protected Vector CalculateW(Vector eye, Vector target)
{
// -(t - e)
Vector gazeDirection = eye - target;
gazeDirection.Normalize3();
return gazeDirection;
}
public Ray(Vector eye, Vector rayDirection)
{
this.start = eye;
this.direction = rayDirection;
useBounds = false;
maximumTravelDistance = float.MaxValue;
}
public Fragment(Fragment v1, Fragment v2, float t)
{
this.RasterizedPosition = v1.RasterizedPosition + t * (v2.RasterizedPosition - v1.RasterizedPosition);
this.Normal = v1.Normal + t * (v2.Normal - v1.Normal);
this.U = v1.U + t * (v2.U - v1.U);
this.V = v1.V + t * (v2.V - v1.V);
}
public RenderingParameters()
{
MaxTime = 3.0f;
Height = 500;
Width = 500;
MinTextureMode = SceneTextureMode.Nearest;
MagTextureMode = SceneTextureMode.Nearest;
RenderMode = SceneRenderMode.Normal;
ShadeMode = ShadingMode.PixelPhong;
BackgroundColor = new Vector(0,0,0);
EnablePersepctiveCorrected = true;
EnableShading = true;
EnableReflections = true;
EnableRefractions = true;
EnableShadows = true;
EnableAttenuation = true;
EnableAntialias = true;
EnableParallelization = false;
EnableDepthOfField = false;
EnableTestDepth = true;
EnableFustrumCulling = true;
EnableMultipleLights = true;
EnableSoftShadows = false;
EnableMotionBlur = true;
EnableTextureMapping = true;
PixelSize = 1;
}
public HitRecord()
{
ObjectName = "";
Distance = float.MaxValue;
Material = new SceneMaterial();
TextureColor = new Vector();
ShadedColors = new List<Vector>();
}
public static float[] GetVector3Array(Vector v)
{
float[] array = new float[3];
array[0] = v.x;
array[1] = v.y;
array[2] = v.z;
return array;
}
public Vector ShowColor(Vector position)
{
Vector color = buffer[(int)position.x, (int)position.y];
Console.WriteLine(color);
//buffer[(int)position.x, (int)position.y] = new Vector(0, 0, 0);
Glut.glutPostRedisplay();
return color;
}
public Ray(Vector eye, Vector rayDirection, Vector cameraLookDirection, float near, float far)
{
this.start = eye;
this.cameraLookDirection = cameraLookDirection;
this.direction = rayDirection;
useBounds = true;
maximumTravelDistance = float.MaxValue;
}
public bool IsCap(Vector capPoint, Vector intersection)
{
Vector diff = capPoint - intersection;
float radius = Vector.Dot3(diff, diff);
if (radius > this.Radius*this.Radius)
return false;
else
return true;
}
public static Vector operator *(Matrix M, Vector v)
{
float x = M[0,0] * v.x + M[0,1] * v.y + M[0,2] * v.z + M[0,3] * v.w;
float y = M[1, 0] * v.x + M[1, 1] * v.y + M[1, 2] * v.z + M[1, 3] * v.w;
float z = M[2, 0] * v.x + M[2, 1] * v.y + M[2, 2] * v.z + M[2, 3] * v.w;
float w = M[3, 0] * v.x + M[3, 1] * v.y + M[3, 2] * v.z + M[3, 3] * v.w;
Vector transformedVector = new Vector(x, y, z, w);
return transformedVector;
}
public Matrix(Vector[] colVectors)
{
data = new float[MATRIX_SIZE * MATRIX_SIZE];
for (int row = 0; row < MATRIX_SIZE; ++row)
{
for (int col = 0; col < MATRIX_SIZE; ++col)
{
data[row * MATRIX_SIZE + col] = colVectors[col][row];
}
}
}
protected void DrawSquare(Vector topLeft, Vector color, int width)
{
for (int x = (int)topLeft.x; x < topLeft.x + width; ++x)
{
if (x < 0 || x >= rendParams.Width)
continue;
for (int y = (int)topLeft.y; y < topLeft.y + width; ++y)
{
if (x < 0 || x >= rendParams.Height)
continue;
buffer[x, y] = color;
}
}
}
public void Initialize(List<Vector> vertex)
{
triangles = new SceneTriangle[2];
Vector center = new Vector();
foreach (Vector v in vertex)
center += v;
center = center / 4.0f;
this.Center = center;
this.PlaneNormal = Vector.Cross3(vertex[1] - vertex[0], vertex[2] - vertex[0]);
this.PlaneNormal.Normalize3();
SceneTriangle t1 = new SceneTriangle();
SceneTriangle t2 = new SceneTriangle();
triangles[0] = t1;
triangles[1] = t2;
t1.Vertex = new List<Vector>();
t2.Vertex = new List<Vector>();
t1.Vertex.Add(vertex[0]);
t1.Vertex.Add(vertex[1]);
t1.Vertex.Add(vertex[2]);
t2.Vertex.Add(vertex[2]);
t2.Vertex.Add(vertex[3]);
t2.Vertex.Add(vertex[0]);
t1.Materials = new List<SceneMaterial>();
t2.Materials = new List<SceneMaterial>();
t1.U = new List<float>();
t2.U = new List<float>();
t1.V = new List<float>();
t2.V = new List<float>();
for (int i = 0; i < 3; i++)
{
t1.Materials.Add(this.material);
t2.Materials.Add(this.material);
t1.U.Add(0);
t1.V.Add(0);
t2.U.Add(0);
t2.V.Add(0);
}
this.Vertex = vertex;
}
protected Vector CalculateV(Vector w, Vector u)
{
Vector v = Vector.Cross3(w, u);
return v;
}
protected Vector CalculateU(Vector up, Vector w)
{
Vector u = Vector.Cross3(up, w);
u.Normalize3();
return u;
}
public bool IsInside(Vector point)
{
float insideBase = Vector.Dot3(HeightDirection, point - this.BasePoint);
float insideEnd = Vector.Dot3(HeightDirection, point - this.EndPoint);
if (insideBase < 0 || insideEnd > 0)
return false;
else
return true;
}
public Vector PlaneNormal(Vector point, Vector cameraDirection)
{
Vector normal = this.HeightDirection;
float similarity = Vector.Dot3(normal, -cameraDirection);
if (similarity < 0)
{
normal = -normal;
}
return normal;
}
public override Vector SurfaceNormal(Vector point, Vector cameraDirection)
{
Vector center = Vector.Dot3(point - this.BasePoint, this.HeightDirection) * this.HeightDirection + this.BasePoint;
Vector normal = point - center;
normal.Normalize3();
float similarity = Vector.Dot3(normal, -cameraDirection);
if (similarity < 0)
{
normal = -normal;
}
return normal;
}
public override Vector SurfaceNormal(Vector point, Vector eyeDirection)
{
throw new NotImplementedException();
}
public static void DrawPixel(Vector position, Vector color)
{
Gl.glColor4f(color.x, color.y, color.z, color.w);
Gl.glVertex2i((int)position.x, (int)position.y);
}
public Vector GetTexturePixelColor(int x, int y)
{
if (TextureImage == null)
return null;
Vector color;
lock (lockObject)
{
Color c = TextureImage.GetPixel(x, y);
color = new Vector(c.R / 255.0f, c.G / 255.0f, c.B / 255.0f, c.A / 255.0f);
}
return color;
}
public SceneMaterial()
{
Specular = new Vector(0, 0, 0);
Diffuse = new Vector(0, 0, 0);
Reflective = new Vector(0, 0, 0);
RefractionIndex = new Vector(0, 0, 0);
Refractiveness = new Vector();
}
public override Vector SurfaceNormal(Vector point, Vector eyeDirection)
{
return -1.0f*base.SurfaceNormal(point, eyeDirection);
}
public static Vector LightAdd(Vector v1, Vector v2)
{
Vector result = new Vector();
result.x = Math.Min(1.0f, v1.x + v2.x);
result.y = Math.Min(1.0f, v1.y + v2.y);
result.z = Math.Min(1.0f, v1.z + v2.z);
result.w = 1.0f;
return result;
}
/// <summary>
/// Dot product of a 3-dimensional vector
/// </summary>
/// <param name="v1"></param>
/// <param name="v2"></param>
/// <returns></returns>
public static float Dot3(Vector v1, Vector v2)
{
return v1.x * v2.x + v1.y * v2.y + v1.z * v2.z;
}
/// <summary>
/// Element by element multiplication of vectors. Useful for light calculations.
/// </summary>
/// <param name="v1"></param>
/// <param name="v2"></param>
/// <returns></returns>
public static Vector ColorMultiplication(Vector v1, Vector v2)
{
Vector result = new Vector();
result.x = v1.x * v2.x;
result.y = v1.y * v2.y;
result.z = v1.z * v2.z;
result.w = 1.0f;
return result;
}
public Vector CalculatePixel(int screenX, int screenY)
{
//Console.WriteLine("Drawing pixel " + screenX + ", " + screenY);
//Naturally, we would have to trace rays in order to find collisions.
Vector eye = scene.Camera.Position;
// Console.WriteLine("Eye: " + eye);
Vector target = scene.Camera.Target;
// Console.WriteLine("Target: " + target);
Vector up = scene.Camera.Up;
//Console.WriteLine("up: " + up);
//Use radians
float fov = (float)Math.PI * (scene.Camera.FieldOfView / 180.0f);
float near = scene.Camera.NearClip;
//float far = scene.Camera.FarClip;
float far = float.MaxValue;
Vector w = CalculateW(eye, target);
Vector u = CalculateU(up, w);
Vector v = CalculateV(w, u);
float tanAngle = (float)Math.Tan(fov / 2.0);
float top = tanAngle * near;
float bottom = -top;
float aspectRatio = width / height;
float left = aspectRatio * bottom;
float right = -left;
int subPixelLevel = 2;
int cellsPerRow = 2 << (subPixelLevel - 1);
double cellWidth = 1.0 / (double)cellsPerRow;
Vector averageColor = new Vector();
float totalSamples = cellsPerRow * cellsPerRow;
if (renderingParameters.EnableAntialias)
{
for (int i = 0; i < cellsPerRow; i++)
{
double startX = screenX + i * cellWidth;
for (int j = 0; j < cellsPerRow; j++)
{
double startY = screenY + j * cellWidth;
float sampleX = (float)(startX + GenerateRandom() * cellWidth);
float sampleY = (float)(startY + GenerateRandom() * cellWidth);
float uCoord = (sampleX + 0.5f) * (right - left) / width + left;
float vCoord = (sampleY + 0.5f) * (top - bottom) / height + bottom;
float wCoord = -near;
//(x,y) -> (u, v, w)
//Sij es con respecto a la posición de la cámara
Vector Sij = uCoord * u + vCoord * v + wCoord * w;
Vector rayStart = eye;
Vector rayDirection = Sij;
List<SceneLight> lights = scene.Lights;
rayDirection.Normalize3();
Ray ray = new Ray(rayStart, rayDirection, w, near, far);
float currentTime = (float)GenerateRandom() * renderingParameters.MaxTime;
ray.Time = currentTime;
averageColor = averageColor + CalculateColor(ray, near, far, 0, 0, 1.0f);
}
}
}
else
{
float uCoord = (screenX + 0.5f) * (right - left) / width + left;
float vCoord = (screenY + 0.5f) * (top - bottom) / height + bottom;
float wCoord = -near;
//(x,y) -> (u, v, w)
//Sij es con respecto a la posición de la cámara
Vector Sij = uCoord * u + vCoord * v + wCoord * w;
Vector rayStart = eye;
Vector rayDirection = Sij;
List<SceneLight> lights = scene.Lights;
rayDirection.Normalize3();
float currentTime = (float)GenerateRandom() * renderingParameters.MaxTime;
Ray ray = new Ray(rayStart, rayDirection, w, near, far);
ray.Time = currentTime;
Vector finalColor = CalculateColor(ray, near, far, 0, 0, 1.0f);
return finalColor;
}
averageColor = averageColor / totalSamples;
return averageColor;
}
//Interpolation
public Vector GetTexturePixelColor(float u, float v)
{
if (TextureImage == null)
return null;
Vector color = new Vector();
lock (lockObject)
{
float x = u * (TextureImage.Width - 1);
float y = v * (TextureImage.Height - 1);
float left = (float)Math.Floor(x);
float right = (float)Math.Ceiling(x);
float top = (float)Math.Floor(y);
float bottom = (float)Math.Ceiling(y);
float deltaX = x - left;
float deltaY = y - top;
Color c1, c2, c3, c4;
c1 = TextureImage.GetPixel((int)left, (int)top);
c2 = TextureImage.GetPixel((int)right, (int)top);
c3 = TextureImage.GetPixel((int)left, (int)bottom);
c4 = TextureImage.GetPixel((int)right, (int)bottom);
Vector v1 = new Vector(c1);
Vector v2 = new Vector(c2);
Vector v3 = new Vector(c3);
Vector v4 = new Vector(c4);
Vector topColor = v1 * (1 - deltaX) + v2 * deltaX;
Vector bottomColor = v3 * (1 - deltaX) + v4 * deltaX;
color = topColor * (1 - deltaY) + bottomColor * deltaY;
//color = new Vector(c.R / 255.0f, c.G / 255.0f, c.B / 255.0f, c.A / 255.0f);
}
return color;
}
public static Vector Cross3(Vector v1, Vector v2)
{
Vector crossVec = new Vector();
crossVec.x = v1.y * v2.z - v2.y * v1.z;
crossVec.y = v2.x * v1.z - v1.x * v2.z;
crossVec.z = v1.x * v2.y - v2.x * v1.y;
crossVec.w = 0.0f;
return crossVec;
}
public override Vector SurfaceNormal(Vector point, Vector eyeDirection)
{
Vector surfaceNormal = point - this.Center;
surfaceNormal.Normalize3();
float similarity = Vector.Dot3(surfaceNormal, -eyeDirection);
if (similarity < 0)
{
surfaceNormal = -surfaceNormal;
}
return surfaceNormal;
}
