public static Matrix LookAtLH(Vector eye, Vector target, Vector up) {
var axisZ = (target - eye).Normalize();
var axisX = up.Cross(axisZ).Normalize();
var axisY = axisZ.Cross(axisX).Normalize();
var eyeX = -axisX.Dot(eye);
var eyeY = -axisY.Dot(eye);
var eyeZ = -axisZ.Dot(eye);
return new Matrix(new[] {
axisX.X, axisY.X, axisZ.X, 0,
axisX.Y, axisY.Y, axisZ.Y, 0,
axisX.Z, axisY.Z, axisZ.Z, 0,
eyeX, eyeY, eyeZ, 1
});
}
public Vector Interpolate(Vector v, float factor) {
return this + (v - this) * factor;
}
public float Dot(Vector v) {
return X * v.X + Y * v.Y + Z * v.Z;
}
public Vector Cross(Vector v) {
return new Vector(Y * v.Z - Z * v.Y, Z * v.X - X * v.Z, X * v.Y - Y * v.X);
}
public void DrawTriangle(Vector pa, Vector pb, Vector pc, Color color) {
var a = pa - pb;
var b = pc - pb;
var n = a.Cross(b);
var v = camera.Target - camera.Position;
if (n.Dot(v) >= 0) {
return;
}
DrawLine(pa, pb, color);
DrawLine(pa, pc, color);
DrawLine(pc, pb, color);
}
public void DrawPoint(Vector point, Color color) {
DrawPoint((int)point.X, (int)point.Y, point.Z, color);
}
public void DrawLine(Vector p0, Vector p1, Color color) {
canvasGraphics.DrawLine(new Pen(color), p0, p1);
}
private Vector Project(Vector coord, Matrix transformMatrix) {
var p = transformMatrix.Transform(coord);
p.X = p.X * Width + Width / 2f;
p.Y = -p.Y * Height + Height / 2f;
return p;
}
public static Matrix Rotation(Vector r) {
var x = RotationX(r.X);
var y = RotationY(r.Y);
var z = RotationZ(r.Z);
return z * x * y;
}
public Vector Transform(Vector v) {
var x = v.X * Values[0 * 4 + 0] + v.Y * Values[1 * 4 + 0] + v.Z * Values[2 * 4 + 0] + Values[3 * 4 + 0];
var y = v.X * Values[0 * 4 + 1] + v.Y * Values[1 * 4 + 1] + v.Z * Values[2 * 4 + 1] + Values[3 * 4 + 1];
var z = v.X * Values[0 * 4 + 2] + v.Y * Values[1 * 4 + 2] + v.Z * Values[2 * 4 + 2] + Values[3 * 4 + 2];
var w = v.X * Values[0 * 4 + 3] + v.Y * Values[1 * 4 + 3] + v.Z * Values[2 * 4 + 3] + Values[3 * 4 + 3];
return new Vector(x / w, y / w, z / w);
}
public static Matrix Translation(Vector t) {
var values = new[] {
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
t.X, t.Y, t.Z, 1
};
return new Matrix(values);
}
public static Matrix Scale(Vector s) {
var values = new[] {
s.X, 0, 0, 0,
0, s.Y, 0, 0,
0, 0, s.Z, 0,
0, 0, 0, 1
};
return new Matrix(values);
}
