// 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;
default:
primitive.DefaultPropertyDeserializer(root, reader);
break;
}
}
return(primitive);
}
// 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);
}