//
// Compute scene vertex normals
//
public void computeNormals(Scene3ds scene, Scene result)
{
Point3D vcenter = Point3D.Zero;
float vcounter = 0.0f;
for (int i = 0; i < scene.Meshes.Count(); i++)
{
Mesh3ds m = scene.Meshes.ElementAt(i);
// Alloc memory
Mesh mesh = new Mesh
{
Name = m.Name
};
result.Meshes.Add(mesh);
//mesh._numTexCoords = 0;
Vector3D[] tmpFaceNormals = new Vector3D[m.faces()];
// Compute face normals
for (int fi = 0; fi < m.faces(); fi++)
{
Face3ds f = m.face(fi);
Vertex3ds p0 = m.vertex(f.P0);
Vertex3ds p1 = m.vertex(f.P1);
Vertex3ds p2 = m.vertex(f.P2);
/*// Compute face middle point
mesh.faceMiddlePoint[fi] = new PVector();
mesh.faceMiddlePoint[fi].x = (p0.X + p1.X + p2.X) / 3.0f;
mesh.faceMiddlePoint[fi].y = (p0.Y + p1.Y + p2.Y) / 3.0f;
mesh.faceMiddlePoint[fi].z = (p0.Z + p1.Z + p2.Z) / 3.0f;*/
Point3D v0 = new Point3D(p0.X, p0.Y, p0.Z);
Point3D v1 = new Point3D(p1.X, p1.Y, p1.Z);
Point3D v2 = new Point3D(p2.X, p2.Y, p2.Z);
Vector3D e0 = v1 - v0;
Vector3D e1 = v2 - v0;
//mesh.faceNormals[fi] = e1.cross(e0);
// save a copy of the unnormalized face normal. used for average vertex normals
tmpFaceNormals[fi] = Vector3D.Cross(e1, e0);
// normalize face normal
//mesh.faceNormals[fi].normalize();
}
//
// Compute vertex normals.Take average from adjacent face normals.find coplanar faces or get weighted normals.
// One could also use the smooth groups from 3ds to compute normals, we'll see about that.
//
//PVector v = new PVector();
TexCoord3ds tc = new TexCoord3ds(0, 0);
for (int vi = 0; vi < m.vertices(); vi++)
{
Vertex3ds p = m.vertex(vi);
vcenter += new Point3D(p.X, p.Y, p.Z);
vcounter++;
if (m.texCoords() > 0) tc = m.texCoord(vi);
Vector3D n = Vector3D.Zero;
float num = 0;
for (int fi = 0; fi < m.faces(); fi++)
{
Face3ds f = m.face(fi);
// Vertex3ds p0 = m.vertex(f.P0);
// Vertex3ds p1 = m.vertex(f.P1);
// Vertex3ds p2 = m.vertex(f.P2);
if (vi == f.P0 || vi == f.P1 || vi == f.P2)
{
num++;
n += tmpFaceNormals[fi]; //mesh.faceNormals[fi] );
}
}
if (num > 0) n *= 1.0f/(float) num;
n.Normalize();
mesh.Normals.Add(n);
if (FLIPYZ)
{
Vector3D tmp = mesh.Normals[vi];
mesh.Normals[vi] = new Vector3D(tmp.X, -tmp.Z, tmp.Y);
}
// Save vertex data
if (FLIPYZ) mesh.Positions.Add(new Point3D(p.X, -p.Z, p.Y));
else mesh.Positions.Add(new Point3D(p.X, p.Y, p.Z));
// Save texcoord data
//mesh._numTexCoords = m.texCoords();
if (m.texCoords() > 0)
{
if (FLIPV) mesh.TextureCoordinates.Add(new Point3D(tc.U, 1.0f - tc.V, 0));
else mesh.TextureCoordinates.Add(new Point3D(tc.U, tc.V, 0));
}
}
}
if (vcounter > 0.0) vcenter /= vcounter;
}
public override Scene ImportFile(FileStream fileStream, string fileName)
{
Scene3ds scene3ds = new Scene3ds(fileStream, null, Scene3ds.DECODE_ALL);
Scene result = new Scene();
// Compute normals for our scene
computeNormals(scene3ds, result);
Material defaultMaterial = new Material
{
Name = "Default",
FileName = fileName,
DiffuseColor = ColorsRgbF.Gray,
SpecularColor = ColorsRgbF.White,
Shininess = 64
};
for (int i = 0; i < scene3ds.Materials.Count(); ++i)
{
Material3ds material3ds = scene3ds.Materials.ElementAt(i);
Material material = new Material
{
Name = material3ds.name(),
FileName = fileName,
DiffuseColor = material3ds.diffuse().ToColorRgbF(),
AmbientColor = material3ds.ambient().ToColorRgbF(),
SpecularColor = material3ds.specular().ToColorRgbF(),
Transparency = material3ds.transparency()
};
if ((int) material3ds._shininess != 0)
material.Shininess = (int) material3ds._shininess;
result.Materials.Add(material);
}
for (int i = 0; i < scene3ds.Meshes.Count(); ++i)
{
Mesh3ds mesh3ds = scene3ds.Meshes.ElementAt(i);
Mesh resultMesh = result.Meshes[i];
//resultMesh.Material = defaultMaterial;
// TODO: Is this right?
if (mesh3ds.faceMats() == 0)
{
resultMesh.Material = defaultMaterial;
for (int fi = 0; fi < mesh3ds.faces(); ++fi)
{
Face3ds f = mesh3ds.face(fi);
resultMesh.Indices.Add(f.P0);
resultMesh.Indices.Add(f.P1);
resultMesh.Indices.Add(f.P2);
}
}
else
{
// TODO: Split by face materials so that each mesh only has one material.
Debug.Assert(mesh3ds.faceMats() == 1);
for (int fm = 0; fm < mesh3ds.faceMats(); ++fm)
{
// Get current material's face.
FaceMat3ds fmat = mesh3ds.faceMat(fm);
Material material = result.Materials[fmat.material()];
resultMesh.Material = material;
for (int fi = 0; fi < fmat.faces(); ++fi)
{
int idx = fmat.face(fi);
Face3ds f = mesh3ds.face(idx);
resultMesh.Indices.Add(f.P0);
resultMesh.Indices.Add(f.P1);
resultMesh.Indices.Add(f.P2);
}
}
}
}
return result;
}
