public static Color ShadeHit(World w, Computation comps, int remaining = 5)
{
var surface = Color.Black;
foreach (var Light in w.Lights)
{
var shadowed = Light.IsShadowed(w, comps.OverPoint);
surface += Light.Lighting(
comps.Object.Material,
comps.Object,
Light,
comps.Point,
comps.EyeV,
comps.NormalV,
shadowed);
}
var reflected = w.ReflectedColor(comps, remaining);
var refracted = w.RefractedColor(comps, remaining);
var material = comps.Object.Material;
if (material.Reflective > 0 && material.Transparency > 0)
{
var reflectance = comps.Schlick();
return(surface
+ reflected * reflectance
+ refracted * (1 - reflectance));
}
else
{
return(surface + reflected + refracted);
}
}
public void LightingWithPatternApplied()
{
var m = new RTF.Material
{
Pattern = Pattern.GetStripePattern(RTF.Color.White, RTF.Color.Black),
Ambient = 1,
Diffuse = 0,
Specular = 0
};
var eyev = pt.Vector(0, 0, -1);
var normalv = pt.Vector(0, 0, -1);
var light = new RTF.Light(pt.Point(0, 0, -10), RTF.Color.White);
var c1 = light.Lighting(m, new shapes.Sphere(), pt.Point(0.9, 0, 0), eyev, normalv, false);
var c2 = light.Lighting(m, new shapes.Sphere(), pt.Point(1.1, 0, 0), eyev, normalv, false);
Assert.Equal(RTF.Color.White, c1);
Assert.Equal(RTF.Color.Black, c2);
}
public void LightingWithEyeBehindSurface()
{
var m = new RTF.Material();
var position = pt.Point(0, 0, 0);
var eyeVector = pt.Vector(0, 0, -1);
var normalVector = pt.Vector(0, 0, -1);
var light = new RTF.Light
(pt.Point(0, 0, 10), new RTF.Color(1, 1, 1));
var result = light.Lighting(m, new Sphere(), position, eyeVector, normalVector, false);
Assert.Equal(new RTF.Color(0.1, 0.1, 0.1), result);
}
public void LightingWithEyePathReflection()
{
var m = new RTF.Material();
var position = pt.Point(0, 0, 0);
var eyeVector = pt.Vector(0, -Math.Sqrt(2) / 2, -Math.Sqrt(2) / 2);
var normalVector = pt.Vector(0, 0, -1);
var light = new RTF.Light
(pt.Point(0, 10, -10), new RTF.Color(1, 1, 1));
var result = light.Lighting(m, new Sphere(), position, eyeVector, normalVector, false);
CustomAssert.Equal(new RTF.Color(1.6364, 1.6364, 1.6364), result, 4);
}
public void LightingWithEyeOppositeSurfaceOffset45()
{
var m = new RTF.Material();
var position = pt.Point(0, 0, 0);
var eyeVector = pt.Vector(0, 0, -1);
var normalVector = pt.Vector(0, 0, -1);
var light = new RTF.Light
(pt.Point(0, 10, -10), new RTF.Color(1, 1, 1));
var result = light.Lighting(m, new Sphere(), position, eyeVector, normalVector, false);
CustomAssert.Equal(new RTF.Color(0.7364, 0.7364, 0.7364), result, 4);
}
public void LightingWithEyeBetweenLightSurfaceOffset45()
{
var m = new RTF.Material();
var position = pt.Point(0, 0, 0);
var eyeVector = pt.Vector(0, Math.Sqrt(2) / 2, -Math.Sqrt(2) / 2);
var normalVector = pt.Vector(0, 0, -1);
var light = new RTF.Light
(pt.Point(0, 0, -10), new RTF.Color(1, 1, 1));
var result = light.Lighting(m, new Sphere(), position, eyeVector, normalVector, false);
Assert.Equal(new RTF.Color(1, 1, 1), result);
}
public void LightingSurfaceShadow()
{
var m = new RTF.Material();
var position = p.Point(0, 0, 0);
var eyeV = p.Vector(0, 0, -1);
var normalV = p.Vector(0, 0, -1);
var light = new RTF.Light(p.Point(0, 0, -10), RTF.Color.White);
var inShadow = true;
var result = light.Lighting(m, new Sphere(), position, eyeV, normalV, inShadow);
var expected = new RTF.Color(0.1, 0.1, 0.1);
Assert.Equal(expected, result);
}
