private vec3[] ArrangeNormals(ObjVNFContext context)
{
var normals = new vec3[context.vertexCount];
ObjVNFMesh mesh = context.Mesh;
for (int i = 0; i < context.faceCount; i++)
{
ObjVNFFace face = mesh.faces[i];
uint[] normalIndexes = (from item in face.NormalIndexes() select item).ToArray();
uint[] vertexIndexes = (from item in face.VertexIndexes() select item).ToArray();
if (normalIndexes.Length != vertexIndexes.Length)
{
throw new Exception(string.Format(
"normalIndexes.Length [{0}] != vertexIndexes.Length [{1}]!",
normalIndexes.Length, vertexIndexes.Length));
}
for (int t = 0; t < vertexIndexes.Length; t++)
{
normals[vertexIndexes[t]] = mesh.normals[normalIndexes[t]];
}
}
return(normals);
}
private ObjVNFFace ParseFace(string[] parts)
{
ObjVNFFace result = null;
if (parts.Length == 4)// f 1 2 3
{
uint v0, v1, v2, n0, n1, n2, t0, t1, t2;
ParseFaceUnit(parts[1], out v0, out n0, out t0);
ParseFaceUnit(parts[2], out v1, out n1, out t1);
ParseFaceUnit(parts[3], out v2, out n2, out t2);
// index in obj files starts with 1.
result = new ObjVNFTriangle(v0 - 1, v1 - 1, v2 - 1, n0 - 1, n1 - 1, n2 - 1, t0 - 1, t1 - 1, t2 - 1);
}
else if (parts.Length == 5)// f 1 2 3 4
{
uint v0, v1, v2, v3, n0, n1, n2, n3, t0, t1, t2, t3;
ParseFaceUnit(parts[1], out v0, out n0, out t0);
ParseFaceUnit(parts[2], out v1, out n1, out t1);
ParseFaceUnit(parts[3], out v2, out n2, out t2);
ParseFaceUnit(parts[4], out v3, out n3, out t3);
// index in obj files starts with 1.
result = new ObjVNFQuad(v0 - 1, v1 - 1, v2 - 1, v3 - 1, n0 - 1, n1 - 1, n2 - 1, n3 - 1, t0 - 1, t1 - 1, t2 - 1, t3 - 1);
}
else
{
throw new Exception(string.Format("unexpected line parts[{0}]", parts.Length));
}
return(result);
}
private vec2[] ArrangeTexCoords(ObjVNFContext context)
{
var texCoords = new vec2[context.vertexCount];
ObjVNFMesh mesh = context.Mesh;
for (int i = 0; i < context.faceCount; i++)
{
ObjVNFFace face = mesh.faces[i];
uint[] texCoordIndexes = face.TexCoordIndexes();
uint[] vertexIndexes = face.VertexIndexes();
if (texCoordIndexes.Length != vertexIndexes.Length)
{
throw new Exception(string.Format(
"texCoordIndexes.Length [{0}] != vertexIndexes.Length [{1}]!",
texCoordIndexes.Length, vertexIndexes.Length));
}
for (int t = 0; t < vertexIndexes.Length; t++)
{
texCoords[vertexIndexes[t]] = mesh.texCoords[texCoordIndexes[t]];
}
}
return(texCoords);
}
/// <summary>
/// Reads mesh's vertex count, normal count and face count.
/// </summary>
/// <param name="context"></param>
public override void Parse(ObjVNFContext context)
{
int triangleFaceCount = 0;
ObjVNFMesh mesh = context.Mesh;
for (int i = 0; i < context.faceCount; i++)
{
ObjVNFFace face = mesh.faces[i];
uint[] normalIndexes = (from item in face.NormalIndexes() select item).ToArray();
uint[] vertexIndexes = (from item in face.VertexIndexes() select item).ToArray();
if (normalIndexes.Length != vertexIndexes.Length)
{
throw new Exception(string.Format(
"normalIndexes.Length [{0}] != vertexIndexes.Length [{0}]!",
normalIndexes.Length, vertexIndexes.Length));
}
if (face is ObjVNFTriangle)
{
triangleFaceCount++;
}
else if (face is ObjVNFQuad)
{
triangleFaceCount += 2;
}
}
if (triangleFaceCount != context.faceCount)
{
var faces = new ObjVNFTriangle[triangleFaceCount];
for (int i = 0, j = 0; i < context.faceCount; i++)
{
ObjVNFFace face = mesh.faces[i];
if (face is ObjVNFTriangle)
{
faces[j++] = face as ObjVNFTriangle;
}
else if (face is ObjVNFQuad)
{
var quad = face as ObjVNFQuad;
faces[j++] = new ObjVNFTriangle(
quad.vertexIndexes[0], quad.vertexIndexes[1], quad.vertexIndexes[2],
quad.normalIndexes[0], quad.normalIndexes[1], quad.normalIndexes[2],
quad.texCoordIndexes[0], quad.texCoordIndexes[1], quad.texCoordIndexes[2]);
faces[j++] = new ObjVNFTriangle(
quad.vertexIndexes[0], quad.vertexIndexes[2], quad.vertexIndexes[3],
quad.normalIndexes[0], quad.normalIndexes[2], quad.normalIndexes[3],
quad.texCoordIndexes[0], quad.texCoordIndexes[2], quad.texCoordIndexes[3]);
}
}
mesh.faces = faces;
context.faceCount = triangleFaceCount;
}
}
private vec3[] CalculateNormals(ObjVNFContext context)
{
ObjVNFMesh mesh = context.Mesh;
var faceNormals = new vec3[context.faceCount];
for (int i = 0; i < context.faceCount; i++)
{
ObjVNFFace face = mesh.faces[i];
uint[] vertexIndexes = (from item in face.VertexIndexes() select item).ToArray();
vec3 v0 = mesh.vertexes[vertexIndexes[0]];
vec3 v1 = mesh.vertexes[vertexIndexes[1]];
vec3 v2 = mesh.vertexes[vertexIndexes[2]];
vec3 normal = (v0 - v1).cross(v0 - v2).normalize();
faceNormals[i] = normal;
}
var normals = new vec3[context.vertexCount];
var counters = new int[context.vertexCount];
for (int i = 0; i < context.faceCount; i++)
{
ObjVNFFace face = mesh.faces[i];
uint[] vertexIndexes = (from item in face.VertexIndexes() select item).ToArray();
vec3 v0 = mesh.vertexes[vertexIndexes[0]];
vec3 v1 = mesh.vertexes[vertexIndexes[1]];
vec3 v2 = mesh.vertexes[vertexIndexes[2]];
normals[vertexIndexes[0]] += faceNormals[i];
counters[vertexIndexes[0]]++;
normals[vertexIndexes[1]] += faceNormals[i];
counters[vertexIndexes[1]]++;
normals[vertexIndexes[2]] += faceNormals[i];
counters[vertexIndexes[2]]++;
}
for (int i = 0; i < normals.Length; i++)
{
if (counters[i] > 0)
{
normals[i] = normals[i].normalize();
}
}
return(normals);
}
/// <summary>
/// Reads mesh's vertex count, normal count and face count.
/// </summary>
/// <param name="context"></param>
public override void Parse(ObjVNFContext context) {
int triangleFaceCount = 0;
ObjVNFMesh mesh = context.Mesh;
for (int i = 0; i < context.faceCount; i++) {
ObjVNFFace face = mesh.faces[i];
uint[] vertexIndexes = face.VertexIndexes();
if (face is ObjVNFTriangle) {
triangleFaceCount++;
}
else if (face is ObjVNFQuad) {
triangleFaceCount += 2;
}
}
if (triangleFaceCount != context.faceCount) {
var faces = new ObjVNFTriangle[triangleFaceCount];
for (int i = 0, j = 0; i < context.faceCount; i++) {
ObjVNFFace face = mesh.faces[i];
if (face is ObjVNFTriangle) {
faces[j++] = face as ObjVNFTriangle;
}
else if (face is ObjVNFQuad) {
var quad = face as ObjVNFQuad;
faces[j++] = new ObjVNFTriangle(
quad.vertexIndexes[0], quad.vertexIndexes[1], quad.vertexIndexes[2],
quad.normalIndexes[0], quad.normalIndexes[1], quad.normalIndexes[2],
quad.texCoordIndexes[0], quad.texCoordIndexes[1], quad.texCoordIndexes[2]);
faces[j++] = new ObjVNFTriangle(
quad.vertexIndexes[0], quad.vertexIndexes[2], quad.vertexIndexes[3],
quad.normalIndexes[0], quad.normalIndexes[2], quad.normalIndexes[3],
quad.texCoordIndexes[0], quad.texCoordIndexes[2], quad.texCoordIndexes[3]);
}
}
mesh.faces = faces;
context.faceCount = triangleFaceCount;
}
}
/// <summary>
/// Reads mesh's vertexes, normals and faces.
/// </summary>
/// <param name="context"></param>
public override void Parse(ObjVNFContext context)
{
var objVNF = new ObjVNFMesh();
var vertexes = new vec3[context.vertexCount];
var normals = new vec3[context.normalCount];
var texCoords = new vec2[context.texCoordCount];
var faces = new ObjVNFFace[context.faceCount];
string filename = context.ObjFilename;
int vertexIndex = 0, normalIndex = 0, texCoordIndex = 0, faceIndex = 0;
using (var reader = new System.IO.StreamReader(filename))
{
while (!reader.EndOfStream)
{
string line = reader.ReadLine();
string[] parts = line.Split(separator, StringSplitOptions.RemoveEmptyEntries);
if (parts.Length <= 0)
{
continue;
}
if (parts[0] == "v")
{
vertexes[vertexIndex++] = ParseVec3(parts);
}
else if (parts[0] == "vn")
{
normals[normalIndex++] = ParseVec3(parts);
}
else if (parts[0] == "vt")
{
texCoords[texCoordIndex++] = ParseVec2(parts);
}
else if (parts[0] == "f")
{
faces[faceIndex++] = ParseFace(parts);
}
}
}
objVNF.vertexes = vertexes;
objVNF.normals = normals;
objVNF.texCoords = texCoords;
objVNF.faces = faces;
context.Mesh = objVNF;
if (vertexIndex != context.vertexCount)
{
throw new Exception(string.Format("v: [{0}] not equals to [{1}] in MeshParser!", vertexIndex, context.vertexCount));
}
if (normalIndex != context.normalCount)
{
throw new Exception(string.Format("vn: [{0}] not equals to [{1}] in MeshParser!", normalIndex, context.normalCount));
}
if (texCoordIndex != context.texCoordCount)
{
throw new Exception(string.Format("vt: [{0}] not equals to [{1}] in MeshParser!", texCoordIndex, context.texCoordCount));
}
if (faceIndex != context.faceCount)
{
throw new Exception(string.Format("f: [{0}] not equals to [{1}] in MeshParser!", vertexIndex, context.vertexCount));
}
if (faceIndex > 0)
{
Type type = faces[0].GetType();
for (int i = 1; i < faceIndex; i++)
{
if (faces[i].GetType() != type)
{
throw new Exception(string.Format("Different face types [{0}] vs [{1}]!", type, faces[i].GetType()));
}
}
}
}
