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);
}
}
public override Color3 colorShadow(Color3 existing, Hit h, double factor)
{
switch (shader)
{
case ProcShading.Circle:
return Color3.shade(mapCircle(h), factor);
case ProcShading.Texture:
return Color3.shade(mapTexture(h), factor);
default:
return Color3.shade(mapSquare(h), factor);
}
}
public override Vector3 calcNormal(Hit h)
{
Vector3 v;
if (normals.TryGetValue(h.intersect, out v))
{
return(v);
}
else
{
v.X = (h.intersect.x - center.x) / radius;
v.Y = (h.intersect.y - center.y) / radius;
v.Z = (h.intersect.z - center.z) / radius;
v.Normalize();
normals.Add(h.intersect, v);
return(v);
}
}
// 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 Hit intersect(Ray r)
{
Hit h = new Hit();
double denominator =
Vector3.DotProduct(normal, r.direction);
if (denominator == 0.0)
{
h.intersect.z = Constants.FAR_AWAY;
}
else
{
double numerator = normal.X * r.start.x +
normal.Y * r.start.y +
normal.Z * r.start.z +
distance;
h.omega = -numerator / denominator;
if (h.omega < 0)
{
h.intersect.z = Constants.FAR_AWAY;
}
else
{
h.intersect.x = r.start.x + r.direction.X * h.omega;
h.intersect.y = r.start.y + r.direction.Y * h.omega;
h.intersect.z = r.start.z + r.direction.Z * h.omega;
// Boundary hit testing.
if (h.intersect.x > Constants.RIGHT_PLANE_BOUNDARY || h.intersect.x < Constants.LEFT_PLANE_BOUNDARY)
{
h.intersect.x = h.intersect.y = h.intersect.z = Constants.FAR_AWAY;
}
}
}
return h;
}
public override Hit intersect(Ray r)
{
Hit h = new Hit();
double denominator =
Vector3.DotProduct(normal, r.direction);
if (denominator == 0.0)
{
h.intersect.z = Constants.FAR_AWAY;
}
else
{
double numerator = normal.X * r.start.x +
normal.Y * r.start.y +
normal.Z * r.start.z +
distance;
h.omega = -numerator / denominator;
if (h.omega < 0)
{
h.intersect.z = Constants.FAR_AWAY;
}
else
{
h.intersect.x = r.start.x + r.direction.X * h.omega;
h.intersect.y = r.start.y + r.direction.Y * h.omega;
h.intersect.z = r.start.z + r.direction.Z * h.omega;
// Boundary hit testing.
if (h.intersect.x > Constants.RIGHT_PLANE_BOUNDARY || h.intersect.x < Constants.LEFT_PLANE_BOUNDARY)
{
h.intersect.x = h.intersect.y = h.intersect.z = Constants.FAR_AWAY;
}
}
}
return(h);
}
public abstract Color3 colorNormal(Color3 existing, Ray r, Hit h, Shape s, Light bulb);
// 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 Hit intersect(Ray r)
{
Hit h = new Hit();
double b = 2 * (r.direction.X * (r.start.x - center.x) +
r.direction.Y * (r.start.y - center.y) +
r.direction.Z * (r.start.z - center.z));
double c = Math.Pow(r.start.x - center.x, 2) +
Math.Pow(r.start.y - center.y, 2) +
Math.Pow(r.start.z - center.z, 2) -
Math.Pow(radius, radius);
double disc = Math.Pow(b, 2) - 4 * c;
if (disc < 0)
{
h.intersect.z = Constants.FAR_AWAY;
}
else
{
h.omega = (-b + Math.Sqrt(disc)) / 2;
h.intersect.x = r.start.x + r.direction.X * h.omega;
h.intersect.y = r.start.y + r.direction.Y * h.omega;
h.intersect.z = r.start.z + r.direction.Z * h.omega;
}
return h;
}
public override Color3 colorNormal(Color3 existing, Ray r, Hit h, Shape s, Light bulb)
{
return Color3.Black;
}
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;
}
public override Color3 colorShadow(Color3 existing, Hit h, double factor)
{
return(Color3.shade(existing, factor));
}
public override Color3 colorNormal(Color3 existing, Ray r, Hit h, Shape s, Light bulb)
{
return(Color3.Black);
}
public override Vector3 calcNormal(Hit h)
{
return(normal);
}
public abstract Color3 colorShadow(Color3 existing, Hit h, double factor);
public abstract Color3 colorShadow(Color3 existing, Hit h, double factor);
public override Vector3 calcNormal(Hit h)
{
Vector3 v;
if (normals.TryGetValue(h.intersect, out v))
{
return v;
}
else
{
v.X = (h.intersect.x - center.x) / radius;
v.Y = (h.intersect.y - center.y) / radius;
v.Z = (h.intersect.z - center.z) / radius;
v.Normalize();
normals.Add(h.intersect, v);
return v;
}
}
public static Color3 floor(Color3 existing, Hit h, Plane p)
{
return Color3.Green;
}
public override Color3 colorShadow(Color3 existing, Hit h, double factor)
{
return Color3.shade(existing, factor);
}
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 override Vector3 calcNormal(Hit h)
{
return normal;
}
private Color3 mapCircle(Hit h)
{
Color3 shadeColor;
const double SPHERESIZE = Constants.SPHERESIZE;
int row = (int)Math.Round(h.intersect.x / SPHERESIZE);
int col = (int)Math.Round(h.intersect.z / SPHERESIZE);
double centerX = row * SPHERESIZE + SPHERESIZE / 4;
double centerY = col * SPHERESIZE + SPHERESIZE / 4;
double r = SPHERESIZE / 4;
if (h.intersect.x <= centerX + r && h.intersect.x >= centerX - r &&
h.intersect.z <= centerY + r && h.intersect.z >= centerY - r)
{
double circle = Math.Pow(h.intersect.x - centerX, 2) + Math.Pow(h.intersect.z - centerY, 2);
if (circle <= Math.Pow(r, 2))
shadeColor = Color3.Yellow;
else
shadeColor = Color3.Red;
}
else
{
shadeColor = Color3.Red;
}
return shadeColor;
}
private Color3 mapSquare(Hit h)
{
Color3 shadeColor;
int row = (int)Math.Round(h.intersect.x / Constants.CHECKSIZE);
int col = (int)Math.Round(h.intersect.z / Constants.CHECKSIZE);
if (row % 2 == 0 && col % 2 == 0)
shadeColor = Color3.Red;
else if (row % 2 == 0)
shadeColor = Color3.Yellow;
else if (col % 2 == 0)
shadeColor = Color3.Yellow;
else
shadeColor = Color3.Red;
return shadeColor;
}
private Color3 mapTexture(Hit h)
{
Color3 shadeColor = Color3.Black;
int texWidth = TextureLoader.Texture.Width;
int texHeight = TextureLoader.Texture.Height;
int row = (int)Math.Round(h.intersect.x / texWidth);
int col = (int)Math.Round(h.intersect.z / texHeight);
int startX = row * texWidth;
int startY = col * texHeight;
int texX = (int) Math.Round(Math.Abs(h.intersect.x - startX));
int texY = (int) Math.Round(Math.Abs(h.intersect.z - startY));
if (texX < TextureLoader.Texture.Width && texY < TextureLoader.Texture.Height)
{
System.Drawing.Color texColor = TextureLoader.Texture.GetPixel(texX, texY);
shadeColor = new Color3(texColor.R, texColor.G, texColor.B);
}
return shadeColor;
}
public static Color3 floor(Color3 existing, Hit h, Plane p)
{
return(Color3.Green);
}
public abstract Vector3 calcNormal(Hit h);
private static Color3 fireRay(Ray incomingRay, int depth, Shape fromShape)
{
double closest = Constants.FAR_AWAY;
Color3 retColor = Constants.BGCOLOR;
int whichObject = 0, hitObject = 0;
Hit finalHit = new Hit();
foreach (Shape s in layout.Shapes)
{
Hit rayHit = s.intersect(incomingRay);
whichObject++;
if (rayHit.intersect.z == Constants.FAR_AWAY)
continue;
double dist = Point3.distance(layout.Cam.Eye, rayHit.intersect);
if (dist < closest && !s.Equals(fromShape))
{
closest = dist;
hitObject = whichObject;
finalHit = rayHit;
}
}
if (hitObject <= 0)
return Constants.BGCOLOR;
Shape hitShape = layout.Shapes[hitObject - 1];
retColor = Color3.ambient(hitShape);
// phongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphong
Color3 diffuseColor = Color3.Black, specularColor = Color3.Black;
foreach (Light bulb in layout.Lights)
{
if (spawnShadow(bulb, finalHit, hitShape, fromShape))
{
retColor = hitShape.colorShadow(retColor, finalHit, layout.Lights.Count * 3);
}
else
{
if (hitShape is Plane)
{
retColor = hitShape.colorNormal(retColor, incomingRay, finalHit, hitShape, bulb);
}
else
{
diffuseColor += Color3.diffuse(finalHit, hitShape, bulb);
specularColor += Color3.specular(incomingRay, finalHit, hitShape, bulb);
}
}
}
if (hitShape is Sphere)
{
retColor += diffuseColor * hitShape.Material.Kd;
retColor += specularColor * hitShape.Material.Ks;
}
if (depth < Constants.MAX_DEPTH)
{
Color3 reflectColor = Color3.Black;
if (hitShape.Material.Kr > 0)
{
Ray reflectRay = new Ray();
reflectRay.start = finalHit.intersect;
Vector3 normalVec = hitShape.calcNormal(finalHit);
double c = -Vector3.DotProduct(normalVec, incomingRay.direction);
reflectRay.direction = -(incomingRay.direction + (2 * normalVec * c));
reflectRay.direction.Normalize();
reflectColor = fireRay(reflectRay, depth + 1, hitShape);
retColor += reflectColor * hitShape.Material.Kr;
}
if (hitShape.Material.Kt > 0)
{
Ray transRay = new Ray();
double indexRefract;
Vector3 normalVec = Vector3.FaceForward(hitShape.calcNormal(finalHit), -incomingRay.direction);
if (Vector3.DotProduct(-incomingRay.direction, hitShape.calcNormal(finalHit)) < 0)
indexRefract = Constants.REFRACTION_INDEX_SPHERE / Constants.REFRACTION_INDEX_AIR;
else
indexRefract = Constants.REFRACTION_INDEX_AIR / Constants.REFRACTION_INDEX_SPHERE;
double discrim = 1 + (Math.Pow(indexRefract, 2) * (Math.Pow(Vector3.DotProduct(-incomingRay.direction, normalVec), 2) - 1));
// Total internal reflection!
if (discrim < 0)
{
retColor += reflectColor * hitShape.Material.Kt;
}
else
{
discrim = indexRefract * Vector3.DotProduct(-incomingRay.direction, normalVec) - Math.Sqrt(discrim);
transRay.direction = (indexRefract * incomingRay.direction) + (discrim * normalVec);
transRay.start = finalHit.intersect;
Color3 transColor = fireRay(transRay, depth + 1, hitShape);
retColor += transColor * hitShape.Material.Kt;
}
}
}
return retColor;
}
public abstract Color3 colorNormal(Color3 existing, Ray r, Hit h, Shape s, Light bulb);
private static Color3 fireRay(Ray incomingRay, int depth, Shape fromShape)
{
double closest = Constants.FAR_AWAY;
Color3 retColor = Constants.BGCOLOR;
int whichObject = 0, hitObject = 0;
Hit finalHit = new Hit();
foreach (Shape s in layout.Shapes)
{
Hit rayHit = s.intersect(incomingRay);
whichObject++;
if (rayHit.intersect.z == Constants.FAR_AWAY)
{
continue;
}
double dist = Point3.distance(layout.Cam.Eye, rayHit.intersect);
if (dist < closest && !s.Equals(fromShape))
{
closest = dist;
hitObject = whichObject;
finalHit = rayHit;
}
}
if (hitObject <= 0)
{
return(Constants.BGCOLOR);
}
Shape hitShape = layout.Shapes[hitObject - 1];
retColor = Color3.ambient(hitShape);
// phongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphongphong
Color3 diffuseColor = Color3.Black, specularColor = Color3.Black;
foreach (Light bulb in layout.Lights)
{
if (spawnShadow(bulb, finalHit, hitShape, fromShape))
{
retColor = hitShape.colorShadow(retColor, finalHit, layout.Lights.Count * 3);
}
else
{
if (hitShape is Plane)
{
retColor = hitShape.colorNormal(retColor, incomingRay, finalHit, hitShape, bulb);
}
else
{
diffuseColor += Color3.diffuse(finalHit, hitShape, bulb);
specularColor += Color3.specular(incomingRay, finalHit, hitShape, bulb);
}
}
}
if (hitShape is Sphere)
{
retColor += diffuseColor * hitShape.Material.Kd;
retColor += specularColor * hitShape.Material.Ks;
}
if (depth < Constants.MAX_DEPTH)
{
Color3 reflectColor = Color3.Black;
if (hitShape.Material.Kr > 0)
{
Ray reflectRay = new Ray();
reflectRay.start = finalHit.intersect;
Vector3 normalVec = hitShape.calcNormal(finalHit);
double c = -Vector3.DotProduct(normalVec, incomingRay.direction);
reflectRay.direction = -(incomingRay.direction + (2 * normalVec * c));
reflectRay.direction.Normalize();
reflectColor = fireRay(reflectRay, depth + 1, hitShape);
retColor += reflectColor * hitShape.Material.Kr;
}
if (hitShape.Material.Kt > 0)
{
Ray transRay = new Ray();
double indexRefract;
Vector3 normalVec = Vector3.FaceForward(hitShape.calcNormal(finalHit), -incomingRay.direction);
if (Vector3.DotProduct(-incomingRay.direction, hitShape.calcNormal(finalHit)) < 0)
{
indexRefract = Constants.REFRACTION_INDEX_SPHERE / Constants.REFRACTION_INDEX_AIR;
}
else
{
indexRefract = Constants.REFRACTION_INDEX_AIR / Constants.REFRACTION_INDEX_SPHERE;
}
double discrim = 1 + (Math.Pow(indexRefract, 2) * (Math.Pow(Vector3.DotProduct(-incomingRay.direction, normalVec), 2) - 1));
// Total internal reflection!
if (discrim < 0)
{
retColor += reflectColor * hitShape.Material.Kt;
}
else
{
discrim = indexRefract * Vector3.DotProduct(-incomingRay.direction, normalVec) - Math.Sqrt(discrim);
transRay.direction = (indexRefract * incomingRay.direction) + (discrim * normalVec);
transRay.start = finalHit.intersect;
Color3 transColor = fireRay(transRay, depth + 1, hitShape);
retColor += transColor * hitShape.Material.Kt;
}
}
}
return(retColor);
}
public abstract Vector3 calcNormal(Hit h);
