public void SplitEdge_ShouldWorkOnSimpleQuad()
{
// Arrange
var positions = new[]
{
new Vec3d(0, 0, 0),
new Vec3d(1, 0, 0),
new Vec3d(1, 1, 0),
new Vec3d(0, 1, 0),
};
var rand = new Random();
Mesh.Core.Mesh mesh = null;
for (int i = 0; i < 100; i++)
{
mesh = Mesh.Core.Mesh.CreateSingleFace(positions);
// Act
var index = rand.Next(0, 4);
var param = rand.Next(2, 8) / 10.0;
mesh.SplitEdge(index, param, out _);
// Assert
Assert.AreEqual(1, mesh.FaceCount);
Assert.AreEqual(5, mesh.VertexCount);
Assert.AreEqual(10, mesh.HalfEdgeCount);
}
SimpleExporter.Export("D:\\Git\\PolygonMesh\\PolygonMesh.Library.Tests\\Resources\\test.obj", mesh);
}
public void SplitFace_And_SplitEdge_Together_Can_Turn_Simple_Quad_Into_Two_Rectangles()
{
// Arrange
var positions = new[]
{
new Vec3d(0, 0, 0),
new Vec3d(1, 0, 0),
new Vec3d(1, 1, 0),
new Vec3d(0, 1, 0),
};
Mesh.Core.Mesh mesh = Mesh.Core.Mesh.CreateSingleFace(positions);
// Act
mesh.SplitEdge(0, 0, 0.5, out _);
mesh.SplitEdge(0, 3, 0.5, out _);
mesh.SplitFace(0, 1, 4, out _);
// Assert
//Assert.AreEqual(6, mesh.VertexCount);
//Assert.AreEqual(14, mesh.HalfEdgeCount);
//Assert.AreEqual(2, mesh.FaceCount);
SimpleExporter.Export("D:\\Git\\PolygonMesh\\PolygonMesh.Library.Tests\\Resources\\test.obj", mesh);
}
public void SplitFace_And_SplitEdge_Together_Can_Create_Complex_Mesh()
{
// building the mesh from this: https://w3.cs.jmu.edu/bowersjc/page/courses/spring17/cs480/labs/images/final_dcel.png
// Arrange
var positions = new[]
{
new Vec3d(0, 0, 0),
new Vec3d(2, 0, 0),
new Vec3d(2, 1, 0),
new Vec3d(0, 1, 0),
};
Mesh.Core.Mesh mesh = Mesh.Core.Mesh.CreateSingleFace(positions);
// Act
// split in half
mesh.SplitEdge(0, 0, 0.5, out var firstEdgeIndices);
mesh.SplitEdge(0, 3, 0.5, out var secondEdgeIndices);
mesh.SplitFace(0, firstEdgeIndices.Item2, secondEdgeIndices.Item2, out _);
// split right quad in two triangles
mesh.SplitFace(0, 0, 2, out _);
// split left quad in three triangles
mesh.SplitEdge(1, 0, 0.5, out firstEdgeIndices);
mesh.SplitFace(1, firstEdgeIndices.Item2, 3, out var facePartIndices);
mesh.SplitFace(facePartIndices.Item2, 1, 3, out facePartIndices);
// split middle triangle of split left quad in half
mesh.SplitEdge(facePartIndices.Item2, 0, 0.5, out firstEdgeIndices);
mesh.SplitEdge(facePartIndices.Item2, 3, 0.5, out secondEdgeIndices);
mesh.SplitFace(facePartIndices.Item2, firstEdgeIndices.Item2, secondEdgeIndices.Item2, out facePartIndices);
// split lower quad of split triangle in half
mesh.SplitEdge(facePartIndices.Item1, 0, 0.5, out firstEdgeIndices);
mesh.SplitEdge(facePartIndices.Item1, 3, 0.5, out secondEdgeIndices);
mesh.SplitFace(facePartIndices.Item1, firstEdgeIndices.Item2, secondEdgeIndices.Item2, out _);
// Assert
Assert.AreEqual(11, mesh.VertexCount);
Assert.AreEqual(7, mesh.FaceCount);
Assert.AreEqual(38, mesh.HalfEdgeCount); // i think it should be 34 instead
SimpleExporter.Export("D:\\Git\\PolygonMesh\\PolygonMesh.Library.Tests\\Resources\\test.obj", mesh);
}