public Vector2d Project2d(Vector3d coord, Primitives.Matrix transMat)
{
var point = Vector3d.TransformCoordinate(coord, transMat);
var x = point.x * Common.CanvasWidth + Common.CanvasWidth / 2.0f;
var y = -point.y * Common.CanvasHeight + Common.CanvasHeight / 2.0f;
return(new Vector2d(x, y));
}
public Vertex Project(Vertex vertex, Primitives.Matrix transMat, Primitives.Matrix world)
{
// 进行坐标变换
var point = Vector3d.TransformCoordinate(vertex.Coordinates, transMat);
// 在三维世界中转换坐标和法线的顶点
var point3dWorld = Vector3d.TransformCoordinate(vertex.Coordinates, world);
var normal3dWorld = Vector3d.TransformCoordinate(vertex.Normal, world);
// 变换后的坐标起始点是坐标系的中心点
// 但是，在屏幕上，我们以左上角为起始点
// 我们需要重新计算使他们的起始点变成左上角
var x = point.x * Common.CanvasWidth + Common.CanvasWidth / 2.0f;
var y = -point.y * Common.CanvasHeight + Common.CanvasHeight / 2.0f;
return(new Vertex
{
Coordinates = new Vector3d(x, y, point.z),
Normal = normal3dWorld,
WorldCoordinates = point3dWorld,
TextureCoordinates = vertex.TextureCoordinates
});
}
