public static void AddMeshTo3DS(Lib3dsFile res, PSKFile f, Matrix m)
{
Lib3dsMesh mesh = new Lib3dsMesh();
string name = "Box00" + res.meshes.Count.ToString();
mesh.name = name;
mesh.matrix = Matrix2FA(Matrix.Identity);
mesh.vertices = new List<Lib3dsVertex>();
foreach (PSKFile.PSKPoint p in f.psk.points)
{
Vector3 v = p.ToVector3();
v = Vector3.TransformCoordinate(v, m);
mesh.vertices.Add(new Lib3dsVertex(v.X, -v.Y, v.Z));
}
mesh.texcos = new List<Lib3dsTexturecoordinate>();
for (int i = 0; i < f.psk.points.Count; i++)
foreach (PSKFile.PSKEdge e in f.psk.edges)
if (e.index == i)
mesh.texcos.Add(new Lib3dsTexturecoordinate(e.U, e.V));
mesh.faces = new List<Lib3dsFace>();
foreach (PSKFile.PSKFace face in f.psk.faces)
{
Lib3dsFace ff = new Lib3dsFace();
ff.flags = 6;
ff.index = new ushort[3];
ff.index[0] = (ushort)f.psk.edges[face.v0].index;
ff.index[1] = (ushort)f.psk.edges[face.v2].index;
ff.index[2] = (ushort)f.psk.edges[face.v1].index;
mesh.faces.Add(ff);
}
mesh.nfaces = (ushort)mesh.faces.Count;
mesh.nvertices = (ushort)mesh.vertices.Count;
mesh.map_type = Lib3dsMapType.LIB3DS_MAP_NONE;
mesh.object_flags = 0;
mesh.color = 128;
res.meshes.Add(mesh);
Lib3dsNode node = new Lib3dsMeshInstanceNode();
node.matrixNode = Matrix2FA(Matrix.Identity);
node.parent = null;
node.parent_id = 0xffff;
node.hasNodeID = true;
node.type = Lib3dsNodeType.LIB3DS_NODE_MESH_INSTANCE;
node.flags = res.nodes[0].flags;
node.node_id = (ushort)(res.meshes.Count() - 1);
node.name = name;
res.nodes.Add(node);
}
// Calculates the vertex normals corresponding to the smoothing group
// settings for each face of a mesh.
//
// \param mesh A pointer to the mesh to calculate the normals for.
// \param normals A pointer to a buffer to store the calculated
// normals. The buffer must have the size:
// 3*3*sizeof(float)*mesh.nfaces.
//
// To allocate the normal buffer do for example the following:
// \code
// Lib3dsVector *normals = malloc(3*3*sizeof(float)*mesh.nfaces);
// \endcode
//
// To access the normal of the i-th vertex of the j-th face do the
// following:
// \code
// normals[3*j+i]
// \endcode
public static void lib3ds_mesh_calculate_vertex_normals(Lib3dsMesh mesh, float[][] normals)
{
if (mesh.nfaces == 0)
{
return;
}
Lib3dsFaces[] fl = new Lib3dsFaces[mesh.nvertices];
Lib3dsFaces[] fa = new Lib3dsFaces[3 * mesh.nfaces];
for (int i = 0; i < fa.Length; i++)
{
fa[i] = new Lib3dsFaces();
}
for (int i = 0; i < mesh.nfaces; i++)
{
for (int j = 0; j < 3; j++)
{
Lib3dsFaces l = fa[3 * i + j];
float[] p = new float[3], q = new float[3], n = new float[3];
float len, weight;
l.index = i;
l.next = fl[mesh.faces[i].index[j]];
fl[mesh.faces[i].index[j]] = l;
lib3ds_vector_sub(p, mesh.vertices[mesh.faces[i].index[j < 2?j + 1:0]], mesh.vertices[mesh.faces[i].index[j]]);
lib3ds_vector_sub(q, mesh.vertices[mesh.faces[i].index[j > 0?j - 1:2]], mesh.vertices[mesh.faces[i].index[j]]);
lib3ds_vector_cross(n, p, q);
len = lib3ds_vector_length(n);
if (len > 0)
{
weight = (float)Math.Atan2(len, lib3ds_vector_dot(p, q));
lib3ds_vector_scalar_mul(l.normal, n, weight / len);
}
else
{
lib3ds_vector_zero(l.normal);
}
}
}
for (int i = 0; i < mesh.nfaces; i++)
{
Lib3dsFace f = mesh.faces[i];
for (int j = 0; j < 3; j++)
{
float[] n = new float[3];
Lib3dsFaces p;
Lib3dsFace pf;
Debug.Assert(mesh.faces[i].index[j] < mesh.nvertices);
if (f.smoothing_group != 0)
{
uint smoothing_group = f.smoothing_group;
lib3ds_vector_zero(n);
for (p = fl[mesh.faces[i].index[j]]; p != null; p = p.next)
{
pf = mesh.faces[p.index];
if ((pf.smoothing_group & f.smoothing_group) != 0)
{
smoothing_group |= pf.smoothing_group;
}
}
for (p = fl[mesh.faces[i].index[j]]; p != null; p = p.next)
{
pf = mesh.faces[p.index];
if ((smoothing_group & pf.smoothing_group) != 0)
{
lib3ds_vector_add(n, n, p.normal);
}
}
}
else
{
lib3ds_vector_copy(n, fa[3 * i + j].normal);
}
lib3ds_vector_normalize(n);
lib3ds_vector_copy(normals[3 * i + j], n);
}
}
}
