesh[indexCoordinate];
}
tangentTarget[2] *= -1;
// Store values as bytes
foreach (var coordinate in tangentTarget)
{
accessorTargetTangents.bytesList.AddRange(BitConverter.GetBytes(coordinate));
}
}
accessorTargetTangents.count = babylonSubMesh.verticesCount;
}
gltfMorphTargets.Add(gltfMorphTarget);
}
if (gltfMorphTargets.Count > 0)
{
meshPrimitive.targets = gltfMorphTargets.ToArray();
}
}
private void _exportMorphTargets(BabylonMesh babylonMesh, BabylonMorphTargetManager babylonMorphTargetManager, GLTF gltf, GLTFBuffer buffer, GLTFMeshPrimitive meshPrimitive, List <float> weights)
{
var gltfMorphTargets = new List <GLTFMorphTarget>();
foreach (var babylonMorphTarget in babylonMorphTargetManager.targets)
{
var gltfMorphTarget = new GLTFMorphTarget();
// Positions
if (babylonMorphTarget.positions != null)
{
var accessorTargetPositions = GLTFBufferService.Instance.CreateAccessor(
gltf,
GLTFBufferService.Instance.GetBufferViewFloatVec3(gltf, buffer),
"accessorTargetPositions",
GLTFAccessor.ComponentType.FLOAT,
GLTFAccessor.TypeEnum.VEC3
);
gltfMorphTarget.Add(GLTFMorphTarget.Attribute.POSITION.ToString(), accessorTargetPositions.index);
// Populate accessor
accessorTargetPositions.min = new float[] { float.MaxValue, float.MaxValue, float.MaxValue };
accessorTargetPositions.max = new float[] { float.MinValue, float.MinValue, float.MinValue };
for (int indexPosition = 0; indexPosition < babylonMorphTarget.positions.Length; indexPosition += 3)
{
var positionTarget = Tools.SubArray(babylonMorphTarget.positions, indexPosition, 3);
// Babylon stores morph target information as final data while glTF expects deltas from mesh primitive
var positionMesh = Tools.SubArray(babylonMesh.positions, indexPosition, 3);
for (int indexCoordinate = 0; indexCoordinate < positionTarget.Length; indexCoordinate++)
{
positionTarget[indexCoordinate] = positionTarget[indexCoordinate] - positionMesh[indexCoordinate];
}
// Store values as bytes
foreach (var coordinate in positionTarget)
{
accessorTargetPositions.bytesList.AddRange(BitConverter.GetBytes(coordinate));
}
// Update min and max values
GLTFBufferService.UpdateMinMaxAccessor(accessorTargetPositions, positionTarget);
}
accessorTargetPositions.count = babylonMorphTarget.positions.Length / 3;
}
// Normals
if (babylonMorphTarget.normals != null)
{
var accessorTargetNormals = GLTFBufferService.Instance.CreateAccessor(
gltf,
GLTFBufferService.Instance.GetBufferViewFloatVec3(gltf, buffer),
"accessorTargetNormals",
GLTFAccessor.ComponentType.FLOAT,
GLTFAccessor.TypeEnum.VEC3
);
gltfMorphTarget.Add(GLTFMorphTarget.Attribute.NORMAL.ToString(), accessorTargetNormals.index);
// Populate accessor
for (int indexNormal = 0; indexNormal < babylonMorphTarget.positions.Length; indexNormal += 3)
{
var normalTarget = Tools.SubArray(babylonMorphTarget.normals, indexNormal, 3);
// Babylon stores morph target information as final data while glTF expects deltas from mesh primitive
var normalMesh = Tools.SubArray(babylonMesh.normals, indexNormal, 3);
for (int indexCoordinate = 0; indexCoordinate < normalTarget.Length; indexCoordinate++)
{
normalTarget[indexCoordinate] = normalTarget[indexCoordinate] - normalMesh[indexCoordinate];
}
// Store values as bytes
foreach (var coordinate in normalTarget)
{
accessorTargetNormals.bytesList.AddRange(BitConverter.GetBytes(coordinate));
}
}
accessorTargetNormals.count = babylonMorphTarget.normals.Length / 3;
}
if (gltfMorphTarget.Count > 0)
{
gltfMorphTargets.Add(gltfMorphTarget);
weights.Add(babylonMorphTarget.influence);
}
}
if (gltfMorphTargets.Count > 0)
{
meshPrimitive.targets = gltfMorphTargets.ToArray();
}
}
