public void AddCamera()
{
const string yaml = @"
- add: camera
width: 100
height: 100
field-of-view: 0.785
from: [ -6, 6, -10 ]
to: [ 6, 0, 6 ]
up: [ -0.45, 1, 0 ]";
var parser = new YamlParser();
var(_, camera) = parser.LoadYaml(yaml);
var transform = ViewTransform.Create(
new Point(-6, 6, -10),
new Point(6, 0, 6),
new Vector(-0.45f, 1, 0));
Assert.Equal(100, camera.Width);
Assert.Equal(100, camera.Height);
Assert.Equal(0.785f, camera.FieldOfView);
Assert.Equal(transform, camera.Transform);
}
public void CreateDefaultOrientation()
{
var from = new Point(0, 0, 0);
var to = new Point(0, 0, -1);
var up = new Vector(0, 1, 0);
Assert.Equal(Matrix4x4.Identity(), ViewTransform.Create(from, to, up));
}
public void CreateTranslation()
{
var from = new Point(0, 0, 8);
var to = new Point(0, 0, 0);
var up = new Vector(0, 1, 0);
var expected = Matrix4x4.Translation(0, 0, -8);
var actual = ViewTransform.Create(from, to, up);
Assert.Equal(expected, actual);
}
public void CreateScaling()
{
var from = new Point(0, 0, 0);
var to = new Point(0, 0, 1);
var up = new Vector(0, 1, 0);
var expected = Matrix4x4.Scaling(-1, 1, -1);
var actual = ViewTransform.Create(from, to, up);
Assert.Equal(expected, actual);
}
public void RenderDefaultWorld()
{
var from = new Point(0, 0, -5);
var to = new Point(0, 0, 0);
var up = new Vector(0, 1, 0);
var transform = ViewTransform.Create(from, to, up);
var camera = new Camera(11, 11, MathF.PI / 2, transform);
var world = new DefaultWorld();
var canvas = world.Render(camera);
Assert.Equal(new Color(0.38066f, 0.47583f, 0.2855f), canvas[5, 5]);
}
private Camera ParseCamera(YamlNode node)
{
var width = 0;
var height = 0;
float fieldOfView = 0;
var from = Point.Zero;
var to = Point.Zero;
var up = Vector.UnitY;
foreach (var child in (YamlMappingNode)node)
{
var key = ((YamlScalarNode)child.Key).Value.ToUpperInvariant();
switch (key)
{
case "WIDTH":
width = ParseInt(child.Value);
break;
case "HEIGHT":
height = ParseInt(child.Value);
break;
case "FIELD-OF-VIEW":
fieldOfView = ParseFloat(child.Value);
break;
case "FROM":
from = ParsePoint(child.Value);
break;
case "TO":
to = ParsePoint(child.Value);
break;
case "UP":
up = ParseVector(child.Value);
break;
case "ADD": break;
default:
throw new Exception($"Camera attribute {key} not supported (line {child.Key.Start.Line})");
}
}
var cameraTransform = ViewTransform.Create(from, to, up);
return(new Camera(width, height, fieldOfView, cameraTransform));
}
public void CreateArbitrary()
{
var from = new Point(1, 3, 2);
var to = new Point(4, -2, 8);
var up = new Vector(1, 1, 0);
var expected = new Matrix4x4(
-0.50709f, 0.50709f, 0.67612f, -2.36643f,
0.76772f, 0.60609f, 0.12122f, -2.82843f,
-0.35857f, 0.59761f, -0.71714f, 0,
0, 0, 0, 1);
var actual = ViewTransform.Create(from, to, up);
Assert.Equal(expected, actual);
}