protected virtual void BuildMeshAttributes(GLTF.Schema.MeshPrimitive primitive, int meshID, int primitiveIndex)
{
if (_assetCache.MeshCache[meshID][primitiveIndex].MeshAttributes.Count == 0)
{
Dictionary <string, AttributeAccessor> attributeAccessors = new Dictionary <string, AttributeAccessor>(primitive.Attributes.Count + 1);
foreach (var attributePair in primitive.Attributes)
{
AttributeAccessor AttributeAccessor = new AttributeAccessor()
{
AccessorId = attributePair.Value,
Buffer = _assetCache.BufferCache[attributePair.Value.Value.BufferView.Value.Buffer.Id]
};
attributeAccessors[attributePair.Key] = AttributeAccessor;
}
if (primitive.Indices != null)
{
AttributeAccessor indexBuilder = new AttributeAccessor()
{
AccessorId = primitive.Indices,
Buffer = _assetCache.BufferCache[primitive.Indices.Value.BufferView.Value.Buffer.Id]
};
attributeAccessors[GLTF.Schema.SemanticProperties.INDICES] = indexBuilder;
}
GLTFHelpers.BuildMeshAttributes(ref attributeAccessors);
_assetCache.MeshCache[meshID][primitiveIndex].MeshAttributes = attributeAccessors;
}
}
private void parseAttribute(ref GLTF.Schema.MeshPrimitive prim, string property, ref Vector4[] values)
{
byte[] bufferData = _assetCache.BufferCache[prim.Attributes[property].Value.BufferView.Value.Buffer.Id];
NumericArray num = new NumericArray();
GLTF.Math.Vector4[] gltfValues = prim.Attributes[property].Value.AsVector4Array(ref num, bufferData);
values = new Vector4[gltfValues.Length];
for (int i = 0; i < gltfValues.Length; ++i)
{
values[i] = gltfValues[i].ToUnityVector4();
}
}
protected virtual void LoadSkinnedMeshAttributes(int meshIndex, int primitiveIndex, ref Vector4[] boneIndexes, ref Vector4[] weights)
{
GLTF.Schema.MeshPrimitive prim = _root.Meshes[meshIndex].Primitives[primitiveIndex];
if (!prim.Attributes.ContainsKey(SemanticProperties.JOINT) || !prim.Attributes.ContainsKey(SemanticProperties.WEIGHT))
{
return;
}
parseAttribute(ref prim, SemanticProperties.JOINT, ref boneIndexes);
parseAttribute(ref prim, SemanticProperties.WEIGHT, ref weights);
foreach (Vector4 wei in weights)
{
wei.Normalize();
}
}
// Taken from: http://answers.unity3d.com/comments/190515/view.html
// Official support for Mesh.RecalculateTangents should be coming in 5.6
// https://feedback.unity3d.com/suggestions/recalculatetangents
/*private MeshPrimitiveAttributes CalculateAndSetTangents(MeshPrimitiveAttributes attributes)
* {
* var triangleCount = attributes.Triangles.Length;
* var vertexCount = attributes.Vertices.Length;
*
* var tan1 = new Vector3[vertexCount];
* var tan2 = new Vector3[vertexCount];
*
* attributes.Tangents = new Vector4[vertexCount];
*
* for (long a = 0; a < triangleCount; a += 3)
* {
* long i1 = attributes.Triangles[a + 0];
* long i2 = attributes.Triangles[a + 1];
* long i3 = attributes.Triangles[a + 2];
*
* var v1 = attributes.Vertices[i1];
* var v2 = attributes.Vertices[i2];
* var v3 = attributes.Vertices[i3];
*
* var w1 = attributes.Uv[i1];
* var w2 = attributes.Uv[i2];
* var w3 = attributes.Uv[i3];
*
* var x1 = v2.X - v1.X;
* var x2 = v3.X - v1.X;
* var y1 = v2.Y - v1.Y;
* var y2 = v3.Y - v1.Y;
* var z1 = v2.Z - v1.Z;
* var z2 = v3.Z - v1.Z;
*
* var s1 = w2.X - w1.X;
* var s2 = w3.X - w1.X;
* var t1 = w2.Y - w1.Y;
* var t2 = w3.Y - w1.Y;
*
* var r = 1.0f / (s1 * t2 - s2 * t1);
*
* var sdir = new Vector3((t2 * x1 - t1 * x2) * r, (t2 * y1 - t1 * y2) * r, (t2 * z1 - t1 * z2) * r);
* var tdir = new Vector3((s1 * x2 - s2 * x1) * r, (s1 * y2 - s2 * y1) * r, (s1 * z2 - s2 * z1) * r);
*
* tan1[i1] += sdir;
* tan1[i2] += sdir;
* tan1[i3] += sdir;
*
* tan2[i1] += tdir;
* tan2[i2] += tdir;
* tan2[i3] += tdir;
* }
*
*
* for (long a = 0; a < vertexCount; ++a)
* {
* var n = attributes.Normals[a];
* var t = tan1[a];
*
* Vector3.OrthoNormalize(ref n, ref t);
*
* attributes.Tangents[a].X = t.X;
* attributes.Tangents[a].Y = t.Y;
* attributes.Tangents[a].Z = t.Z;
*
* attributes.Tangents[a].W = (Vector3.Dot(Vector3.Cross(n, t), tan2[a]) < 0.0f) ? -1.0f : 1.0f;
* }
*
* return attributes;
* }*/
public static MeshPrimitive Deserialize(GLTFRoot root, JsonReader reader)
{
var primitive = new MeshPrimitive();
while (reader.Read() && reader.TokenType == JsonToken.PropertyName)
{
var curProp = reader.Value.ToString();
switch (curProp)
{
case "attributes":
primitive.Attributes = reader.ReadAsDictionary(() => new AccessorId
{
Id = reader.ReadAsInt32().Value,
Root = root
});
break;
case "indices":
primitive.Indices = AccessorId.Deserialize(root, reader);
break;
case "material":
primitive.Material = MaterialId.Deserialize(root, reader);
break;
case "mode":
primitive.Mode = (DrawMode)reader.ReadAsInt32().Value;
break;
case "targets":
primitive.Targets = reader.ReadList(() =>
{
return(reader.ReadAsDictionary(() => new AccessorId
{
Id = reader.ReadAsInt32().Value,
Root = root
},
skipStartObjectRead: true));
});
break;
case "extras":
// GLTF does not support morph target names, serialize in extras for now
// https://github.com/KhronosGroup/glTF/issues/1036
if (reader.Read() && reader.TokenType == JsonToken.StartObject)
{
while (reader.Read() && reader.TokenType == JsonToken.PropertyName)
{
var extraProperty = reader.Value.ToString();
switch (extraProperty)
{
case "targetNames":
primitive.TargetNames = reader.ReadStringList();
break;
}
}
}
break;
default:
primitive.DefaultPropertyDeserializer(root, reader);
break;
}
}
return(primitive);
}
protected virtual GameObject CreateMeshPrimitive(GLTF.Schema.MeshPrimitive primitive, int meshID, int primitiveIndex)
{
var primitiveObj = new GameObject("Primitive");
var meshFilter = primitiveObj.AddComponent <MeshFilter>();
if (_assetCache.MeshCache[meshID][primitiveIndex] == null)
{
_assetCache.MeshCache[meshID][primitiveIndex] = new MeshCacheData();
}
if (_assetCache.MeshCache[meshID][primitiveIndex].LoadedMesh == null)
{
if (_assetCache.MeshCache[meshID][primitiveIndex].MeshAttributes.Count == 0)
{
BuildMeshAttributes(primitive, meshID, primitiveIndex);
}
var meshAttributes = _assetCache.MeshCache[meshID][primitiveIndex].MeshAttributes;
var vertexCount = primitive.Attributes[GLTF.Schema.SemanticProperties.POSITION].Value.Count;
// todo optimize: There are multiple copies being performed to turn the buffer data into mesh data. Look into reducing them
UnityEngine.Mesh mesh = new UnityEngine.Mesh
{
vertices = primitive.Attributes.ContainsKey(GLTF.Schema.SemanticProperties.POSITION)
? meshAttributes[GLTF.Schema.SemanticProperties.POSITION].AccessorContent.AsVertices.ToUnityVector3()
: null,
normals = primitive.Attributes.ContainsKey(GLTF.Schema.SemanticProperties.NORMAL)
? meshAttributes[GLTF.Schema.SemanticProperties.NORMAL].AccessorContent.AsNormals.ToUnityVector3()
: null,
uv = primitive.Attributes.ContainsKey(GLTF.Schema.SemanticProperties.TexCoord(0))
? meshAttributes[GLTF.Schema.SemanticProperties.TexCoord(0)].AccessorContent.AsTexcoords.ToUnityVector2()
: null,
uv2 = primitive.Attributes.ContainsKey(GLTF.Schema.SemanticProperties.TexCoord(1))
? meshAttributes[GLTF.Schema.SemanticProperties.TexCoord(1)].AccessorContent.AsTexcoords.ToUnityVector2()
: null,
uv3 = primitive.Attributes.ContainsKey(GLTF.Schema.SemanticProperties.TexCoord(2))
? meshAttributes[GLTF.Schema.SemanticProperties.TexCoord(2)].AccessorContent.AsTexcoords.ToUnityVector2()
: null,
uv4 = primitive.Attributes.ContainsKey(GLTF.Schema.SemanticProperties.TexCoord(3))
? meshAttributes[GLTF.Schema.SemanticProperties.TexCoord(3)].AccessorContent.AsTexcoords.ToUnityVector2()
: null,
colors = primitive.Attributes.ContainsKey(GLTF.Schema.SemanticProperties.Color(0))
? meshAttributes[GLTF.Schema.SemanticProperties.Color(0)].AccessorContent.AsColors.ToUnityColor()
: null,
triangles = primitive.Indices != null
? meshAttributes[GLTF.Schema.SemanticProperties.INDICES].AccessorContent.AsTriangles
: GLTF.Schema.MeshPrimitive.GenerateTriangles(vertexCount),
tangents = primitive.Attributes.ContainsKey(GLTF.Schema.SemanticProperties.TANGENT)
? meshAttributes[GLTF.Schema.SemanticProperties.TANGENT].AccessorContent.AsTangents.ToUnityVector4()
: null
};
_assetCache.MeshCache[meshID][primitiveIndex].LoadedMesh = mesh;
}
meshFilter.sharedMesh = _assetCache.MeshCache[meshID][primitiveIndex].LoadedMesh;
var materialWrapper = CreateMaterial(
primitive.Material != null ? primitive.Material.Value : DefaultMaterial,
primitive.Material != null ? primitive.Material.Id : -1
);
var meshRenderer = primitiveObj.AddComponent <MeshRenderer>();
meshRenderer.material = materialWrapper.GetContents(primitive.Attributes.ContainsKey(GLTF.Schema.SemanticProperties.Color(0)));
if (_addColliders)
{
var meshCollider = primitiveObj.AddComponent <MeshCollider>();
meshCollider.sharedMesh = meshFilter.mesh;
}
return(primitiveObj);
}
