private static Gltf InitializeGlTF(Model model, List <byte> buffer, bool drawEdges = false)
{
var gltf = new Gltf();
var asset = new Asset();
asset.Version = "2.0";
asset.Generator = "hypar-gltf";
gltf.Asset = asset;
var root = new Node();
var rootTransform = new Transform(model.Transform);
// Rotate the transform for +Z up.
rootTransform.Rotate(new Vector3(1, 0, 0), -90.0);
var m = rootTransform.Matrix;
root.Matrix = new float[] {
(float)m.m11, (float)m.m12, (float)m.m13, 0f,
(float)m.m21, (float)m.m22, (float)m.m23, 0f,
(float)m.m31, (float)m.m32, (float)m.m33, 0f,
(float)m.tx, (float)m.ty, (float)m.tz, 1f
};
var nodes = new List <glTFLoader.Schema.Node> {
root
};
var meshes = new List <glTFLoader.Schema.Mesh>();
gltf.Scene = 0;
var scene = new Scene();
scene.Nodes = new[] { 0 };
gltf.Scenes = new[] { scene };
gltf.ExtensionsUsed = new[] {
"KHR_materials_pbrSpecularGlossiness",
"KHR_materials_unlit",
"KHR_lights_punctual"
};
var bufferViews = new List <BufferView>();
var accessors = new List <Accessor>();
var materialsToAdd = model.AllElementsOfType <Material>().ToList();
if (drawEdges)
{
materialsToAdd.Add(BuiltInMaterials.Edges);
}
var materials = gltf.AddMaterials(materialsToAdd, buffer, bufferViews);
var elements = model.Elements.Where(e =>
{
return(e.Value is GeometricElement || e.Value is ElementInstance);
}).Select(e => e.Value).ToList();
var lights = model.AllElementsOfType <DirectionalLight>().ToList();
gltf.AddLights(lights, nodes);
// Lines are stored in a list of lists
// according to the max available index size.
var lines = new List <List <Vector3> >();
var currLines = new List <Vector3>();
lines.Add(currLines);
var meshElementMap = new Dictionary <Guid, List <int> >();
foreach (var e in elements)
{
// Check if we'll overrun the index size
// for the current line array. If so,
// create a new line array.
if (currLines.Count * 2 > ushort.MaxValue)
{
currLines = new List <Vector3>();
lines.Add(currLines);
}
GetRenderDataForElement(e,
gltf,
materials,
buffer,
bufferViews,
accessors,
meshes,
nodes,
meshElementMap,
currLines,
drawEdges);
}
if (buffer.Count == 0 && lights.Count == 0)
{
return(null);
}
if (drawEdges && lines.Count() > 0)
{
foreach (var lineSet in lines)
{
if (lineSet.Count == 0)
{
continue;
}
AddLines(GetNextId(), lineSet, gltf, materials[BuiltInMaterials.Edges.Name], buffer, bufferViews, accessors, meshes, nodes, false);
}
}
var buff = new glTFLoader.Schema.Buffer();
buff.ByteLength = buffer.Count;
gltf.Buffers = new[] { buff };
gltf.BufferViews = bufferViews.ToArray();
gltf.Accessors = accessors.ToArray();
gltf.Nodes = nodes.ToArray();
if (meshes.Count > 0)
{
gltf.Meshes = meshes.ToArray();
}
return(gltf);
}