public override Color3 colorNormal(Color3 existing, Ray r, Hit h, Shape s, Light bulb)
{
switch (shader)
{
case ProcShading.Circle:
return mapCircle(h);
case ProcShading.Texture:
return mapTexture(h);
default:
return mapSquare(h);
}
}
// spawn a shadow ray from the intersection point to the light source.
private static bool spawnShadow(Light bulb, Hit finalHit, Shape hitShape, Shape fromShape)
{
Ray shadowRay = new Ray();
shadowRay.start = finalHit.intersect;
shadowRay.direction = Point3.vectorize(shadowRay.start, bulb.Location);
double shadowDist = Point3.distance(shadowRay.start, bulb.Location);
foreach (Shape s in layout.Shapes)
{
// If this is the object we're checking from, ignore. Duh.
if (s.Equals(hitShape) || s.Equals(fromShape) || s.Material.Kt > 0)
continue;
Hit shadowHit = s.intersect(shadowRay);
if (shadowHit.intersect.z == Constants.FAR_AWAY)
continue;
// We need to check if hitShape object is in FRONT OF the current one. if it is, we need to ignore this current shape.
Vector3 frontTest = Point3.vectorize(shadowHit.intersect, finalHit.intersect);
if (frontTest.X > 0 && frontTest.Y > 0 && frontTest.Z > 0)
continue;
// something has to come between the light and the current shape.
double shapeDist = Point3.distance(shadowRay.start, shadowHit.intersect);
if (shapeDist < shadowDist)
{
return true;
}
}
return false;
}
public override Color3 colorNormal(Color3 existing, Ray r, Hit h, Shape s, Light bulb)
{
return Color3.Black;
}
public abstract Color3 colorNormal(Color3 existing, Ray r, Hit h, Shape s, Light bulb);
public static Color3 specular(Ray r, Hit h, Shape s, Light bulb)
{
Color3 specular = Black;
Vector3 normal = s.calcNormal(h);
Vector3 lightDir = Point3.vectorize(bulb.Location, h.intersect);
Vector3 refDir = lightDir - (2 * (Vector3.DotProduct(lightDir, normal) / Math.Pow(normal.Abs(), 2)) * normal);
double specularDot = Vector3.DotProduct(r.direction, refDir);
if (specularDot >= 0)
specular = (bulb.Color * s.Material.Specular) * Math.Pow(specularDot, s.Material.Ke);
return specular;
}
public static Color3 diffuse(Hit h, Shape s, Light bulb)
{
Color3 diffuse = Black;
Vector3 normal = s.calcNormal(h);
Vector3 lightDir = Point3.vectorize(bulb.Location, h.intersect);
double diffuseDot = Vector3.DotProduct(lightDir, normal);
if (diffuseDot >= 0)
diffuse = (bulb.Color * s.Material.Diffuse) * diffuseDot;
return diffuse;
}