public void Vertex_normal_data_should_be_correctly_associated_with_face_data_from_an_OBJ_file()
{
const string contents = @"
v 0 1 0
v -1 0 0
v 1 0 0
vn -1 0 0
vn 1 0 0
vn 0 1 0
f 1//3 2//1 3//2
f 1/0/3 2/102/1 3/14/2";
var objFile = ObjFile.Parse(contents);
var g = objFile.DefaultGroup;
var t1 = (SmoothTriangle)g.Children[0];
var t2 = (SmoothTriangle)g.Children[1];
t1.P1.Should().Be(objFile.Vertices[0]);
t1.P2.Should().Be(objFile.Vertices[1]);
t1.P3.Should().Be(objFile.Vertices[2]);
t1.N1.Should().Be(objFile.Normals[2]);
t1.N2.Should().Be(objFile.Normals[0]);
t1.N3.Should().Be(objFile.Normals[1]);
t1.Should().BeEquivalentTo(t2);
}
public void Parse_should_process_and_triangulate_polygonal_data_from_the_given_input()
{
const string contents = @"
v -1 1 0
v -1 0 0
v 1 0 0
v 1 1 0
v 0 2 0
f 1 2 3 4 5";
var objFile = ObjFile.Parse(contents);
Group g = objFile.DefaultGroup;
var t1 = (Triangle)g.Children[0];
var t2 = (Triangle)g.Children[1];
var t3 = (Triangle)g.Children[2];
t1.P1.Should().Be(objFile.Vertices[0]);
t1.P2.Should().Be(objFile.Vertices[1]);
t1.P3.Should().Be(objFile.Vertices[2]);
t2.P1.Should().Be(objFile.Vertices[0]);
t2.P2.Should().Be(objFile.Vertices[2]);
t2.P3.Should().Be(objFile.Vertices[3]);
t3.P1.Should().Be(objFile.Vertices[0]);
t3.P2.Should().Be(objFile.Vertices[3]);
t3.P3.Should().Be(objFile.Vertices[4]);
}
public void CreatesMultipleGroups()
{
var file = @"
v -1 1 0
v -1 0 0
v 1 0 0
v 1 1 0
v 0 2 0
g FirstGroup
f 1 2 3
g SecondGroup
f 1 3 4
";
var data = ObjFile.Parse(file);
var g1 = data.Groups[0];
var g2 = data.Groups[1];
var t1 = (Triangle)g1.Children[0];
var t2 = (Triangle)g2.Children[0];
t1.P1.Should().Be(data.Vertices[1]);
t1.P2.Should().Be(data.Vertices[2]);
t1.P3.Should().Be(data.Vertices[3]);
t2.P1.Should().Be(data.Vertices[1]);
t2.P2.Should().Be(data.Vertices[3]);
t2.P3.Should().Be(data.Vertices[4]);
}
public void ParsesToTrianglesWithNormals()
{
var file = @"
v 0 1 0
v -1 0 0
v 1 0 0
vn -1 0 0
vn 1 0 0
vn 0 1 0
f 1//3 2//1 3//2
f 1/0/3 2/102/1 3/14/2
";
var data = ObjFile.Parse(file);
var g = data.DefaultGroup;
var t1 = (SmoothTriangle)g.Children[0];
var t2 = (SmoothTriangle)g.Children[1];
t1.P1.Should().Be(data.Vertices[1]);
t1.P2.Should().Be(data.Vertices[2]);
t1.P3.Should().Be(data.Vertices[3]);
t1.N1.Should().Be(data.Normals[3]);
t1.N2.Should().Be(data.Normals[1]);
t1.N3.Should().Be(data.Normals[2]);
}
public void TriangulatesPolygons()
{
var file = @"
v -1 1 0
v -1 0 0
v 1 0 0
v 1 1 0
v 0 2 0
f 1 2 3 4 5
";
var data = ObjFile.Parse(file);
var g = data.DefaultGroup;
var t1 = (Triangle)g.Children[0];
var t2 = (Triangle)g.Children[1];
var t3 = (Triangle)g.Children[2];
t1.P1.Should().Be(data.Vertices[1]);
t1.P2.Should().Be(data.Vertices[2]);
t1.P3.Should().Be(data.Vertices[3]);
t2.P1.Should().Be(data.Vertices[1]);
t2.P2.Should().Be(data.Vertices[3]);
t2.P3.Should().Be(data.Vertices[4]);
t3.P1.Should().Be(data.Vertices[1]);
t3.P2.Should().Be(data.Vertices[4]);
t3.P3.Should().Be(data.Vertices[5]);
}
public void IgnoreUnrecognizedLines()
{
var gibberish = @"
There was a young lady named Bright
who traveled much faster than light.
She set out one day in a relative way,
and came back the previous night.";
var data = ObjFile.Parse(gibberish);
data.VertexCount().Should().Be(0);
}
public void Parse_should_silently_ignore_any_unrecognized_statements()
{
const string gibberish = @"
There was a young lady named Bright
who traveled much faster than light.
She set out one day
in a relative way,
and came back the previous night.";
var objFile = ObjFile.Parse(gibberish);
objFile.IgnoredLineCount.Should().Be(5);
}
public void Vertex_normal_data_should_be_correctly_imported_from_an_OBJ_file()
{
const string contents = @"
vn 0 0 1
vn 0.707 0 -0.707
vn 1 2 3";
var objFile = ObjFile.Parse(contents);
objFile.Normals.Should()
.HaveCount(3)
.And.ContainInOrder(new Vector(0, 0, 1), new Vector(0.707, 0, -0.707), new Vector(1, 2, 3));
}
public void ParsesNormalRecords()
{
var file = @"
vn 0 0 1
vn 0.707 0 -0.707
vn 1 2 3
";
var data = ObjFile.Parse(file);
data.Normals[1].Should().Be(new Normal(0, 0, 1));
data.Normals[2].Should().Be(new Normal(0.707f, 0, -0.707f));
data.Normals[3].Should().Be(new Normal(1, 2, 3));
}
public void ParsesVertexRecords()
{
var file = @"
v -1 1 0
v -1.0000 0.5000 0.0000
v 1 0 0
v 1 1 0
";
var data = ObjFile.Parse(file);
data.Vertices[1].Should().Be(new Point(-1, 1, 0));
data.Vertices[2].Should().Be(new Point(-1, 0.5f, 0));
data.Vertices[3].Should().Be(new Point(1, 0, 0));
data.Vertices[4].Should().Be(new Point(1, 1, 0));
}
public void Parse_should_process_vertex_data_from_the_given_input()
{
const string contents = @"
v -1 1 0
v -1.0000 0.5000 0.0000
v 1 0 0
v 1 1 0";
var objFile = ObjFile.Parse(contents);
objFile.Vertices.Should()
.HaveCount(4)
.And.ContainInOrder(
new Point(-1, 1, 0),
new Point(-1, 0.5, 0),
new Point(1, 0, 0),
new Point(1, 1, 0));
}
public void Parse_should_recognize_a_group_statement_and_add_subsequent_triangles_to_the_named_group()
{
const string contents = @"
v -1 1 0
v -1 0 0
v 1 0 0
v 1 1 0
g FirstGroup
f 1 2 3
g SecondGroup
f 1 3 4";
using var stream = new MemoryStream();
using var writer = new StreamWriter(stream, Encoding.ASCII, leaveOpen: true)
{
AutoFlush = true
};
writer.Write(contents);
stream.Position = 0;
var objFile = ObjFile.Parse(stream);
Group group1 = objFile.FindGroupByName("FirstGroup") ?? throw new InvalidOperationException();
Group group2 = objFile.FindGroupByName("SecondGroup") ?? throw new InvalidOperationException();
var t1 = (Triangle)group1.Children[0];
var t2 = (Triangle)group2.Children[0];
t1.P1.Should().Be(objFile.Vertices[0]);
t1.P2.Should().Be(objFile.Vertices[1]);
t1.P3.Should().Be(objFile.Vertices[2]);
t2.P1.Should().Be(objFile.Vertices[0]);
t2.P2.Should().Be(objFile.Vertices[2]);
t2.P3.Should().Be(objFile.Vertices[3]);
}
public void ParsesToTriangles()
{
var file = @"
v -1 1 0
v -1 0 0
v 1 0 0
v 1 1 0
f 1 2 3
f 1 3 4
";
var data = ObjFile.Parse(file);
var g = data.DefaultGroup;
var t1 = (Triangle)g.Children[0];
var t2 = (Triangle)g.Children[1];
t1.P1.Should().Be(data.Vertices[1]);
t1.P2.Should().Be(data.Vertices[2]);
t1.P3.Should().Be(data.Vertices[3]);
t2.P1.Should().Be(data.Vertices[1]);
t2.P1.Should().Be(data.Vertices[1]);
t2.P2.Should().Be(data.Vertices[3]);
t2.P3.Should().Be(data.Vertices[4]);
}
