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model.cpp
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model.cpp
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#include "model.h"
#include <stdexcept>
#include <cassert>
#include <fstream>
#include <unordered_map>
#include <unordered_set>
#include <climits>
#include <cstdlib>
#include <sstream>
#include <cctype>
using namespace std;
namespace
{
class OBJModelLoader : public ModelLoader
{
ifstream is;
static string readLine(istream &is)
{
if(!is)
return "";
while(is.peek() != EOF)
{
if(isspace(is.peek()))
{
is.get();
}
else if(is.peek() == '#') // comment
{
do
{
is.get();
}
while(is.peek() != '\r' && is.peek() != '\n' && is.peek() != EOF);
}
else
{
break;
}
}
if(is.peek() == EOF)
return "";
string retval = "";
do
{
retval += (char)is.get();
}
while(is.peek() != '\r' && is.peek() != '\n' && is.peek() != EOF);
return retval;
}
static vector<string> readTokenizedLine(istream &is)
{
string line = readLine(is);
vector<string> retval;
bool isStartOfToken = true;
for(char ch : line)
{
if(isblank(ch))
{
isStartOfToken = true;
}
else
{
if(isStartOfToken)
retval.push_back("");
isStartOfToken = false;
retval.back() += ch;
}
}
return std::move(retval);
}
static string canonicalizePath(string path)
{
char * str = realpath(path.c_str(), nullptr);
if(str == nullptr)
throw ModelLoadException("invalid path '" + path + "'");
string retval = str;
free(str);
return retval;
}
static bool isAbsolutePath(string path)
{
return path.substr(0, 1) == "/";
}
static string getNeighborFileName(string originalFile, string neighborFile)
{
if(neighborFile == "")
return "";
if(originalFile == "")
return "";
if(isAbsolutePath(neighborFile))
return canonicalizePath(neighborFile);
string file = canonicalizePath(originalFile);
file.erase(file.find_last_of('/'));
file += "/" + neighborFile;
return canonicalizePath(file);
}
static float parseFloat(string str)
{
istringstream is(str);
float retval;
if(!(is >> retval) || !isfinite(retval))
throw ModelLoadException("invalid floating-point number '" + str + "'");
return retval;
}
static int parseInt(string str)
{
istringstream is(str);
int retval;
if(!(is >> retval))
throw ModelLoadException("invalid integer '" + str + "'");
return retval;
}
static size_t parseIndex(string str, size_t size)
{
istringstream is(str);
ptrdiff_t retval;
if(!(is >> retval) || ((retval < 1 || retval > (ptrdiff_t)size) && (retval < -(ptrdiff_t)size || retval > -1)))
throw ModelLoadException("invalid index '" + str + "'");
if(retval < 0)
return retval + size;
return retval - 1;
}
tuple<VectorF, TextureCoord, bool, VectorF, bool> parseVertex(string str)
{
VectorF point, normal = VectorF(0);
TextureCoord textureCoord = TextureCoord(0, 0);
bool hasTextureCoord = false, hasNormal = false;
size_t firstSlashIndex = str.find_first_of('/');
if(firstSlashIndex == string::npos)
{
point = points[parseIndex(str, points.size())];
}
else
{
point = points[parseIndex(str.substr(0, firstSlashIndex), points.size())];
string rest = str.substr(firstSlashIndex + 1);
size_t secondSlashIndex = rest.find_first_of('/');
if(secondSlashIndex == string::npos)
{
hasTextureCoord = true;
textureCoord = textureCoords[parseIndex(rest, textureCoords.size())];
}
else
{
hasNormal = true;
normal = normals[parseIndex(rest.substr(secondSlashIndex + 1), normals.size())];
if(secondSlashIndex > 0)
{
hasTextureCoord = true;
textureCoord = textureCoords[parseIndex(rest.substr(0, secondSlashIndex), textureCoords.size())];
}
}
}
return tuple<VectorF, TextureCoord, bool, VectorF, bool>(point, textureCoord, hasTextureCoord, normal, hasNormal);
}
ColorF validateColor(ColorF color, function<void(string)> warningFunction)
{
const float eps = 1e-4;
if(color.r < -eps || color.r > 1 + eps || color.g < -eps || color.g > 1 + eps || color.b < -eps || color.b > 1 + eps || color.a < -eps || color.a > 1 + eps)
{
if(warningFunction)
warningFunction("color out of range : limiting");
}
return RGBAF(limit<float>(color.r, 0, 1), limit<float>(color.g, 0, 1), limit<float>(color.b, 0, 1), limit<float>(color.a, 0, 1));
}
ColorF parseColorSpecifier(const vector<string> &line, function<void(string)> warningFunction)
{
if(line.size() < 2)
throw ModelLoadException("too few arguments for " + line[0]);
if(line[1] == "xyz")
{
if(line.size() < 3)
throw ModelLoadException("too few arguments for " + line[0] + " xyz");
if(line.size() != 3 && line.size() != 5)
throw ModelLoadException("invalid argument count for " + line[0] + " xyz");
if(line.size() > 5)
throw ModelLoadException("too many arguments for " + line[0]);
float x = parseFloat(line[2]);
if(line.size() == 3)
{
return validateColor(XYZF(x, x, x), warningFunction);
}
float y = parseFloat(line[3]);
float z = parseFloat(line[4]);
return validateColor(XYZF(x, y, z), warningFunction);
}
if(line.size() > 4)
throw ModelLoadException("too many arguments for " + line[0]);
if(line.size() != 2 && line.size() != 4)
throw ModelLoadException("invalid argument count for " + line[0]);
if(line.size() == 2)
{
return validateColor(GrayscaleF(parseFloat(line[1])), warningFunction);
}
assert(line.size() == 4);
return validateColor(RGBF(parseFloat(line[1]), parseFloat(line[2]), parseFloat(line[3])), warningFunction);
}
shared_ptr<Texture> loadImage(string fileName)
{
shared_ptr<Texture> &retval = images[fileName];
if(retval == nullptr)
{
try
{
retval = make_shared<ImageTexture>(Image::loadImage(fileName));
}
catch(exception &e)
{
throw ModelLoadException((string)"can not load image : " + e.what());
}
}
return retval;
}
void parseMaterialLibrary(string fileName, function<void(string)> warningFunction)
{
ifstream is(fileName.c_str());
if(!is)
throw ModelLoadException("can't open '" + fileName + "'");
shared_ptr<Material> currentMaterial = nullptr;
string currentMaterialName = "";
bool hasAmbient = false, hasDiffuse = false, hasOpacity = false;
for(vector<string> line = readTokenizedLine(is); !line.empty(); line = readTokenizedLine(is))
{
if(line[0] == "Ks" ||
line[0] == "Tf" ||
line[0] == "Ns" ||
line[0] == "sharpness" ||
line[0] == "Ni" ||
line[0] == "map_Ka" ||
line[0] == "map_Ks" ||
line[0] == "map_Ns" ||
line[0] == "map_d" ||
line[0] == "disp" ||
line[0] == "decal" ||
line[0] == "bump" ||
line[0] == "refl")
{
if(warningFunction)
warningFunction(line[0] + " not implemented");
}
else if(line[0] == "newmtl")
{
if(line.size() < 2)
throw ModelLoadException("too few arguments for newmtl");
if(line.size() > 2)
throw ModelLoadException("too many arguments for newmtl");
currentMaterialName = line[1];
shared_ptr<Material> &m = materials[line[1]];
if(m != nullptr && warningFunction)
warningFunction("material already exists : '" + line[1] + "'");
m = make_shared<Material>();
currentMaterial = m;
hasAmbient = false;
hasDiffuse = false;
hasOpacity = false;
}
else if(line[0] == "Ka")
{
if(currentMaterial == nullptr)
throw ModelLoadException("Ka before newmtl");
if(hasAmbient && warningFunction)
warningFunction("Ka for material already specified");
hasAmbient = true;
currentMaterial->ambient = parseColorSpecifier(line, warningFunction);
}
else if(line[0] == "Kd")
{
if(currentMaterial == nullptr)
throw ModelLoadException("Kd before newmtl");
if(hasDiffuse && warningFunction)
warningFunction("Kd for material already specified");
hasDiffuse = true;
currentMaterial->diffuse = parseColorSpecifier(line, warningFunction);
}
else if(line[0] == "d")
{
if(currentMaterial == nullptr)
throw ModelLoadException("d before newmtl");
if(hasOpacity && warningFunction)
warningFunction("d for material already specified");
hasOpacity = true;
currentMaterial->opacity = getLuminanceValueF(parseColorSpecifier(line, warningFunction));
if(currentMaterial->opacity == 0 && warningFunction)
warningFunction("opacity equals 0 for " + currentMaterialName);
}
else if(line[0] == "map_Kd")
{
if(currentMaterial == nullptr)
throw ModelLoadException("map_Kd before newmtl");
if(currentMaterial->texture != nullptr && warningFunction)
warningFunction("map_Kd for material already specified");
if(line.size() < 2)
throw ModelLoadException("too few arguments for map_Kd");
if(line.size() > 2)
throw ModelLoadException("too many arguments for map_Kd");
currentMaterial->texture = loadImage(getNeighborFileName(fileName, line[1]));
}
else if(line[0] == "illum")
{
if(currentMaterial == nullptr)
throw ModelLoadException("illum before newmtl");
if(line.size() < 2)
throw ModelLoadException("too few arguments for illum");
if(line.size() > 2)
throw ModelLoadException("too many arguments for illum");
int model = parseInt(line[1]);
switch(model)
{
case 0:
currentMaterial->ambient = currentMaterial->diffuse;
currentMaterial->diffuse = GrayscaleF(0);
break;
case 1:
break;
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
case 10:
if(warningFunction)
{
ostringstream os;
os << "illum " << model << " not supported : treated as illum 1";
warningFunction(os.str());
}
break;
default:
throw ModelLoadException("illum model number out of range");
}
}
else
{
throw ModelLoadException("unknown command : " + line[0]);
}
}
}
vector<VectorF> points;
vector<TextureCoord> textureCoords;
vector<VectorF> normals;
unordered_map<string, shared_ptr<Material>> materials;
shared_ptr<Material> currentMaterial;
unordered_map<string, shared_ptr<Model>> models;
vector<string> modelList;
size_t currentReturnedModel = 0;
unordered_map<string, shared_ptr<Texture>> images;
public:
OBJModelLoader(string fileName, function<void(string)> warningFunction)
: is(fileName.c_str())
{
if(!is)
throw ModelLoadException("can't open '" + fileName + "'");
currentMaterial = make_shared<Material>();
materials[""] = currentMaterial;
shared_ptr<Model> currentModel = nullptr;
string currentModelName = "";
for(vector<string> line = readTokenizedLine(is); !line.empty(); line = readTokenizedLine(is))
{
if(line[0] == "call" ||
line[0] == "csh" ||
line[0] == "vp" ||
line[0] == "cstype" ||
line[0] == "deg" ||
line[0] == "bmat" ||
line[0] == "step" ||
line[0] == "p" ||
line[0] == "l" ||
line[0] == "curv" ||
line[0] == "curv2" ||
line[0] == "surf" ||
line[0] == "parm" ||
line[0] == "trim" ||
line[0] == "hole" ||
line[0] == "scrv" ||
line[0] == "sp" ||
line[0] == "end" ||
line[0] == "con" ||
line[0] == "g" ||
line[0] == "mg" ||
line[0] == "s" ||
line[0] == "bevel" ||
line[0] == "c_interp" ||
line[0] == "d_interp" ||
line[0] == "lod" ||
line[0] == "maplib" ||
line[0] == "usemap" ||
line[0] == "shadow_obj" ||
line[0] == "trace_obj" ||
line[0] == "ctech" ||
line[0] == "stech")
{
if(warningFunction)
warningFunction(line[0] + " not implemented");
}
else if(line[0] == "v")
{
VectorF v;
if(line.size() < 4)
throw ModelLoadException("too few arguments for v");
if(line.size() > 5)
throw ModelLoadException("too many arguments for v");
v.x = parseFloat(line[1]);
v.y = parseFloat(line[2]);
v.z = parseFloat(line[3]);
if(line.size() > 4)
parseFloat(line[4]);
points.push_back(v);
}
else if(line[0] == "vn")
{
VectorF v;
if(line.size() < 4)
throw ModelLoadException("too few arguments for vn");
if(line.size() > 4)
throw ModelLoadException("too many arguments for vn");
v.x = parseFloat(line[1]);
v.y = parseFloat(line[2]);
v.z = parseFloat(line[3]);
try
{
v = normalize(v);
}
catch(exception &)
{
throw ModelLoadException("normal zero for vn");
}
normals.push_back(v);
}
else if(line[0] == "vt")
{
TextureCoord v = TextureCoord(0, 0);
if(line.size() < 2)
throw ModelLoadException("too few arguments for vt");
if(line.size() > 4)
throw ModelLoadException("too many arguments for vt");
v.u = parseFloat(line[1]);
if(line.size() > 2)
v.v = parseFloat(line[2]);
if(line.size() > 3)
parseFloat(line[3]);
textureCoords.push_back(v);
}
else if(line[0] == "f")
{
if(line.size() < 4)
throw ModelLoadException("too few arguments for f");
auto vertex = parseVertex(line[1]);
bool hasTextureCoord = get<2>(vertex), hasNormal = get<4>(vertex);
Mesh faceMesh;
shared_ptr<Texture> texture = currentMaterial->texture;
if(hasNormal)
{
vector<tuple<VectorF, ColorF, TextureCoord, VectorF>> vertices;
vertices.reserve(line.size() - 1);
vertices.push_back(tuple<VectorF, ColorF, TextureCoord, VectorF>(get<0>(vertex), GrayscaleF(1), get<1>(vertex), get<3>(vertex)));
for(size_t i = 2; i < line.size(); i++)
{
vertex = parseVertex(line[i]);
if(hasTextureCoord != get<2>(vertex) || hasNormal != get<4>(vertex))
throw ModelLoadException("vertex parts do not match");
vertices.push_back(tuple<VectorF, ColorF, TextureCoord, VectorF>(get<0>(vertex), GrayscaleF(1), get<1>(vertex), get<3>(vertex)));
}
faceMesh = Generate::convexPolygon(texture, vertices);
}
else
{
vector<tuple<VectorF, ColorF, TextureCoord>> vertices;
vertices.reserve(line.size() - 1);
vertices.push_back(tuple<VectorF, ColorF, TextureCoord>(get<0>(vertex), GrayscaleF(1), get<1>(vertex)));
for(size_t i = 2; i < line.size(); i++)
{
vertex = parseVertex(line[i]);
if(hasTextureCoord != get<2>(vertex) || hasNormal != get<4>(vertex))
throw ModelLoadException("vertex parts do not match");
vertices.push_back(tuple<VectorF, ColorF, TextureCoord>(get<0>(vertex), GrayscaleF(1), get<1>(vertex)));
}
faceMesh = Generate::convexPolygon(texture, vertices);
}
if(currentModel == nullptr)
{
shared_ptr<Model> &m = models[currentModelName];
if(m == nullptr)
{
m = make_shared<Model>();
modelList.push_back(currentModelName);
}
currentModel = m;
}
//faceMesh = reverse(faceMesh);
if(currentModel->meshes.empty() || get<0>(currentModel->meshes.back()) != *currentMaterial)
{
currentModel->meshes.push_back(make_pair(*currentMaterial, faceMesh));
}
else
{
get<1>(currentModel->meshes.back()).append(faceMesh);
}
}
else if(line[0] == "o")
{
if(line.size() < 2)
throw ModelLoadException("too few arguments for o");
if(line.size() > 2)
throw ModelLoadException("too many arguments for o");
currentModelName = line[1];
shared_ptr<Model> &m = models[currentModelName];
if(m == nullptr)
{
m = make_shared<Model>();
modelList.push_back(currentModelName);
}
currentModel = m;
}
else if(line[0] == "usemtl")
{
if(line.size() < 2)
throw ModelLoadException("too few arguments for usemtl");
if(line.size() > 2)
throw ModelLoadException("too many arguments for usemtl");
auto iter = materials.find(line[1]);
if(iter == materials.end())
throw ModelLoadException("unknown material '" + line[1] + "'");
currentMaterial = get<1>(*iter);
}
else if(line[0] == "mtllib")
{
if(line.size() < 2)
throw ModelLoadException("too few arguments for mtllib");
if(line.size() > 2)
throw ModelLoadException("too many arguments for mtllib");
parseMaterialLibrary(getNeighborFileName(fileName, line[1]), warningFunction);
}
else
{
throw ModelLoadException("unknown command : " + line[0]);
}
}
is.close();
}
virtual pair<shared_ptr<Model>, string> load() override
{
if(currentReturnedModel >= modelList.size())
return make_pair(nullptr, "");
string name = modelList[currentReturnedModel++];
return make_pair(models[name], name);
}
};
class AC3DModelLoader : public ModelLoader // documentation is at http://www.inivis.com/ac3d/man/ac3dfileformat.html
{
ifstream is;
static string readLine(istream &is)
{
if(!is)
return "";
while(is.peek() != EOF)
{
if(isspace(is.peek()))
{
is.get();
}
#if 0
else if(is.peek() == '#') // comment
{
do
{
is.get();
}
while(is.peek() != '\r' && is.peek() != '\n' && is.peek() != EOF);
}
#endif
else
{
break;
}
}
if(is.peek() == EOF)
return "";
string retval = "";
do
{
retval += (char)is.get();
}
while(is.peek() != '\r' && is.peek() != '\n' && is.peek() != EOF);
return retval;
}
static vector<string> readTokenizedLine(istream &is)
{
string line = readLine(is);
vector<string> retval;
bool isStartOfToken = true, isInString = false;
for(char ch : line)
{
if(ch == '\"')
{
isInString = !isInString;
if(isStartOfToken)
retval.push_back("");
isStartOfToken = false;
retval.back() += ch;
}
else if(isblank(ch) && !isInString)
{
isStartOfToken = true;
}
else
{
if(isStartOfToken)
retval.push_back("");
isStartOfToken = false;
retval.back() += ch;
}
}
return std::move(retval);
}
static string canonicalizePath(string path)
{
char * str = realpath(path.c_str(), nullptr);
if(str == nullptr)
throw ModelLoadException("invalid path '" + path + "'");
string retval = str;
free(str);
return retval;
}
static bool isAbsolutePath(string path)
{
return path.substr(0, 1) == "/";
}
static string getNeighborFileName(string originalFile, string neighborFile)
{
if(neighborFile == "")
return "";
if(originalFile == "")
return "";
if(isAbsolutePath(neighborFile))
return canonicalizePath(neighborFile);
string file = canonicalizePath(originalFile);
file.erase(file.find_last_of('/'));
file += "/" + neighborFile;
return canonicalizePath(file);
}
static float parseFloat(string str)
{
istringstream is(str);
float retval;
if(!(is >> retval) || !isfinite(retval))
throw ModelLoadException("invalid floating-point number '" + str + "'");
return retval;
}
static float parseLimitedFloat(string str, float minV, float maxV, function<void(string)> warningFunction)
{
float retval = parseFloat(str);
if(warningFunction && (retval < minV || retval > maxV))
{
ostringstream ss;
ss << "number out of range (" << minV << " to " << maxV << ") : '" << str << "' : limiting";
warningFunction(ss.str());
}
return limit<float>(retval, minV, maxV);
}
static int parseInt(string str)
{
istringstream is(str);
int retval;
if(!(is >> retval))
throw ModelLoadException("invalid integer '" + str + "'");
return retval;
}
static string parseString(string str)
{
size_t finalSize = 0;
for(size_t i = 0; i < str.size(); i++)
{
if(str[i] != '\"')
str[finalSize++] = str[i];
}
str.resize(finalSize);
return str;
}
static size_t parseIndex(string str, size_t size)
{
istringstream is(str);
ptrdiff_t retval;
if(!(is >> retval) || retval < 0 || retval >= (ptrdiff_t)size)
throw ModelLoadException("invalid index '" + str + "'");
return retval;
}
ColorF validateColor(ColorF color, function<void(string)> warningFunction)
{
const float eps = 1e-4;
if(color.r < -eps || color.r > 1 + eps || color.g < -eps || color.g > 1 + eps || color.b < -eps || color.b > 1 + eps || color.a < -eps || color.a > 1 + eps)
{
if(warningFunction)
warningFunction("color out of range : limiting");
}
return RGBAF(limit<float>(color.r, 0, 1), limit<float>(color.g, 0, 1), limit<float>(color.b, 0, 1), limit<float>(color.a, 0, 1));
}
ColorF parseColorSpecifier(size_t startingIndex, function<void(string)> warningFunction, float scale = 1.0f)
{
if(line.size() < 3 + startingIndex)
throw ModelLoadException("too few arguments for " + line[0]);
return validateColor(RGBF(parseFloat(line[startingIndex]) * scale, parseFloat(line[startingIndex + 1]) * scale, parseFloat(line[startingIndex + 2]) * scale), warningFunction);
}
shared_ptr<Texture> loadImage(string fileName)
{
shared_ptr<Texture> &retval = images[fileName];
if(retval == nullptr)
{
if(fileName == "")
{
retval = make_shared<ImageTexture>(make_shared<Image>(GrayscaleI(0xFF)));
}
else
{
try
{
retval = make_shared<ImageTexture>(Image::loadImage(fileName));
}
catch(exception &e)
{
throw ModelLoadException((string)"can not load image : " + e.what());
}
}
}
return retval;
}
vector<pair<shared_ptr<Model>, string>> models;
vector<Material> materials;
size_t currentReturnedModel = 0;
unordered_map<string, shared_ptr<Texture>> images;
vector<string> line;
template <typename Fn>
static void warning(bool doWarning, function<void(string)> warningFunction, Fn msg)
{
if(doWarning && warningFunction)
warningFunction(msg());
}
void checkLineLength(size_t expectedLength, function<void(string)>)
{
if(line.size() > expectedLength)
throw ModelLoadException("too many arguments for " + line[0]);
if(line.size() < expectedLength)
throw ModelLoadException("too few arguments for " + line[0]);
}
pair<shared_ptr<Model>, string> parse(string fileName, function<void(string)> warningFunction)
{
shared_ptr<Model> model = make_shared<Model>();
unordered_map<Material, size_t> materialsMap;
if(line[0] == "OBJECT")
{
checkLineLength(2, warningFunction);
string objectKind = parseString(line[1]);
if(objectKind != "world" && objectKind != "group" && objectKind != "poly")
throw ModelLoadException("unknown kind : " + line[0]);
Matrix tform = Matrix::identity();
string name = "", data = "", url = "";
shared_ptr<Texture> texture = loadImage("");
vector<VectorF> vertices;
vector<tuple<VectorF, TextureCoord>> polyVertices;
//float textureRepeatX = 1, textureRepeatY = 1;
//float creaseAngle = 0; // i don't really know the default
for(line = readTokenizedLine(is); !line.empty(); line = readTokenizedLine(is))
{
if(line[0] == "name")
{
checkLineLength(2, warningFunction);
name = parseString(line[1]);
}
else if(line[0] == "data")
{
checkLineLength(2, warningFunction);
int charCount = parseInt(line[1]);
if(charCount < 1)
throw ModelLoadException("invalid character count for data : " + line[1]);
if(is.peek() == '\r')
{
is.get();
if(is.peek() == '\n')
is.get();
}
else if(is.peek() == '\n')
{
is.get();
}
else
throw ModelLoadException("missing data line");
for(int i = 0; i < charCount; i++)
{
int ch = is.get();
if(ch == EOF)
throw ModelLoadException("missing rest of data line");
data += (char)ch;
}
}
else if(line[0] == "texture")
{
checkLineLength(2, warningFunction);
string imageName = getNeighborFileName(fileName, parseString(line[1]));
texture = loadImage(imageName);
}
else if(line[0] == "texrep")
{
checkLineLength(3, warningFunction);
//textureRepeatX =
parseLimitedFloat(line[1], 1, 1, warningFunction);
//textureRepeatY =
parseLimitedFloat(line[2], 1, 1, warningFunction);
}
else if(line[0] == "rot")
{
checkLineLength(10, warningFunction);
tform.x00 = parseFloat(line[1]);
tform.x01 = parseFloat(line[2]);
tform.x02 = parseFloat(line[3]);
tform.x10 = parseFloat(line[4]);
tform.x11 = parseFloat(line[5]);
tform.x12 = parseFloat(line[6]);
tform.x20 = parseFloat(line[7]);
tform.x21 = parseFloat(line[8]);
tform.x22 = parseFloat(line[9]);
float maxV = max<float>(abs(tform.x00), abs(tform.x01));
maxV = max<float>(maxV, abs(tform.x02));
maxV = max<float>(maxV, abs(tform.x10));
maxV = max<float>(maxV, abs(tform.x11));
maxV = max<float>(maxV, abs(tform.x12));
maxV = max<float>(maxV, abs(tform.x20));
maxV = max<float>(maxV, abs(tform.x21));
maxV = max<float>(maxV, abs(tform.x22));
if(maxV < 1e-20 || abs(tform.determinant()) / maxV < 1e-5)
{
throw ModelLoadException("invalid rotation matrix : can not invert : " + line[0]);
}
}
else if(line[0] == "loc")
{
checkLineLength(4, warningFunction);
VectorF translation;
translation.x = parseFloat(line[1]);
translation.y = parseFloat(line[2]);
translation.z = parseFloat(line[3]);
tform = tform.concat(Matrix::translate(translation));
}
else if(line[0] == "url")
{
checkLineLength(2, warningFunction);
url = parseString(line[1]);
}
else if(line[0] == "crease") // from http://www.inivis.com/forum/showthread.php?t=5936
{
checkLineLength(2, warningFunction);
//creaseAngle =
parseLimitedFloat(line[1], 0, 180, warningFunction);
}
else if(line[0] == "numvert")
{
checkLineLength(2, warningFunction);
int vertexCount = parseInt(line[1]);
if(vertexCount < 0)
{
throw ModelLoadException("invalid vertex count : " + line[0]);
}
warning(vertexCount == 0, warningFunction, []()->string{return "zero vertices for numvert";});
for(int i = 0; i < vertexCount; i++)
{
line = readTokenizedLine(is);
if(line.empty())
throw ModelLoadException("too few lines in file : numvert");
if(line.size() < 3)
throw ModelLoadException("too few numbers on line : numvert");
if(line.size() > 3)
throw ModelLoadException("too many numbers on line : numvert");
VectorF v;
v.x = parseFloat(line[0]);
v.y = parseFloat(line[1]);
v.z = parseFloat(line[2]);
vertices.push_back(transform(tform, v));
}
}
else if(line[0] == "numsurf")
{
checkLineLength(2, warningFunction);
int surfaceCount = parseInt(line[1]);
if(surfaceCount < 0)
{
throw ModelLoadException("invalid surface count : " + line[0]);
}
warning(surfaceCount == 0, warningFunction, []()->string{return "zero surfaces for numsurf";});
for(int i = 0; i < surfaceCount; i++)
{
line = readTokenizedLine(is);
if(line.empty())
throw ModelLoadException("too few lines in file : numsurf");
if(line[0] != "SURF")
throw ModelLoadException("missing SURF : numsurf");
checkLineLength(2, warningFunction);
int flags = parseInt(line[1]);
if(flags < 0)
throw ModelLoadException("invalid SURF flags : out of range");
const int shadedFlagMask = 0x10, twoSidedFlagMask = 0x20, typeMask = 0xF;
enum
{
typePolygon = 0,
typeLineLoop = 1,
typeLine = 2
};
if((flags & typeMask) > 2)
throw ModelLoadException("invalid SURF flags : invalid type");
bool isShaded = true;
if(flags & shadedFlagMask)
isShaded = false;
bool isTwoSided = false;
if(flags & twoSidedFlagMask)
isTwoSided = true;
bool isLine = (flags & typeMask) != typePolygon;
warning((flags & ~(typeMask | shadedFlagMask | twoSidedFlagMask)) != 0, warningFunction, []()->string
{
return "unknown flag set : SURF";
});
warning(isLine, warningFunction, []()->string
{
return "lines ignored : SURF";
});
line = readTokenizedLine(is);
Material material = Material(GrayscaleF(1), GrayscaleF(0), 1, texture);
if(line.empty())
throw ModelLoadException("too few lines in file : SURF");
if(line[0] == "mat")
{
checkLineLength(2, warningFunction);
size_t materialIndex = parseIndex(line[1], materials.size());
if(isShaded)
{
material = materials[materialIndex];
material.texture = texture;
}
warning(!isShaded, warningFunction, []()->string
{
return "material specified for non-shaded SURF";
});
line = readTokenizedLine(is);
}
if(line[0] == "refs")
{
checkLineLength(2, warningFunction);
int vertexCount = parseInt(line[1]);
if(vertexCount <= 0)
throw ModelLoadException("vertex count out of range : refs");
polyVertices.clear();
polyVertices.reserve(vertexCount);
for(int i = 0; i < vertexCount; i++)
{
line = readTokenizedLine(is);
if(line.empty())
throw ModelLoadException("too few lines in file : refs");
if(line.size() < 3)
throw ModelLoadException("too few numbers on line : refs");
if(line.size() > 3)
throw ModelLoadException("too many numbers on line : refs");
size_t vertexIndex = parseIndex(line[0], vertices.size());
TextureCoord tc;
tc.u = parseFloat(line[1]);
tc.v = parseFloat(line[2]);
polyVertices.push_back(tuple<VectorF, TextureCoord>(vertices[vertexIndex], tc));
}
if(!isLine)
{
warning(vertexCount < 3, warningFunction, []()->string
{
return "too few vertices to make a polygon : ignored";
});
if(vertexCount >= 3)
{
Mesh theMesh = Generate::convexPolygon(texture, polyVertices);
if(isTwoSided)
theMesh.append(reverse(theMesh));
if(materialsMap.count(material) == 0)
{
materialsMap[material] = model->meshes.size();
model->meshes.push_back(pair<Material, Mesh>(material, theMesh));
}
else
{
std::get<1>(model->meshes[materialsMap[material]]).append(theMesh);
}
}
}
}
else
{
throw ModelLoadException("unknown directive : " + line[0]);
}
}
}