private void readPolygons(StreamTokenizer lex, Scene scene, List<Vector> vertices, Material shapeMaterial, Matrix shapeMatrix)
{
int startLevel = lex.BracketLevel;
while (!lex.EndOfStream)
{
double i1 = 0;
if (lex.TryReadDouble(out i1))
{
// read polyline till -1
double iPreLast = lex.ReadDouble();
double iLast = lex.ReadDouble();
while (iLast != -1)
{
scene.addObject(new Triangle(shapeMaterial,
shapeMatrix * vertices[(int)i1],
shapeMatrix * vertices[(int)iPreLast],
shapeMatrix * vertices[(int)iLast]));
iPreLast = iLast;
iLast = lex.ReadDouble();
}
}
if (lex.BracketLevel <= startLevel)
return;
}
}
public void AddToSceneFrom(Scene scene, string fileName)
{
using (FileStream stream = File.Open(fileName, FileMode.Open, FileAccess.Read))
{
StreamTokenizer lex = new StreamTokenizer(stream);
readWholeFile(lex, scene);
}
}
private void readShapeObject(StreamTokenizer lex, Scene scene, Matrix shapeMatrix)
{
int startLevel = lex.BracketLevel;
List<Vector> shapeVertices = null;
Material shapeMaterial = new Material(Color.Black, 0, 0);
while (!lex.EndOfStream)
{
lex.NextWord();
if (lex.BracketLevel <= startLevel)
return;
if (lex.Word == "diffuseColor")
{
double r = lex.ReadDouble();
double g = lex.ReadDouble();
double b = lex.ReadDouble();
shapeMaterial.Color = new Color(r, g, b, 1.0);
}
if (lex.Word == "transparency")
{
Color shapeColor = shapeMaterial.Color;
shapeColor.A = 1 - lex.ReadDouble();
shapeMaterial.Color = shapeColor;
}
if (lex.Word == "shininess")
{
shapeMaterial.Reflectance = lex.ReadDouble();
shapeMaterial.Specular = shapeMaterial.Reflectance;
}
if (lex.Word == "point")
{
shapeVertices = readShapeVertices(lex);
}
if (lex.Word == "coordIndex")
{
scene.addMaterial(shapeMaterial);
readPolygons(lex, scene, shapeVertices, shapeMaterial, shapeMatrix);
}
if (lex.BracketLevel <= startLevel)
return;
}
}
private void readWholeFile(StreamTokenizer lex, Scene scene)
{
while (!lex.EndOfStream)
{
while (lex.Word == "Transform")
{
readTransformObject(lex, scene);
}
lex.NextWord();
}
}
private void readTransformObject(StreamTokenizer lex, Scene scene)
{
int startLevel = lex.BracketLevel;
while (!lex.EndOfStream)
{
lex.NextWord();
// check to return immediately after reading word
if (lex.BracketLevel <= startLevel)
return;
// transform matrix
Matrix ShapeMatrix = TransformMatrix;
while (lex.Word == "Transform")
{
// nested transforms
readTransformObject(lex, scene);
}
if (lex.Word == "translation")
{
double tx = lex.ReadDouble();
double ty = lex.ReadDouble();
double tz = lex.ReadDouble();
ShapeMatrix = TransformMatrix.Translate(tx, ty, tz);
}
while (lex.Word == "Shape")
{
readShapeObject(lex, scene, ShapeMatrix);
}
// must have chance to return immediately after returning,
// because the word might be needed several levels higher
if (lex.BracketLevel <= startLevel)
return;
}
}
private List<Vector> readShapeVertices(StreamTokenizer lex)
{
List<Vector> result = new List<Vector>(200);
int startLevel = lex.BracketLevel;
while (!lex.EndOfStream)
{
double x = 0;
if (lex.TryReadDouble(out x))
{
// more vertices available
double y = lex.ReadDouble();
double z = lex.ReadDouble();
result.Add(new Vector(x, y, z));
}
else
{
int a = 5;
int b = a;
}
if (lex.BracketLevel <= startLevel)
break;
}
return result;
}
