public static Lib3dsFile Export(List <Group> groups, List <Lib3dsVertex> vertices, List <ushort[]> allFaces, short[] faceGroupIds)
{
var file = LIB3DS.lib3ds_file_new();
var textureGroups = new Dictionary <int, List <Group> >();
foreach (var group in groups)
{
var groupId = (int)group[ModelField.TextureGroup];
if (groupId == -1 || !textureGroups.TryGetValue(groupId, out var textureGroup))
{
textureGroup = new List <Group>();
if (groupId != -1)
{
textureGroups.Add(groupId, textureGroup);
}
}
textureGroup.Add(group);
group.TextureGroup = textureGroup;
// TODO: Hierarchy of object
var node = LIB3DS.lib3ds_node_new(Lib3dsNodeType.LIB3DS_NODE_MESH_INSTANCE);
node.name = group[ModelField.GroupName].ToString();
node.node_id = (ushort)file.nodes.Count;
file.nodes.Add(node);
}
var objectIndices = (faceGroupIds == null ? Enumerable.Range(0, groups.Count) :
faceGroupIds.Distinct().Select(b => (int)b)).ToArray();
MaterialExporter.Export(groups, file);
var facesByObject = TriangleExporter.Export(allFaces, faceGroupIds, objectIndices);
foreach (var i in objectIndices)
{
var group = groups[i];
var faces = facesByObject[i];
var mesh = LIB3DS.lib3ds_mesh_new(group[ModelField.GroupName].ToString());
mesh.vertices = vertices;
mesh.nvertices = (ushort)vertices.Count;
mesh.texcos = new List <Lib3dsTexturecoordinate>();
file.meshes.Add(mesh);
if (faces.Count != 0)
{
var usedVertices = group.TextureGroup
.Select(g => groups.IndexOf(g))
.SelectMany(g => facesByObject[g])
.SelectMany(f => f.index)
.Distinct()
.Select(v => vertices[v])
.ToArray();
var minX = usedVertices.Min(v => v.x);
var minY = usedVertices.Min(v => v.y);
var minZ = usedVertices.Min(v => v.z);
var maxX = usedVertices.Max(v => v.x);
var maxY = usedVertices.Max(v => v.y);
var maxZ = usedVertices.Max(v => v.z);
var objectMin = new Vector3(minX, minY, minZ);
var objectScale = new Vector3(maxX - minX, maxY - minY, maxZ - minZ);
if (objectScale.X < 0.001f)
{
objectScale.X = 1;
}
if (objectScale.Y < 0.001f)
{
objectScale.Y = 1;
}
if (objectScale.Z < 0.001f)
{
objectScale.Z = 1;
}
var quaternionX = Quaternion.CreateFromYawPitchRoll(0, -(float)group[ModelField.TextureRotateX], 0);
var quaternionY = Quaternion.CreateFromYawPitchRoll(-(float)group[ModelField.TextureRotateY], 0, 0);
var quaternionZ = Quaternion.CreateFromYawPitchRoll(0, 0, -(float)group[ModelField.TextureRotateZ]);
var quaternion = Quaternion.Multiply(quaternionX, quaternionY);
var rotation = Matrix4x4.CreateFromQuaternion(Quaternion.Multiply(quaternion, quaternionZ));
for (int v = 0; v < vertices.Count; v++)
{
var vector = new Vector3(vertices[v].x, vertices[v].y, vertices[v].z);
vector -= objectMin;
vector /= objectScale;
vector = Vector3.Transform(vector, rotation);
mesh.texcos.Add(new Lib3dsTexturecoordinate(vector.X, vector.Y));
}
foreach (var face in faces)
{
face.material = i;
}
mesh.faces = faces;
mesh.nfaces = (ushort)faces.Count;
}
}
return(file);
}
