public void Illuminate_WithLightOffsetBy45Degrees_ExpectCorrectIlluminatedColor()
{
//arrange
var color = new Color(1, 1, 1);
var material = new PhongMaterial(color, 0.1, 0.9, 0.9, 200.0);
var illuminatedPoint = new Point3D(0, 0, 0);
var eyeVector = new Vector3D(0, 0, -1);
var normalVector = new Vector3D(0, 0, -1);
var lightPosition = new Point3D(0, 10, -10);
var lightIntensity = new Color(1, 1, 1);
var lightSource = new PointLightSource(lightPosition, lightIntensity);
//act
var illuminatedColor = material.Illuminate(illuminatedPoint, eyeVector, normalVector, lightSource);
//assert
Assert.AreEqual(new Color(0.73639610, 0.73639610, 0.73639610), illuminatedColor);
}
public void Illuminate_WithLightBehindSurface_ExpectNoIllumination()
{
//arrange
var color = new Color(1, 1, 1);
var material = new PhongMaterial(color, 0.1, 0.9, 0.9, 200.0);
var illuminatedPoint = new Point3D(0, 0, 0);
var eyeVector = new Vector3D(0, 0, -1);
var normalVector = new Vector3D(0, 0, -1);
var lightPosition = new Point3D(0, 0, 10);
var lightIntensity = new Color(1, 1, 1);
var lightSource = new PointLightSource(lightPosition, lightIntensity);
//act
var illuminatedColor = material.Illuminate(illuminatedPoint, eyeVector, normalVector, lightSource);
//assert
Assert.AreEqual(new Color(0.1, 0.1, 0.1), illuminatedColor);
}
public void Illuminate_WithLightBehindCameraAndIlluminatedPointInShadow_ExpectAmbientColor()
{
//arrange
var color = new Color(1, 1, 1);
var material = new PhongMaterial(color, 0.1, 0.9, 0.9, 200.0);
var illuminatedPoint = new Point3D(0, 0, 0);
var eyeVector = new Vector3D(0, 0, -1);
var normalVector = new Vector3D(0, 0, -1);
var lightPosition = new Point3D(0, 0, -10);
var lightIntensity = new Color(1, 1, 1);
var lightSource = new PointLightSource(lightPosition, lightIntensity);
var isInShadow = true;
//act
var illuminatedColor = material.Illuminate(illuminatedPoint, eyeVector, normalVector, lightSource, isInShadow);
//assert
Assert.AreEqual(new Color(0.1, 0.1, 0.1), illuminatedColor);
}
