public GLTFBufferView GetBufferViewAnimationFloatVec4(GLTF gltf, GLTFBuffer buffer)
{
if (gltf.bufferViewAnimationFloatVec4 == null)
{
var bufferView = CreateBufferView(gltf, buffer, "bufferViewAnimationFloatVec4");
gltf.bufferViewAnimationFloatVec4 = bufferView;
}
return(gltf.bufferViewAnimationFloatVec4);
}
public GLTFBufferView GetBufferViewFloatMat4(GLTF gltf, GLTFBuffer buffer)
{
if (gltf.bufferViewFloatMat4 == null)
{
var bufferView = CreateBufferView(gltf, buffer, "bufferViewFloatMat4");
gltf.bufferViewFloatMat4 = bufferView;
}
return(gltf.bufferViewFloatMat4);
}
private void AddElementsToAccessor(GLTFAccessor accessor, int count)
{
GLTFBufferView bufferView = accessor.BufferView;
GLTFBuffer buffer = bufferView.Buffer;
accessor.byteOffset = bufferView.byteLength;
accessor.count += count;
bufferView.byteLength += accessor.getByteLength();
buffer.byteLength += accessor.getByteLength();
}
public GLTFBufferView GetBufferViewFloatVec4(GLTF gltf, GLTFBuffer buffer)
{
if (gltf.bufferViewFloatVec4 == null)
{
var bufferView = CreateBufferView(gltf, buffer, "bufferViewFloatVec4");
bufferView.byteStride = 16;
gltf.bufferViewFloatVec4 = bufferView;
}
return(gltf.bufferViewFloatVec4);
}
public GLTFBufferView GetBufferViewFloatVec2(GLTF gltf, GLTFBuffer buffer)
{
if (gltf.bufferViewFloatVec2 == null)
{
var bufferView = CreateBufferView(gltf, buffer, "bufferViewFloatVec2");
bufferView.byteStride = 8;
gltf.bufferViewFloatVec2 = bufferView;
}
return(gltf.bufferViewFloatVec2);
}
private GLTFBufferView CreateBufferView(GLTF gltf, GLTFBuffer buffer, string name)
{
var bufferView = new GLTFBufferView
{
name = name,
buffer = buffer.index,
Buffer = buffer
};
bufferView.index = gltf.BufferViewsList.Count;
gltf.BufferViewsList.Add(bufferView);
buffer.BufferViews.Add(bufferView);
return(bufferView);
}
public GLTFBuffer GetBuffer(GLTF gltf)
{
var buffer = gltf.buffer;
if (buffer == null)
{
buffer = new GLTFBuffer
{
uri = gltf.OutputFile + ".bin"
};
buffer.index = gltf.BuffersList.Count;
gltf.BuffersList.Add(buffer);
gltf.buffer = buffer;
}
return(buffer);
}
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 GLTFNode ExportMesh(BabylonMesh babylonMesh, GLTF gltf, GLTFNode gltfParentNode, BabylonScene babylonScene)
{
RaiseMessage("GLTFExporter.Mesh | Export mesh named: " + babylonMesh.name, 1);
// --------------------------
// ---------- Node ----------
// --------------------------
RaiseMessage("GLTFExporter.Mesh | Node", 2);
// Node
var gltfNode = new GLTFNode();
gltfNode.name = babylonMesh.name;
gltfNode.index = gltf.NodesList.Count;
gltf.NodesList.Add(gltfNode);
// Hierarchy
if (gltfParentNode != null)
{
RaiseMessage("GLTFExporter.Mesh | Add " + babylonMesh.name + " as child to " + gltfParentNode.name, 3);
gltfParentNode.ChildrenList.Add(gltfNode.index);
}
else
{
// It's a root node
// Only root nodes are listed in a gltf scene
RaiseMessage("GLTFExporter.Mesh | Add " + babylonMesh.name + " as root node to scene", 3);
gltf.scenes[0].NodesList.Add(gltfNode.index);
}
// Transform
gltfNode.translation = babylonMesh.position;
// TODO - Choose between this method and the extra root node
// Switch from left to right handed coordinate system
//gltfNode.translation[0] *= -1;
if (babylonMesh.rotationQuaternion != null)
{
gltfNode.rotation = babylonMesh.rotationQuaternion;
}
else
{
// Convert rotation vector to quaternion
BabylonVector3 rotationVector3 = new BabylonVector3
{
X = babylonMesh.rotation[0],
Y = babylonMesh.rotation[1],
Z = babylonMesh.rotation[2]
};
gltfNode.rotation = rotationVector3.toQuaternionGltf().ToArray();
}
gltfNode.scale = babylonMesh.scaling;
// --------------------------
// --- Mesh from babylon ----
// --------------------------
if (babylonMesh.positions == null)
{
RaiseMessage("GLTFExporter.Mesh | Mesh is a dummy", 2);
return(gltfNode);
}
RaiseMessage("GLTFExporter.Mesh | Mesh from babylon", 2);
// Retreive general data from babylon mesh
int nbVertices = babylonMesh.positions.Length / 3;
bool hasUV = babylonMesh.uvs != null && babylonMesh.uvs.Length > 0;
bool hasUV2 = babylonMesh.uvs2 != null && babylonMesh.uvs2.Length > 0;
bool hasColor = babylonMesh.colors != null && babylonMesh.colors.Length > 0;
RaiseMessage("GLTFExporter.Mesh | nbVertices=" + nbVertices, 3);
RaiseMessage("GLTFExporter.Mesh | hasUV=" + hasUV, 3);
RaiseMessage("GLTFExporter.Mesh | hasUV2=" + hasUV2, 3);
RaiseMessage("GLTFExporter.Mesh | hasColor=" + hasColor, 3);
// Retreive vertices data from babylon mesh
List <GLTFGlobalVertex> globalVertices = new List <GLTFGlobalVertex>();
for (int indexVertex = 0; indexVertex < nbVertices; indexVertex++)
{
GLTFGlobalVertex globalVertex = new GLTFGlobalVertex();
globalVertex.Position = createIPoint3(babylonMesh.positions, indexVertex);
// Switch from left to right handed coordinate system
//globalVertex.Position.X *= -1;
globalVertex.Normal = createIPoint3(babylonMesh.normals, indexVertex);
if (hasUV)
{
globalVertex.UV = createIPoint2(babylonMesh.uvs, indexVertex);
// For glTF, the origin of the UV coordinates (0, 0) corresponds to the upper left corner of a texture image
// While for Babylon, it corresponds to the lower left corner of a texture image
globalVertex.UV.Y = 1 - globalVertex.UV.Y;
}
if (hasUV2)
{
globalVertex.UV2 = createIPoint2(babylonMesh.uvs2, indexVertex);
// For glTF, the origin of the UV coordinates (0, 0) corresponds to the upper left corner of a texture image
// While for Babylon, it corresponds to the lower left corner of a texture image
globalVertex.UV2.Y = 1 - globalVertex.UV2.Y;
}
if (hasColor)
{
globalVertex.Color = createIPoint4(babylonMesh.colors, indexVertex).ToArray();
}
globalVertices.Add(globalVertex);
}
// Retreive indices from babylon mesh
List <ushort> babylonIndices = new List <ushort>();
babylonIndices = babylonMesh.indices.ToList().ConvertAll(new Converter <int, ushort>(n => (ushort)n));
// For triangle primitives in gltf, the front face has a counter-clockwise (CCW) winding order
// Swap face side
//for (int i = 0; i < babylonIndices.Count; i += 3)
//{
// var tmp = babylonIndices[i];
// babylonIndices[i] = babylonIndices[i + 2];
// babylonIndices[i + 2] = tmp;
//}
// --------------------------
// ------- Init glTF --------
// --------------------------
RaiseMessage("GLTFExporter.Mesh | Init glTF", 2);
// Mesh
var gltfMesh = new GLTFMesh {
name = babylonMesh.name
};
gltfMesh.index = gltf.MeshesList.Count;
gltf.MeshesList.Add(gltfMesh);
gltfNode.mesh = gltfMesh.index;
gltfMesh.gltfNode = gltfNode;
// Buffer
var buffer = new GLTFBuffer
{
uri = gltfMesh.name + ".bin"
};
buffer.index = gltf.BuffersList.Count;
gltf.BuffersList.Add(buffer);
// BufferView - Scalar
var bufferViewScalar = new GLTFBufferView
{
name = "bufferViewScalar",
buffer = buffer.index,
Buffer = buffer
};
bufferViewScalar.index = gltf.BufferViewsList.Count;
gltf.BufferViewsList.Add(bufferViewScalar);
// BufferView - Vector3
var bufferViewFloatVec3 = new GLTFBufferView
{
name = "bufferViewFloatVec3",
buffer = buffer.index,
Buffer = buffer,
byteOffset = 0,
byteStride = 12 // Field only defined for buffer views that contain vertex attributes. A vertex needs 3 * 4 bytes
};
bufferViewFloatVec3.index = gltf.BufferViewsList.Count;
gltf.BufferViewsList.Add(bufferViewFloatVec3);
// BufferView - Vector4
GLTFBufferView bufferViewFloatVec4 = null;
if (hasColor)
{
bufferViewFloatVec4 = new GLTFBufferView
{
name = "bufferViewFloatVec4",
buffer = buffer.index,
Buffer = buffer,
byteOffset = 0,
byteStride = 16 // Field only defined for buffer views that contain vertex attributes. A vertex needs 4 * 4 bytes
};
bufferViewFloatVec4.index = gltf.BufferViewsList.Count;
gltf.BufferViewsList.Add(bufferViewFloatVec4);
}
// BufferView - Vector2
GLTFBufferView bufferViewFloatVec2 = null;
if (hasUV || hasUV2)
{
bufferViewFloatVec2 = new GLTFBufferView
{
name = "bufferViewFloatVec2",
buffer = buffer.index,
Buffer = buffer,
byteStride = 8 // Field only defined for buffer views that contain vertex attributes. A vertex needs 2 * 4 bytes
};
bufferViewFloatVec2.index = gltf.BufferViewsList.Count;
gltf.BufferViewsList.Add(bufferViewFloatVec2);
}
// --------------------------
// ---- glTF primitives -----
// --------------------------
RaiseMessage("GLTFExporter.Mesh | glTF primitives", 2);
var meshPrimitives = new List <GLTFMeshPrimitive>();
// Global vertices are sorted per submesh
var globalVerticesSubMeshes = new List <List <GLTFGlobalVertex> >();
// In gltf, indices of each mesh primitive are 0-based (ie: min value is 0)
// Thus, the gltf indices list is a concatenation of sub lists all 0-based
// Example for 2 triangles, each being a submesh:
// babylonIndices = {0,1,2, 3,4,5} gives as result gltfIndicies = {0,1,2, 0,1,2}
var gltfIndices = new List <ushort>();
foreach (BabylonSubMesh babylonSubMesh in babylonMesh.subMeshes)
{
// --------------------------
// ------ SubMesh data ------
// --------------------------
List <GLTFGlobalVertex> globalVerticesSubMesh = globalVertices.GetRange(babylonSubMesh.verticesStart, babylonSubMesh.verticesCount);
globalVerticesSubMeshes.Add(globalVerticesSubMesh);
List <ushort> _indices = babylonIndices.GetRange(babylonSubMesh.indexStart, babylonSubMesh.indexCount);
// Indices of this submesh / primitive are updated to be 0-based
var minIndiceValue = _indices.Min(); // Should be equal to babylonSubMesh.indexStart
for (int indexIndice = 0; indexIndice < _indices.Count; indexIndice++)
{
_indices[indexIndice] -= minIndiceValue;
}
gltfIndices.AddRange(_indices);
// --------------------------
// -- Init glTF primitive ---
// --------------------------
// MeshPrimitive
var meshPrimitive = new GLTFMeshPrimitive
{
attributes = new Dictionary <string, int>()
};
meshPrimitives.Add(meshPrimitive);
// Accessor - Indices
var accessorIndices = new GLTFAccessor
{
name = "accessorIndices",
bufferView = bufferViewScalar.index,
BufferView = bufferViewScalar,
componentType = GLTFAccessor.ComponentType.UNSIGNED_SHORT,
type = GLTFAccessor.TypeEnum.SCALAR.ToString()
};
accessorIndices.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorIndices);
meshPrimitive.indices = accessorIndices.index;
// Accessor - Positions
var accessorPositions = new GLTFAccessor
{
name = "accessorPositions",
bufferView = bufferViewFloatVec3.index,
BufferView = bufferViewFloatVec3,
componentType = GLTFAccessor.ComponentType.FLOAT,
type = GLTFAccessor.TypeEnum.VEC3.ToString(),
min = new float[] { float.MaxValue, float.MaxValue, float.MaxValue },
max = new float[] { float.MinValue, float.MinValue, float.MinValue }
};
accessorPositions.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorPositions);
meshPrimitive.attributes.Add(GLTFMeshPrimitive.Attribute.POSITION.ToString(), accessorPositions.index);
// Accessor - Normals
var accessorNormals = new GLTFAccessor
{
name = "accessorNormals",
bufferView = bufferViewFloatVec3.index,
BufferView = bufferViewFloatVec3,
componentType = GLTFAccessor.ComponentType.FLOAT,
type = GLTFAccessor.TypeEnum.VEC3.ToString()
};
accessorNormals.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorNormals);
meshPrimitive.attributes.Add(GLTFMeshPrimitive.Attribute.NORMAL.ToString(), accessorNormals.index);
// Accessor - Colors
GLTFAccessor accessorColors = null;
if (hasColor)
{
accessorColors = new GLTFAccessor
{
name = "accessorColors",
bufferView = bufferViewFloatVec4.index,
BufferView = bufferViewFloatVec4,
componentType = GLTFAccessor.ComponentType.FLOAT,
type = GLTFAccessor.TypeEnum.VEC4.ToString()
};
accessorColors.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorColors);
meshPrimitive.attributes.Add(GLTFMeshPrimitive.Attribute.COLOR_0.ToString(), accessorColors.index);
}
// Accessor - UV
GLTFAccessor accessorUVs = null;
if (hasUV)
{
accessorUVs = new GLTFAccessor
{
name = "accessorUVs",
bufferView = bufferViewFloatVec2.index,
BufferView = bufferViewFloatVec2,
componentType = GLTFAccessor.ComponentType.FLOAT,
type = GLTFAccessor.TypeEnum.VEC2.ToString()
};
accessorUVs.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorUVs);
meshPrimitive.attributes.Add(GLTFMeshPrimitive.Attribute.TEXCOORD_0.ToString(), accessorUVs.index);
}
// Accessor - UV2
GLTFAccessor accessorUV2s = null;
if (hasUV2)
{
accessorUV2s = new GLTFAccessor
{
name = "accessorUV2s",
bufferView = bufferViewFloatVec2.index,
BufferView = bufferViewFloatVec2,
componentType = GLTFAccessor.ComponentType.FLOAT,
type = GLTFAccessor.TypeEnum.VEC2.ToString()
};
accessorUV2s.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorUV2s);
meshPrimitive.attributes.Add(GLTFMeshPrimitive.Attribute.TEXCOORD_1.ToString(), accessorUV2s.index);
}
// --------------------------
// - Update glTF primitive --
// --------------------------
RaiseMessage("GLTFExporter.Mesh | Mesh as glTF", 3);
// Material
if (babylonMesh.materialId != null)
{
// Retreive the babylon material
var babylonMaterialId = babylonMesh.materialId;
var babylonMaterials = new List <BabylonMaterial>(babylonScene.materials);
var babylonMaterial = babylonMaterials.Find(_babylonMaterial => _babylonMaterial.id == babylonMaterialId);
if (babylonMaterial == null)
{
// It's a multi material
var babylonMultiMaterials = new List <BabylonMultiMaterial>(babylonScene.multiMaterials);
var babylonMultiMaterial = babylonMultiMaterials.Find(_babylonMultiMaterial => _babylonMultiMaterial.id == babylonMesh.materialId);
babylonMaterialId = babylonMultiMaterial.materials[babylonSubMesh.materialIndex];
babylonMaterial = babylonMaterials.Find(_babylonMaterial => _babylonMaterial.id == babylonMaterialId);
}
// Update primitive material index
var indexMaterial = babylonMaterialsToExport.FindIndex(_babylonMaterial => _babylonMaterial == babylonMaterial);
if (indexMaterial == -1)
{
// Store material for exportation
indexMaterial = babylonMaterialsToExport.Count;
babylonMaterialsToExport.Add(babylonMaterial);
}
meshPrimitive.material = indexMaterial;
// TODO - Add and retreive info from babylon material
meshPrimitive.mode = GLTFMeshPrimitive.FillMode.TRIANGLES;
}
// Update min and max vertex position for each component (X, Y, Z)
globalVerticesSubMesh.ForEach((globalVertex) =>
{
var positionArray = new float[] { globalVertex.Position.X, globalVertex.Position.Y, globalVertex.Position.Z };
for (int indexComponent = 0; indexComponent < positionArray.Length; indexComponent++)
{
if (positionArray[indexComponent] < accessorPositions.min[indexComponent])
{
accessorPositions.min[indexComponent] = positionArray[indexComponent];
}
if (positionArray[indexComponent] > accessorPositions.max[indexComponent])
{
accessorPositions.max[indexComponent] = positionArray[indexComponent];
}
}
});
// Update byte length and count of accessors, bufferViews and buffers
// Scalar
AddElementsToAccessor(accessorIndices, _indices.Count);
// Vector3
AddElementsToAccessor(accessorPositions, globalVerticesSubMesh.Count);
AddElementsToAccessor(accessorNormals, globalVerticesSubMesh.Count);
// Vector4
if (hasColor)
{
AddElementsToAccessor(accessorColors, globalVerticesSubMesh.Count);
}
// Vector2
if (hasUV)
{
AddElementsToAccessor(accessorUVs, globalVerticesSubMesh.Count);
}
if (hasUV2)
{
AddElementsToAccessor(accessorUV2s, globalVerticesSubMesh.Count);
}
}
gltfMesh.primitives = meshPrimitives.ToArray();
// Update byte offset of bufferViews
GLTFBufferView lastBufferView = null;
gltf.BufferViewsList.FindAll(bufferView => bufferView.buffer == buffer.index).ForEach(bufferView =>
{
if (lastBufferView != null)
{
bufferView.byteOffset = lastBufferView.byteOffset + lastBufferView.byteLength;
}
lastBufferView = bufferView;
});
// --------------------------
// --------- Saving ---------
// --------------------------
string outputBinaryFile = Path.Combine(gltf.OutputPath, gltfMesh.name + ".bin");
RaiseMessage("GLTFExporter.Mesh | Saving " + outputBinaryFile, 2);
// Write data to binary file
using (BinaryWriter writer = new BinaryWriter(File.Open(outputBinaryFile, FileMode.Create)))
{
// BufferView - Scalar
gltfIndices.ForEach(n => writer.Write(n));
// BufferView - Vector3
globalVerticesSubMeshes.ForEach(globalVerticesSubMesh =>
{
List <float> vertices = globalVerticesSubMesh.SelectMany(v => new[] { v.Position.X, v.Position.Y, v.Position.Z }).ToList();
vertices.ForEach(n => writer.Write(n));
List <float> normals = globalVerticesSubMesh.SelectMany(v => new[] { v.Normal.X, v.Normal.Y, v.Normal.Z }).ToList();
normals.ForEach(n => writer.Write(n));
});
// BufferView - Vector4
globalVerticesSubMeshes.ForEach(globalVerticesSubMesh =>
{
if (hasColor)
{
List <float> colors = globalVerticesSubMesh.SelectMany(v => new[] { v.Color[0], v.Color[1], v.Color[2], v.Color[3] }).ToList();
colors.ForEach(n => writer.Write(n));
}
});
// BufferView - Vector2
globalVerticesSubMeshes.ForEach(globalVerticesSubMesh =>
{
if (hasUV)
{
List <float> uvs = globalVerticesSubMesh.SelectMany(v => new[] { v.UV.X, v.UV.Y }).ToList();
uvs.ForEach(n => writer.Write(n));
}
if (hasUV2)
{
List <float> uvs2 = globalVerticesSubMesh.SelectMany(v => new[] { v.UV2.X, v.UV2.Y }).ToList();
uvs2.ForEach(n => writer.Write(n));
}
});
}
return(gltfNode);
}
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();
}
}
private GLTFMesh ExportMesh(BabylonMesh babylonMesh, GLTF gltf, GLTFNode gltfParentNode)
{
RaiseMessage("GLTFExporter.Mesh | ExportMesh babylonMesh.name=" + babylonMesh.name, 1);
// --------------------------
// ---------- Node ----------
// --------------------------
RaiseMessage("GLTFExporter.Mesh | Node", 1);
// Node
var gltfNode = new GLTFNode();
gltfNode.name = babylonMesh.name;
gltfNode.index = gltf.NodesList.Count;
gltf.NodesList.Add(gltfNode);
// Hierarchy
if (gltfParentNode != null)
{
RaiseMessage("GLTFExporter.Mesh | Add " + babylonMesh.name + " as child to " + gltfParentNode.name, 2);
gltfParentNode.ChildrenList.Add(gltfNode.index);
}
else
{
// It's a root node
// Only root nodes are listed in a gltf scene
RaiseMessage("GLTFExporter.Mesh | Add " + babylonMesh.name + " as root node to scene", 2);
gltf.scenes[0].NodesList.Add(gltfNode.index);
}
// Transform
gltfNode.translation = babylonMesh.position;
if (babylonMesh.rotationQuaternion != null)
{
gltfNode.rotation = babylonMesh.rotationQuaternion;
}
else
{
// Convert rotation vector to quaternion
// TODO - Fix it
BabylonVector3 rotationVector3 = new BabylonVector3
{
X = babylonMesh.rotation[0],
Y = babylonMesh.rotation[1],
Z = babylonMesh.rotation[2]
};
gltfNode.rotation = rotationVector3.toQuaternion().ToArray();
RaiseMessage("GLTFExporter.Mesh | rotationVector3=[" + rotationVector3.X + "; " + rotationVector3.Y + "; " + rotationVector3.Z + "]", 2);
RaiseMessage("GLTFExporter.Mesh | gltfNode.rotation=[" + gltfNode.rotation[0] + "; " + gltfNode.rotation[1] + "; " + gltfNode.rotation[2] + "; " + gltfNode.rotation[3] + "]", 2);
}
gltfNode.scale = babylonMesh.scaling;
// --------------------------
// --- Mesh from babylon ----
// --------------------------
RaiseMessage("GLTFExporter.Mesh | Mesh from babylon", 1);
// Retreive general data from babylon mesh
int nbVertices = babylonMesh.positions.Length / 3;
bool hasUV = babylonMesh.uvs != null && babylonMesh.uvs.Length > 0;
bool hasUV2 = babylonMesh.uvs2 != null && babylonMesh.uvs2.Length > 0;
bool hasColor = babylonMesh.colors != null && babylonMesh.colors.Length > 0;
RaiseMessage("GLTFExporter.Mesh | nbVertices=" + nbVertices, 2);
RaiseMessage("GLTFExporter.Mesh | hasUV=" + hasUV, 2);
RaiseMessage("GLTFExporter.Mesh | hasUV2=" + hasUV2, 2);
RaiseMessage("GLTFExporter.Mesh | hasColor=" + hasColor, 2);
// Retreive vertices data from babylon mesh
List <GLTFGlobalVertex> globalVertices = new List <GLTFGlobalVertex>();
for (int i = 0; i < nbVertices; i++)
{
GLTFGlobalVertex globalVertex = new GLTFGlobalVertex();
globalVertex.Position = createIPoint3(babylonMesh.positions, i);
globalVertex.Normal = createIPoint3(babylonMesh.normals, i);
if (hasUV)
{
globalVertex.UV = createIPoint2(babylonMesh.uvs, i);
// For glTF, the origin of the UV coordinates (0, 0) corresponds to the upper left corner of a texture image
// While for Babylon, it corresponds to the lower left corner of a texture image
globalVertex.UV.Y = 1 - globalVertex.UV.Y;
}
if (hasUV2)
{
globalVertex.UV2 = createIPoint2(babylonMesh.uvs2, i);
// For glTF, the origin of the UV coordinates (0, 0) corresponds to the upper left corner of a texture image
// While for Babylon, it corresponds to the lower left corner of a texture image
globalVertex.UV2.Y = 1 - globalVertex.UV2.Y;
}
if (hasColor)
{
globalVertex.Color = createIPoint4(babylonMesh.colors, i).ToArray();
}
globalVertices.Add(globalVertex);
}
// Retreive indices from babylon mesh
List <ushort> indices = new List <ushort>();
indices = babylonMesh.indices.ToList().ConvertAll(new Converter <int, ushort>(n => (ushort)n));
// Swap face side
for (int i = 0; i < indices.Count; i += 3)
{
var tmp = indices[i];
indices[i] = indices[i + 2];
indices[i + 2] = tmp;
}
// --------------------------
// ------- Init glTF --------
// --------------------------
RaiseMessage("GLTFExporter.Mesh | Init glTF", 1);
// Mesh
var gltfMesh = new GLTFMesh {
name = babylonMesh.name
};
gltfMesh.index = gltf.MeshesList.Count;
gltf.MeshesList.Add(gltfMesh);
gltfNode.mesh = gltfMesh.index;
gltfMesh.gltfNode = gltfNode;
// MeshPrimitive
var meshPrimitives = new List <GLTFMeshPrimitive>();
var meshPrimitive = new GLTFMeshPrimitive
{
attributes = new Dictionary <string, int>(),
mode = GLTFMeshPrimitive.FillMode.TRIANGLES // TODO reteive info from babylon material
};
meshPrimitives.Add(meshPrimitive);
// Buffer
var buffer = new GLTFBuffer
{
uri = gltfMesh.name + ".bin"
};
buffer.index = gltf.BuffersList.Count;
gltf.BuffersList.Add(buffer);
// BufferView - Scalar
var bufferViewScalar = new GLTFBufferView
{
name = "bufferViewScalar",
buffer = buffer.index,
Buffer = buffer
};
bufferViewScalar.index = gltf.BufferViewsList.Count;
gltf.BufferViewsList.Add(bufferViewScalar);
// BufferView - Vector3
var bufferViewFloatVec3 = new GLTFBufferView
{
name = "bufferViewFloatVec3",
buffer = buffer.index,
Buffer = buffer,
byteOffset = 0,
byteStride = 12 // Field only defined for buffer views that contain vertex attributes. A vertex needs 3 * 4 bytes
};
bufferViewFloatVec3.index = gltf.BufferViewsList.Count;
gltf.BufferViewsList.Add(bufferViewFloatVec3);
// Accessor - Indices
var accessorIndices = new GLTFAccessor
{
name = "accessorIndices",
bufferView = bufferViewScalar.index,
BufferView = bufferViewScalar,
componentType = GLTFAccessor.ComponentType.UNSIGNED_SHORT,
type = GLTFAccessor.TypeEnum.SCALAR.ToString()
};
accessorIndices.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorIndices);
meshPrimitive.indices = accessorIndices.index;
// Accessor - Positions
var accessorPositions = new GLTFAccessor
{
name = "accessorPositions",
bufferView = bufferViewFloatVec3.index,
BufferView = bufferViewFloatVec3,
componentType = GLTFAccessor.ComponentType.FLOAT,
type = GLTFAccessor.TypeEnum.VEC3.ToString(),
min = new float[] { float.MaxValue, float.MaxValue, float.MaxValue },
max = new float[] { float.MinValue, float.MinValue, float.MinValue }
};
accessorPositions.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorPositions);
meshPrimitive.attributes.Add(GLTFMeshPrimitive.Attribute.POSITION.ToString(), accessorPositions.index);
// Accessor - Normals
var accessorNormals = new GLTFAccessor
{
name = "accessorNormals",
bufferView = bufferViewFloatVec3.index,
BufferView = bufferViewFloatVec3,
componentType = GLTFAccessor.ComponentType.FLOAT,
type = GLTFAccessor.TypeEnum.VEC3.ToString()
};
accessorNormals.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorNormals);
meshPrimitive.attributes.Add(GLTFMeshPrimitive.Attribute.NORMAL.ToString(), accessorNormals.index);
// BufferView - Vector4
GLTFBufferView bufferViewFloatVec4 = null;
// Accessor - Colors
GLTFAccessor accessorColors = null;
if (hasColor)
{
bufferViewFloatVec4 = new GLTFBufferView
{
name = "bufferViewFloatVec4",
buffer = buffer.index,
Buffer = buffer,
byteOffset = 0,
byteStride = 16 // Field only defined for buffer views that contain vertex attributes. A vertex needs 4 * 4 bytes
};
bufferViewFloatVec4.index = gltf.BufferViewsList.Count;
gltf.BufferViewsList.Add(bufferViewFloatVec4);
accessorColors = new GLTFAccessor
{
name = "accessorColors",
bufferView = bufferViewFloatVec4.index,
BufferView = bufferViewFloatVec4,
componentType = GLTFAccessor.ComponentType.FLOAT,
type = GLTFAccessor.TypeEnum.VEC4.ToString()
};
accessorColors.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorColors);
meshPrimitive.attributes.Add(GLTFMeshPrimitive.Attribute.COLOR_0.ToString(), accessorColors.index);
}
// BufferView - Vector2
GLTFBufferView bufferViewFloatVec2 = null;
if (hasUV || hasUV2)
{
bufferViewFloatVec2 = new GLTFBufferView
{
name = "bufferViewFloatVec2",
buffer = buffer.index,
Buffer = buffer,
byteStride = 8 // Field only defined for buffer views that contain vertex attributes. A vertex needs 2 * 4 bytes
};
bufferViewFloatVec2.index = gltf.BufferViewsList.Count;
gltf.BufferViewsList.Add(bufferViewFloatVec2);
}
// Accessor - UV
GLTFAccessor accessorUVs = null;
if (hasUV)
{
accessorUVs = new GLTFAccessor
{
name = "accessorUVs",
bufferView = bufferViewFloatVec2.index,
BufferView = bufferViewFloatVec2,
componentType = GLTFAccessor.ComponentType.FLOAT,
type = GLTFAccessor.TypeEnum.VEC2.ToString()
};
accessorUVs.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorUVs);
meshPrimitive.attributes.Add(GLTFMeshPrimitive.Attribute.TEXCOORD_0.ToString(), accessorUVs.index);
}
// Accessor - UV2
GLTFAccessor accessorUV2s = null;
if (hasUV2)
{
accessorUV2s = new GLTFAccessor
{
name = "accessorUV2s",
bufferView = bufferViewFloatVec2.index,
BufferView = bufferViewFloatVec2,
componentType = GLTFAccessor.ComponentType.FLOAT,
type = GLTFAccessor.TypeEnum.VEC2.ToString()
};
accessorUV2s.index = gltf.AccessorsList.Count;
gltf.AccessorsList.Add(accessorUV2s);
meshPrimitive.attributes.Add(GLTFMeshPrimitive.Attribute.TEXCOORD_1.ToString(), accessorUV2s.index);
}
// --------------------------
// ------ Mesh as glTF ------
// --------------------------
RaiseMessage("GLTFExporter.Mesh | Mesh as glTF", 1);
// Material
//TODO - Handle multimaterials
GLTFMaterial gltfMaterial = gltf.MaterialsList.Find(material => material.id == babylonMesh.materialId);
if (gltfMaterial != null)
{
meshPrimitive.material = gltfMaterial.index;
}
// Update min and max vertex position for each component (X, Y, Z)
globalVertices.ForEach((globalVertex) =>
{
var positionArray = new float[] { globalVertex.Position.X, globalVertex.Position.Y, globalVertex.Position.Z };
for (int indexComponent = 0; indexComponent < positionArray.Length; indexComponent++)
{
if (positionArray[indexComponent] < accessorPositions.min[indexComponent])
{
accessorPositions.min[indexComponent] = positionArray[indexComponent];
}
if (positionArray[indexComponent] > accessorPositions.max[indexComponent])
{
accessorPositions.max[indexComponent] = positionArray[indexComponent];
}
}
});
// Update byte length and count of accessors, bufferViews and buffers
// Scalar
AddElementsToAccessor(accessorIndices, indices.Count);
// Vector3
bufferViewFloatVec3.byteOffset = buffer.byteLength;
AddElementsToAccessor(accessorPositions, globalVertices.Count);
AddElementsToAccessor(accessorNormals, globalVertices.Count);
// Vector4
if (hasColor)
{
bufferViewFloatVec4.byteOffset = buffer.byteLength;
AddElementsToAccessor(accessorColors, globalVertices.Count);
}
// Vector2
if (hasUV || hasUV2)
{
bufferViewFloatVec2.byteOffset = buffer.byteLength;
if (hasUV)
{
AddElementsToAccessor(accessorUVs, globalVertices.Count);
}
if (hasUV2)
{
AddElementsToAccessor(accessorUV2s, globalVertices.Count);
}
}
// --------------------------
// --------- Saving ---------
// --------------------------
string outputBinaryFile = Path.Combine(gltf.OutputPath, gltfMesh.name + ".bin");
RaiseMessage("GLTFExporter.Mesh | Saving " + outputBinaryFile, 1);
using (BinaryWriter writer = new BinaryWriter(File.Open(outputBinaryFile, FileMode.Create)))
{
// Binary arrays
List <float> vertices = globalVertices.SelectMany(v => new[] { v.Position.X, v.Position.Y, v.Position.Z }).ToList();
List <float> normals = globalVertices.SelectMany(v => new[] { v.Normal.X, v.Normal.Y, v.Normal.Z }).ToList();
List <float> colors = new List <float>();
if (hasColor)
{
colors = globalVertices.SelectMany(v => new[] { v.Color[0], v.Color[1], v.Color[2], v.Color[3] }).ToList();
}
List <float> uvs = new List <float>();
if (hasUV)
{
uvs = globalVertices.SelectMany(v => new[] { v.UV.X, v.UV.Y }).ToList(); // No symetry required to perform 3dsMax => gltf conversion
}
List <float> uvs2 = new List <float>();
if (hasUV2)
{
uvs2 = globalVertices.SelectMany(v => new[] { v.UV2.X, v.UV2.Y }).ToList(); // No symetry required to perform 3dsMax => gltf conversion
}
// Write data to binary file
indices.ForEach(n => writer.Write(n));
vertices.ForEach(n => writer.Write(n));
normals.ForEach(n => writer.Write(n));
colors.ForEach(n => writer.Write(n));
uvs.ForEach(n => writer.Write(n));
}
gltfMesh.primitives = meshPrimitives.ToArray();
return(gltfMesh);
}
