// public double rayDepth;
public Material(SColor color)
{
this.color = color;
this.ambient = .1; // making default ambient value to be 1
this.reflectionCoefficient = .3;
//this.specularCoefficient = .3; // .5
this.smoothness = 50; // 50
this.diffuseCoefficient = .3; // .4
//this.rayDepth = 10;
}
public Material(SColor color, double ambient, double reflectionCoefficient, double specularCoefficient) : this(color) {
this.ambient = ambient;
this.reflectionCoefficient = reflectionCoefficient;
this.specularCoefficient = specularCoefficient;
}
public Material(SColor color, double ambient, double reflectionCoefficient) : this(color)
{
this.ambient = ambient; // making ambient to be optional and assigning it's default value
this.reflectionCoefficient = reflectionCoefficient;
}
//constructor initializer list
public Material(SColor color, double ambient) : this(color) {
this.ambient = ambient; // making ambient to be optional and assigning it's default value
}
public SColor color2; // assigning different colors for fantastic stripes
public Stripes(SColor color1, SColor color2) : base(color1)
{
this.color2 = color2;
}
public Light(Vector location, double Intensity, SColor lightColor)
{
this.location = location;
this.Intensity = Intensity;
this.lightColor = lightColor;
}
public void Render(Scene scene, Bitmap bmp)
{
//creating a array for storing different types of combinations for jittered sampling
double[] possibleCombinations = new double[numberOfJittered];
//if jittered is given then only it will push variables to the array
if (numberOfJittered > 1)
{
for (int l = 0; l < numberOfJittered; l++)
{
possibleCombinations[l] = (double)(2 * l + 1) / (numberOfJittered * 2);
}
}
// getting the color of the
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
// for getting random values from 0 to 1 for super sampling or random sampling
Random randomNumber = new Random();
// creating one empty color space for averaging the color for that pixel in multi sampling
SColor samplingColor = new SColor();
//giving background color as black at first
bmp.SetPixel(j, i, Color.FromArgb(255, 0, 0, 0));
//this is the loop for anti-aliasing(AA) that is number of samples
if (numberOfJittered > 1)
{
numberOfSamples = (int)Math.Pow(numberOfJittered, 2);
}
double dz = (height / 2) / (Math.Tan(Algebra.convertToRad(fov * 0.5))); // calculating dz
if (DOFUsed)
{
pixelSize = focalLength / dz;
}
else
{
pixelSize = 1 / dz;
}
Vector pointInThePixel = (new Vector((-width / 2), (height / 2), 0) + new Vector(0.5, -0.5, 0) + new Vector(j, -i, position.z)) * pixelSize; // changing the basis i.e. in terms of i and j of the image
Double wOffset = 1;
if (DOFUsed)
{
wOffset = focalLength;
}
for (int k = 0; k < numberOfSamples; k++)
{
Ray ray = new Ray(position, new Vector());
//checking number of jittered is given or not through it's default value
//that is if number of jittered is not given than calculating as usual number of sampling way
//otherwise that is if number of jittered is given than calculating number of jitterd out of it and checking through midpoints of those number of samples of each pixel
if (numberOfJittered == 1)
{
double m = randomNumber.NextDouble(); // gives random number between 0 and 1
////
//Vector coordinate = new Vector((-width / 2), (height / 2), 0) + new Vector(0.5, -0.5, 0) + new Vector(j, -i, position.z); // changing the basis i.e. in terms of i and j of the image
////
//if number of samplings is 1 then here the value of m will be 0.5 otherwise it will be m which is the random number from 0 to 1
double dx = (j - (width / 2) + (numberOfSamples == 1 ? 0.5 : m)) * pixelSize; // calculating dx
double dy = (((height / 2) - i) + (numberOfSamples == 1 ? 0.5 : m)) * pixelSize; // calculating dy
//double dz = 1;// (height / 2) / (Math.Tan(Algebra.convertToRad(fov * 0.5))); // calculating dz
pointInThePixel = new Vector(dx, dy, wOffset);
ray.direction = convertCameraToWorldCoordinates(pointInThePixel).Normalize(); // so vector (dx, dy, dz) will be the direction of the ray which is normalized
}
else
{
int kX = (k % numberOfJittered); // this is for finding the index of the array for giving possible value of mid points of jittered grid
int kY = (k / numberOfJittered); // this is for finding the next index of the array for giving possible value pf mid points of jittered grid
//Debug.Assert(kX == 0.25);
double dx = j - (width / 2) + (numberOfSamples == 1 ? 0.5 : possibleCombinations[kX]); // calculating dx where possible combination is given by indexing the array
double dy = ((height / 2) - i) + (numberOfSamples == 1 ? 0.5 : possibleCombinations[kY]); // calculating dy
//double dz = 1;// (height / 2) / (Math.Tan(Algebra.convertToRad(fov * 0.5))); // calculating dz
ray.direction = convertCameraToWorldCoordinates(new Vector(dx, dy, 1)).Normalize(); // so vector (dx, dy, dz) will be the direction of the ray which is normalized
}
if (DOFUsed)
{
ray = FindDOFRay(pointInThePixel);
}
// adding all the color of the samples that is given for multi sampling
samplingColor += TraceRay(ray, scene, 0);
}
//taking the average of the color of those all samples
SColor colorSampling = samplingColor / numberOfSamples;
//now giving that average color of all those samples
bmp.SetPixel(j, i, Color.FromArgb(colorSampling.GetAlphaColor(), colorSampling.GetRedColor(), colorSampling.GetGreenColor(), colorSampling.GetBlueColor()));
}
}
}
SColor TraceRay(Ray ray, Scene scene, int rayDepth)
{
int maximumNumberOfReflections = 10;
if (rayDepth >= maximumNumberOfReflections)
{
return(new SColor(0, 0, 0, 0));
}
SColor shapeColor = new SColor();
SColor reflectionColor = new SColor();
SColor averageReflectionColor = new SColor();
Shape closestShape = scene.shapes[0]; // rendering multiple objects so searching for the closest shape to render
double closestT = double.MaxValue; // shape which has closest T need to be rendered at first
foreach (Shape shape in scene.shapes)
{
//transforming the ray origin along with the given tranformation matrices
// origin is transformed like the point tranformation whereas ray direction is transformed like the vector transformation
Vector newOrigin = FindNewPoint(shape.inverseTransformMatrix, ray.origin);
Vector newDirection = (shape.inverseTransformMatrix * ray.direction).Normalize();
double t = shape.DoesIntersect(newOrigin, newDirection); // passing transformed origin and transformed direction
if ((t < closestT) && (t >= 0.0001))
{
closestT = t;
closestShape = shape;
}
}
Vector closeOrigin = FindNewPoint(closestShape.inverseTransformMatrix, ray.origin);
Vector closeDirection = (closestShape.inverseTransformMatrix * ray.direction).Normalize();
if (closestShape.DoesIntersect(closeOrigin, closeDirection) >= 0) // checking whether the ray hits the sphere or not
{
Vector point = closeOrigin + (closeDirection * closestT); // point of intersection
SColor color = closestShape.material.ColorAtPoint(point);
double ambient = closestShape.material.ambient;
double specularCoefficient = closestShape.material.specularCoefficient;
SColor lightContribution = new SColor();
//transforming the point of intersection according to the transformation matrices
point = FindNewPoint(closestShape.transformMatrix, point);
Vector normal = closestShape.NormalAtPoint(point);
// also transforming the normal of the shapes according to the transformation matrix
normal = Matrix4By4.Transpose(closestShape.inverseTransformMatrix) * normal;
// for multiple lighting
foreach (Light light in scene.lights)
{
// for also checking shadows
Vector shadowRayDirection = (light.location - point).Normalize(); // calculating the direction of the ray of the shadow
// at first assigning inShadow variable boolean value false so that we can check whether any shape is in shadow or not
bool inShadow = false;
foreach (Shape shape in scene.shapes)
{
//checking whether each shape is in shadow or not
// also checking whether the distance from the point of intersection and the direction of the ray is greater than the ray intersection distance
//transforming the ray origin along with the given tranformation matrices
Vector transformedShadowRayDirection = (shape.inverseTransformMatrix * shadowRayDirection).Normalize();
if (shape.DoesIntersect(point + (normal * 0.5), transformedShadowRayDirection) >= 0 && Math.Abs((light.location - point).Magnitude()) > shape.DoesIntersect(position, closeDirection))
{
inShadow = true;
break; // giving break point if it's in in shadow
}
}
if (inShadow)
{
continue; // if it's in shadow than continuing that is casting a shadow
}
Vector lightToPoint = point - light.location; // position vector from light to point of intersection
Vector lightDriection = lightToPoint.Normalize(); // and then normalizing it to get the direction of that vector
double cosineAngle = -(lightDriection * normal); // finding the scalar value which gives the light intensity
if (cosineAngle < 0)
{
cosineAngle = 0;
}
// for specular highlight
Vector cameraToIntersectionPoint = (position - point).Normalize();
Vector reflectedRayDirection = (closestShape.material.ReflectedRay(ray.origin, ray.direction, closestShape).direction).Normalize();
//averageReflectionColor = reflectionColor * (1 / rayDepth);
//color = averageReflectionColor + color;
double specularFactor = Math.Pow((cameraToIntersectionPoint * reflectedRayDirection), closestShape.material.smoothness);
if (specularFactor < 0)
{
specularFactor = 0;
}
if (cosineAngle >= 0 || specularFactor >= 0)
{
lightContribution = lightContribution + (light.lightColor * color * (cosineAngle * closestShape.material.diffuseCoefficient + specularFactor * closestShape.material.specularCoefficient) * light.Intensity);
}
}
/*
* if (rayDepth < maximumNumberOfReflections)
* {
* Ray reflectedRay = closestShape.material.ReflectedRay(closeOrigin, closeDirection, closestShape);
* reflectionColor = TraceRay(reflectedRay, scene, rayDepth + 1); // recursive method
* }
*/
shapeColor = lightContribution + (color * ambient);
}
return(shapeColor + closestShape.material.reflectionCoefficient * reflectionColor);
}
