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);
}
public static void ExportP3D(P3D p3d, string path)
{
Lib3dsFile file = LIB3DS.lib3ds_file_new();
//file.frames = 0;
// Lib3dsMaterial mat = LIB3DS.lib3ds_material_new("c_white");
// //LIB3DS.lib3ds_file_insert_material(file, mat, -1);
// mat.diffuse[0] = 1;
// mat.diffuse[1] = 1;
// mat.diffuse[2] = 1;
foreach (Mesh P3Dmesh in p3d.MeshesChunk.Meshes)
{
Lib3dsMesh mesh = LIB3DS.lib3ds_mesh_new(P3Dmesh.Name);
Lib3dsMeshInstanceNode inst;
LIB3DS.lib3ds_file_insert_mesh(file, mesh, -1);
LIB3DS.lib3ds_mesh_resize_vertices(mesh, (ushort)P3Dmesh.NumVertices, true, false);
for (int i = 0; i < P3Dmesh.NumVertices; i++)
{
mesh.vertices[i].x = P3Dmesh.Vertices[i].x;
mesh.vertices[i].z = P3Dmesh.Vertices[i].y;
mesh.vertices[i].y = P3Dmesh.Vertices[i].z;
mesh.texcos[i].s = findVerticeU(i, P3Dmesh);
mesh.texcos[i].t = findVerticeV(i, P3Dmesh);
}
LIB3DS.lib3ds_mesh_resize_faces(mesh, (ushort)P3Dmesh.NumPolys);
for (int i = 0; i < P3Dmesh.NumPolys; i++)
{
mesh.faces[i].index[2] = (ushort)P3Dmesh.Polygons[i].P1;
mesh.faces[i].index[1] = (ushort)P3Dmesh.Polygons[i].P2;
mesh.faces[i].index[0] = (ushort)P3Dmesh.Polygons[i].P3;
mesh.faces[i].material = _3dsMaterials.Instance.GetMaterial(P3Dmesh.Polygons[i].Texture, P3Dmesh.Polygons[i].Material, file);
mesh.faces[i].smoothing_group = (uint)1;
}
float[] pos = { P3Dmesh.LocalPos.x, P3Dmesh.LocalPos.z, P3Dmesh.LocalPos.y };
inst = LIB3DS.lib3ds_node_new_mesh_instance(mesh, String.Empty, pos, null, null);
LIB3DS.lib3ds_file_append_node(file, inst, null);
}
foreach (Light p3dlight in p3d.LightsChunk.Lights)
{
Lib3dsLight light = LIB3DS.lib3ds_light_new(p3dlight.Name);
LIB3DS.lib3ds_file_insert_light(file, light, -1);
light.color[0] = Convert.ToSingle(p3dlight.GetColorRed()) / 255;
light.color[1] = Convert.ToSingle(p3dlight.GetColorGreen()) / 255;
light.color[2] = Convert.ToSingle(p3dlight.GetColorBlue()) / 255;
float[] pos = { p3dlight.Position.x, p3dlight.Position.z, p3dlight.Position.y };
light.position = pos;
light.inner_range = p3dlight.Radius;
light.multiplier = 1.5f;
Lib3dsOmnilightNode inst = LIB3DS.lib3ds_node_new_omnilight(light);
LIB3DS.lib3ds_file_append_node(file, inst, null);
}
if (!LIB3DS.lib3ds_file_save(file, path))
{
MessageBox.Show("ERROR: Saving 3ds file failed!");
}
LIB3DS.lib3ds_file_free(file);
}
//写3DS文件
protected virtual bool writeToFile()
{
if (mDbVertices == null || mDbTextureCoors == null || uFacesIndex == null)
{
return(false);
}
//新建LIB3DS文件对象
Lib3dsFile file = LIB3DS.lib3ds_file_new();
file.frames = 360;
//新建网格节点
Lib3dsMesh mesh = LIB3DS.lib3ds_mesh_new("mesh");
Lib3dsMeshInstanceNode inst;
LIB3DS.lib3ds_file_insert_mesh(file, mesh, -1);
//一、将顶点写入网格
int nVertices = mDbVertices.GetLength(0);
LIB3DS.lib3ds_mesh_resize_vertices(mesh, (ushort)nVertices, true, false);
for (int i = 0; i < nVertices; i++)
{
Lib3dsVertex vertexTmp = new Lib3dsVertex(mDbVertices[i, 0], mDbVertices[i, 1], mDbVertices[i, 2]);
LIB3DS.lib3ds_vector_copy(mesh.vertices[i], vertexTmp);
//将纹理坐标写入网格
mesh.texcos[i] = new Lib3dsTexturecoordinate(mDbTextureCoors[i, 0], mDbTextureCoors[i, 1]);
}
//二、将纹理信息写入文件
Lib3dsMaterial mat = LIB3DS.lib3ds_material_new("material1");
LIB3DS.lib3ds_file_insert_material(file, mat, -1);
//如果没有指定纹理，则默认为灰色材质
if (String.IsNullOrEmpty(mSzTextureFilename))
{
mat.diffuse[0] = 0.5f;
mat.diffuse[1] = 0.5f;
mat.diffuse[2] = 0.5f;
}
else
{
mat.texture1_map.name = mSzTextureFilename;
mat.texture1_map.percent = 1.0f;
}
//三、将三角化后的面的顶点索引号写入网格
int nFaces = uFacesIndex.GetLength(0);
LIB3DS.lib3ds_mesh_resize_faces(mesh, (ushort)nFaces);
for (int i = 0; i < nFaces; i++)
{
for (int j = 0; j < 3; j++)
{
mesh.faces[i].index[j] = uFacesIndex[i, j];
}
//指定每个三角化后的面的材质
mesh.faces[i].material = 0;
}
inst = LIB3DS.lib3ds_node_new_mesh_instance(mesh, "01", null, null, null);
LIB3DS.lib3ds_file_append_node(file, inst, null);
if (!LIB3DS.lib3ds_file_save(file, mSzOutputFilename))
{
LIB3DS.lib3ds_file_free(file);
return(false);
}
LIB3DS.lib3ds_file_free(file);
return(true);
}