public MainViewModel()
{
Current = this;
Engine = new Engine(900,600);
Cube = new Mesh("Cube", 8, 12);
Tetra = new Mesh("Tetraedrum", 4, 4);
Camera = new Camera();
CreateMeshes();
}
// The main method of the engine that re-compute each vertex projection
// during each frame
public void Render(Camera camera, Mesh mesh)
{
//First, we create the camera matrix.
var viewMatrix = Matrix.LookAtLH(camera.Position, camera.Target, Vector3.UnitY);
//Then, the projection matrix to add some perspective
var projectionMatrix = Matrix.PerspectiveFovRH(0.78f,
(float)this.Bitmap.PixelWidth / this.Bitmap.PixelHeight,
0.01f, 1.0f);
//Then the worldmatrix. Beware to apply rotation before translation
//var worldMatrix = Matrix.RotationYawPitchRoll(mesh.Rotation.Y,
// mesh.Rotation.X, mesh.Rotation.Z) *
// Matrix.Translation(mesh.Position);
//Let's play with quaternions!
var worldMatrix = QuaternionEngine.rotationMatrix(mesh.Rotation) *
Matrix.Translation(mesh.Position);
//Final transformMatrix, remember to multiply backwards
var transformMatrix = worldMatrix * viewMatrix * projectionMatrix;
// This is where magic happens: transfomed vertex are projected on the screen. First we identify each face, then transform its vertex and later we draw them
//and the lines that join them.
foreach (var face in mesh.Faces)
{
var vertexA = mesh.Vertices[face.A];
var vertexB = mesh.Vertices[face.B];
var vertexC = mesh.Vertices[face.C];
var pixelA = Project(vertexA, transformMatrix);
var pixelB = Project(vertexB, transformMatrix);
var pixelC = Project(vertexC, transformMatrix);
DrawLine(pixelA, pixelB);
DrawLine(pixelB, pixelC);
DrawLine(pixelC, pixelA);
}
}
