/// <summary>
/// Takes the intermediate geometry data and performs the calculations
/// to convert that into glTF buffers, views, and accessors.
/// </summary>
/// <param name="geomData"></param>
/// <param name="name">Unique name for the .bin file that will be produced.</param>
/// <param name="elementId">Revit element's Element ID that will be used as the batchId value.</param>
/// <returns></returns>
public glTFBinaryData AddGeometryMeta(GeometryData geomData, string name, int elementId)
{
// add a buffer
glTFBuffer buffer = new glTFBuffer();
buffer.uri = name + ".bin";
Buffers.Add(buffer);
int bufferIdx = Buffers.Count - 1;
/**
* Buffer Data
**/
glTFBinaryData bufferData = new glTFBinaryData();
bufferData.name = buffer.uri;
foreach (var coord in geomData.vertices)
{
float vFloat = Convert.ToSingle(coord);
bufferData.vertexBuffer.Add(vFloat);
}
//foreach (var normal in geomData.normals)
//{
// bufferData.normalBuffer.Add((float)normal);
//}
foreach (var index in geomData.faces)
{
bufferData.indexBuffer.Add(index);
}
foreach (var coord in geomData.vertices)
{
bufferData.batchIdBuffer.Add(elementId);
}
// Get max and min for vertex data
float[] vertexMinMax = Util.GetVec3MinMax(bufferData.vertexBuffer);
// Get max and min for normal data
//float[] normalMinMax = Util.GetVec3MinMax(bufferData.normalBuffer);
// Get max and min for index data
int[] faceMinMax = Util.GetScalarMinMax(bufferData.indexBuffer);
// Get max and min for batchId data
float[] batchIdMinMax = Util.GetVec3MinMax(bufferData.batchIdBuffer);
/**
* BufferViews
**/
// Add a vec3 buffer view
int elementsPerVertex = 3;
int bytesPerElement = 4;
int bytesPerVertex = elementsPerVertex * bytesPerElement;
int numVec3 = (geomData.vertices.Count) / elementsPerVertex;
int sizeOfVec3View = numVec3 * bytesPerVertex;
glTFBufferView vec3View = new glTFBufferView();
vec3View.buffer = bufferIdx;
vec3View.byteOffset = 0;
vec3View.byteLength = sizeOfVec3View;
vec3View.target = Targets.ARRAY_BUFFER;
BufferViews.Add(vec3View);
int vec3ViewIdx = BufferViews.Count - 1;
// Add a normals (vec3) buffer view
//int elementsPerNormal = 3;
//int bytesPerNormalElement = 4;
//int bytesPerNormal = elementsPerNormal * bytesPerNormalElement;
//int numVec3Normals = (geomData.normals.Count) / elementsPerNormal;
//int sizeOfVec3ViewNormals = numVec3Normals * bytesPerNormal;
//glTFBufferView vec3ViewNormals = new glTFBufferView();
//vec3ViewNormals.buffer = bufferIdx;
//vec3ViewNormals.byteOffset = vec3View.byteLength;
//vec3ViewNormals.byteLength = sizeOfVec3ViewNormals;
//vec3ViewNormals.target = Targets.ELEMENT_ARRAY_BUFFER;
//BufferViews.Add(vec3ViewNormals);
//int vec3ViewNormalsIdx = BufferViews.Count - 1;
// Add a faces / indexes buffer view
int elementsPerIndex = 1;
int bytesPerIndexElement = 4;
int bytesPerIndex = elementsPerIndex * bytesPerIndexElement;
int numIndexes = geomData.faces.Count;
int sizeOfIndexView = numIndexes * bytesPerIndex;
glTFBufferView facesView = new glTFBufferView();
facesView.buffer = bufferIdx;
facesView.byteOffset = vec3View.byteLength;
//facesView.byteOffset = vec3ViewNormals.byteOffset + vec3ViewNormals.byteLength;
facesView.byteLength = sizeOfIndexView;
facesView.target = Targets.ELEMENT_ARRAY_BUFFER;
BufferViews.Add(facesView);
int facesViewIdx = BufferViews.Count - 1;
// Add a batchId buffer view
glTFBufferView batchIdsView = new glTFBufferView();
batchIdsView.buffer = bufferIdx;
batchIdsView.byteOffset = facesView.byteOffset + facesView.byteLength;
batchIdsView.byteLength = sizeOfVec3View;
batchIdsView.target = Targets.ARRAY_BUFFER;
BufferViews.Add(batchIdsView);
int batchIdsViewIdx = BufferViews.Count - 1;
//Buffers[bufferIdx].byteLength = vec3View.byteLength + vec3ViewNormals.byteLength + facesView.byteLength + batchIdsView.byteLength;
Buffers[bufferIdx].byteLength = vec3View.byteLength + facesView.byteLength + batchIdsView.byteLength;
/**
* Accessors
**/
// add a position accessor
glTFAccessor positionAccessor = new glTFAccessor();
positionAccessor.bufferView = vec3ViewIdx;
positionAccessor.byteOffset = 0;
positionAccessor.componentType = ComponentType.FLOAT;
positionAccessor.count = geomData.vertices.Count / elementsPerVertex;
positionAccessor.type = "VEC3";
positionAccessor.max = new List <float>()
{
vertexMinMax[1], vertexMinMax[3], vertexMinMax[5]
};
positionAccessor.min = new List <float>()
{
vertexMinMax[0], vertexMinMax[2], vertexMinMax[4]
};
positionAccessor.name = "POSITION";
Accessors.Add(positionAccessor);
bufferData.vertexAccessorIndex = Accessors.Count - 1;
//add a normals accessor
//glTFAccessor normalsAccessor = new glTFAccessor();
//normalsAccessor.bufferView = vec3ViewNormalsIdx;
//normalsAccessor.byteOffset = 0;
//normalsAccessor.componentType = ComponentType.FLOAT;
//normalsAccessor.count = geomData.normals.Count / elementsPerNormal;
//normalsAccessor.type = "VEC3";
//normalsAccessor.max = new List<float>() { normalMinMax[1], normalMinMax[3], normalMinMax[5] };
//normalsAccessor.min = new List<float>() { normalMinMax[0], normalMinMax[2], normalMinMax[4] };
//normalsAccessor.name = "NORMALS";
//Accessors.Add(normalsAccessor);
//bufferData.normalsAccessorIndex = Accessors.Count - 1;
// add a face accessor
glTFAccessor faceAccessor = new glTFAccessor();
faceAccessor.bufferView = facesViewIdx;
faceAccessor.byteOffset = 0;
faceAccessor.componentType = ComponentType.UNSIGNED_INT;
//faceAccessor.count = numIndexes;
faceAccessor.count = geomData.faces.Count / elementsPerIndex;
faceAccessor.type = "SCALAR";
faceAccessor.max = new List <float>()
{
faceMinMax[1]
};
faceAccessor.min = new List <float>()
{
faceMinMax[0]
};
faceAccessor.name = "FACE";
Accessors.Add(faceAccessor);
bufferData.indexAccessorIndex = Accessors.Count - 1;
// add a batchId accessor
glTFAccessor batchIdAccessor = new glTFAccessor();
batchIdAccessor.bufferView = batchIdsViewIdx;
batchIdAccessor.byteOffset = 0;
batchIdAccessor.componentType = ComponentType.FLOAT;
//batchIdAccessor.count = numIndexes;
batchIdAccessor.count = geomData.vertices.Count / elementsPerVertex;
batchIdAccessor.type = "VEC3";
//batchIdAccessor.max = new List<float>() { batchIdMinMax[1] };
//batchIdAccessor.min = new List<float>() { batchIdMinMax[0] };
batchIdAccessor.max = new List <float>()
{
batchIdMinMax[1], batchIdMinMax[3], batchIdMinMax[5]
};
batchIdAccessor.min = new List <float>()
{
batchIdMinMax[0], batchIdMinMax[2], batchIdMinMax[4]
};
batchIdAccessor.name = "BATCH_ID";
Accessors.Add(batchIdAccessor);
bufferData.batchIdAccessorIndex = Accessors.Count - 1;
return(bufferData);
}
/// <summary>
/// Runs once at end of export. Serializes the gltf
/// properties and wites out the *.gltf and *.bin files.
/// </summary>
public void Finish()
{
Debug.WriteLine("Finishing...");
// TODO: [RM] Standardize what non glTF spec elements will go into
// this "BIM glTF superset" and write a spec for it. Gridlines below
// are an example.
// Add gridlines as gltf nodes in the format:
// Origin {Vec3<double>}, Direction {Vec3<double>}, Length {double}
FilteredElementCollector col = new FilteredElementCollector(_doc)
.OfClass(typeof(Grid));
var grids = col.ToElements();
foreach (Grid g in grids)
{
Line l = g.Curve as Line;
var origin = l.Origin;
var direction = l.Direction;
var length = l.Length;
var xtras = new glTFExtras();
var grid = new GridParameters();
grid.origin = new List <double>()
{
origin.X, origin.Y, origin.Z
};
grid.direction = new List <double>()
{
direction.X, direction.Y, direction.Z
};
grid.length = length;
xtras.GridParameters = grid;
xtras.UniqueId = g.UniqueId;
xtras.parameters = Util.GetElementParameters(g, true);
var gridNode = new glTFNode();
gridNode.name = g.Name;
gridNode.extras = xtras;
Nodes.AddOrUpdateCurrent(g.UniqueId, gridNode);
rootNode.children.Add(Nodes.CurrentIndex);
}
if (_singleBinary)
{
int bytePosition = 0;
int currentBuffer = 0;
foreach (var view in BufferViews)
{
if (view.buffer == 0)
{
bytePosition += view.byteLength;
continue;
}
if (view.buffer != currentBuffer)
{
view.buffer = 0;
view.byteOffset = bytePosition;
bytePosition += view.byteLength;
}
}
glTFBuffer buffer = new glTFBuffer();
buffer.uri = "monobuffer.bin";
buffer.byteLength = bytePosition;
Buffers.Clear();
Buffers.Add(buffer);
using (FileStream f = File.Create(_directory + "monobuffer.bin"))
{
using (BinaryWriter writer = new BinaryWriter(f))
{
foreach (var bin in binaryFileData)
{
foreach (var coord in bin.vertexBuffer)
{
writer.Write((float)coord);
}
//foreach (var normal in bin.normalBuffer)
//{
// writer.Write((float)normal);
//}
foreach (var index in bin.indexBuffer)
{
writer.Write((int)index);
}
foreach (var batchId in bin.batchIdBuffer)
{
writer.Write((float)batchId);
}
}
}
}
}
// Package the properties into a serializable container
glTF model = new glTF();
model.asset = new glTFVersion();
model.scenes = Scenes;
model.nodes = Nodes.List;
model.meshes = Meshes.List;
model.materials = Materials.List;
model.buffers = Buffers;
model.bufferViews = BufferViews;
model.accessors = Accessors;
// Write the *.gltf file
string serializedModel = JsonConvert.SerializeObject(model, new JsonSerializerSettings {
NullValueHandling = NullValueHandling.Ignore
});
File.WriteAllText(_filename, serializedModel);
if (!_singleBinary)
{
// Write the *.bin files
foreach (var bin in binaryFileData)
{
using (FileStream f = File.Create(_directory + bin.name))
{
using (BinaryWriter writer = new BinaryWriter(f))
{
foreach (var coord in bin.vertexBuffer)
{
writer.Write((float)coord);
}
//foreach (var normal in bin.normalBuffer)
//{
// writer.Write((float)normal);
//}
foreach (var index in bin.indexBuffer)
{
writer.Write((int)index);
}
foreach (var batchId in bin.batchIdBuffer)
{
writer.Write((float)batchId);
}
}
}
}
}
}