private static void MergeMeshes(Kn5Node root, List <Tuple <Kn5Node, double, Mat4x4> > children, CarLodGeneratorMergeRules mergeRules,
CarLodGeneratorStageParams stage)
{
if (children.Count == 0)
{
return;
}
var mesh = children[0].Item1;
var priority = children[0].Item2;
var considerDetails = mesh.MaterialId != uint.MaxValue;
var builder = new Kn5MeshBuilder(considerDetails, considerDetails);
// AcToolsLogging.Write($"Merging together: {children.Select(x => $"{x.Item1.Name} [{x.Item2}]").JoinToString(", ")}");
var extraCounter = 0;
foreach (var child in children)
{
var transform = child.Item3 * Mat4x4.CreateScale(new Vec3((float)priority)) * Mat4x4.CreateTranslation(MoveAsideDistance(priority, stage));
var offset = mergeRules.GetOffsetAlongNormal(child.Item1);
for (var i = 0; i < child.Item1.Indices.Length; ++i)
{
builder.AddVertex(child.Item1.Vertices[child.Item1.Indices[i]].Transform(transform, offset));
if (i % 3 == 2 && builder.IsCloseToLimit)
{
builder.SetTo(mesh);
root.Children.Add(mesh);
mesh.Tag = priority;
builder.Clear();
mesh = Kn5MeshUtils.Create(children[0].Item1.Name + $"___$extra:{extraCounter}", children[0].Item1.MaterialId);
++extraCounter;
}
}
}
if (builder.Count > 0)
{
builder.SetTo(mesh);
root.Children.Add(mesh);
mesh.Tag = priority;
}
}
private static IKn5 LodFbxToKn5(IKn5 preparedKn5, string fbxFilename, CarLodGeneratorStageParams stage)
{
var fbx = FbxIO.Read(fbxFilename);
var geometries = fbx.GetGeometryIds()
.Select(id => new { id, name = fbx.GetNode("Model", fbx.GetConnection(id)).GetName("Model") })
.GroupBy(v => v.name).ToDictionary(x => x.Key, x => x.Select(v => v.id).ToList());
MergeNode(preparedKn5.RootNode);
foreach (var geometry in geometries.Where(g => g.Value.Count > 0))
{
var parent = preparedKn5.FirstByName(geometry.Key);
if (parent == null)
{
AcToolsLogging.Write($"Error: parent {geometry.Key} is missing");
continue;
}
var mesh = Kn5MeshUtils.Create($"{geometry.Key}__mesh_", parent.Children[0].MaterialId);
if (parent.Children.Count != 1)
{
throw new Exception("Unexpected arrangement");
}
MergeMeshWith(parent, mesh, geometry.Value.Select(x => Tuple.Create(fbx.GetGeometry(x), 1d)));
parent.Children.Add(mesh);
}
RemoveEmpty(preparedKn5.RootNode);
return(preparedKn5);
void MergeMeshWith(Kn5Node parent, Kn5Node mesh, IEnumerable <Tuple <FbxNode, double> > geometriesList)
{
var builder = new Kn5MeshBuilder();
var subCounter = 1;
foreach (var geometry in geometriesList)
{
var fbxIndices = geometry?.Item1?.GetRelative("PolygonVertexIndex")?.Value?.GetAsIntArray();
if (fbxIndices == null)
{
continue;
}
var fbxVertices = geometry.Item1.GetRelative("Vertices").Value.GetAsFloatArray();
var fbxNormals = geometry.Item1.GetRelative("LayerElementNormal").GetRelative("Normals").Value.GetAsFloatArray();
var fbxUvs = geometry.Item1.GetRelative("LayerElementUV").GetRelative("UV").Value.GetAsFloatArray();
var offset = MoveAsideDistance(geometry.Item2, stage);
var scale = (float)(1d / geometry.Item2);
for (var i = 0; i < fbxIndices.Length; ++i)
{
if (i % 3 == 0 && builder.IsCloseToLimit)
{
builder.SetTo(mesh);
mesh.RecalculateTangents();
builder.Clear();
var oldIndex = parent.Children.IndexOf(mesh);
mesh = Kn5MeshUtils.Create(mesh.Name + $"___$sub:{subCounter}", mesh.MaterialId);
++subCounter;
if (oldIndex != -1 && oldIndex < parent.Children.Count - 1)
{
parent.Children.Insert(oldIndex + 1, mesh);
}
else
{
parent.Children.Add(mesh);
}
}
var index = fbxIndices[i] < 0 ? -fbxIndices[i] - 1 : fbxIndices[i];
builder.AddVertex(new Kn5Node.Vertex {
Position = new Vec3((fbxVertices[index * 3] - offset.X) * scale, (fbxVertices[index * 3 + 1] - offset.Y) * scale,
(fbxVertices[index * 3 + 2] - offset.Z) * scale),
Normal = new Vec3(fbxNormals[i * 3], fbxNormals[i * 3 + 1], fbxNormals[i * 3 + 2]),
Tex = new Vec2(fbxUvs[i * 2], 1f - fbxUvs[i * 2 + 1])
});
}
}
builder.SetTo(mesh);
mesh.RecalculateTangents();
}
void MergeMesh(Kn5Node parent, Kn5Node node, IEnumerable <Kn5Node> merges)
{
if (Regex.IsMatch(node.Name, @"___\$extra:\d+$"))
{
node.Vertices = new Kn5Node.Vertex[0];
return;
}
MergeMeshWith(parent, node, Enumerable.Range(-1, 100).Select(i => GetGeometry(node, i)).TakeWhile(i => i != null)
.Concat(merges.Select(n => GetGeometry(n))));
}
Tuple <FbxNode, double> GetGeometry(Kn5Node node, int extraBit = -1)
{
var name = extraBit < 0 ? node.Name : $"{node.Name}___$extra:{extraBit}";
if (geometries.TryGetValue(name, out var list))
{
if (list.Count == 0)
{
return(null);
}
var geometryId = list[0];
list.RemoveAt(0);
return(Tuple.Create(fbx.GetGeometry(geometryId), node.Tag is double priority ? priority : 1d));
}
return(null);
}
void MergeNode(Kn5Node node)
{
foreach (var child in node.Children.ToList())
{
if (child.NodeClass == Kn5NodeClass.Base)
{
MergeNode(child);
}
else if (child.NodeClass == Kn5NodeClass.Mesh && child.Vertices.Length > 0)
{
var mergeKey = MergeKey(child);
var merge = node.Children.ApartFrom(child).Where(c => c.NodeClass == Kn5NodeClass.Mesh && MergeKey(c) == mergeKey).ToList();
MergeMesh(node, child, merge);
merge.ForEach(m => m.Vertices = new Kn5Node.Vertex[0]);
}
}
}
int MergeKey(Kn5Node node)
{
return((int)(node.MaterialId * 397) | (node.IsTransparent ? 1 << 31 : 0) | (node.CastShadows ? 1 << 30 : 0));
}
bool RemoveEmpty(Kn5Node node)
{
if (node.NodeClass == Kn5NodeClass.Mesh)
{
if (Regex.IsMatch(node.Name, @"___\$extra:\d+$"))
{
return(false);
}
return(node.Vertices.Length > 0);
}
if (node.NodeClass == Kn5NodeClass.SkinnedMesh)
{
return(false);
}
var found = node.Name.IndexOf("___$unique:", StringComparison.Ordinal);
if (found != -1)
{
node.Name = node.Name.Substring(0, found);
}
for (var i = 0; i < node.Children.Count; ++i)
{
if (!RemoveEmpty(node.Children[i]))
{
node.Children.RemoveAt(i);
--i;
}
}
return(node.Children.Count > 0);
}
}
