/// <summary>
/// Convierte un modelo en un grafico con determinado material rugoso.
/// </summary>
public static Graphic AsGraphic(this Model model, vec4 diffuse)
{
return new ModelGraphic(model, Material.Rough(diffuse));
}
public static Graphic AsLight(this Model model, vec4 color)
{
return new ModelGraphic(model, EmissiveMaterial.Emissive(color));
}
/// <summary>
/// Crea un material traslucido.
/// </summary>
//modificado para annadir densidad
public static Material Translucent(vec4 diffuse, float shinness, float reflectance, float translucence, float density = 1.8f)
{
return new Material { Diffuse = Images.From(diffuse.ToColor()), Shinness = shinness, Reflectance = reflectance, Translucence = translucence, Density = density, };
}
public static EmissiveMaterial Emissive(vec4 lightColor, float shinness = 0, float reflectance = 0, float translucence = 0, float density = 1.8f, IImage diffuse = null)
{
return new EmissiveMaterial { Diffuse = diffuse ?? Images.From(lightColor.ToColor()), LightColor = lightColor, Shinness = shinness, Reflectance = reflectance, Density = density, Translucence = translucence };
}
public static vec4 BicubicSample(this IImage image, float x, float y)
{
vec4[,] p = new vec4[4, 4];
for (int i = 0; i < p.GetLength(0); i++)
{
for (int j = 0; j < p.GetLength(1); j++)
{
p[i, j] = image[(int)Math.Floor((((y * image.Height - 1) % image.Height) + image.Height)) % image.Height, (int)Math.Floor((((x * image.Width - 1) % image.Width) + image.Width)) % image.Width];
}
}
updateCoefficients(p);
float x2 = x * x;
float x3 = x2 * x;
float y2 = y * y;
float y3 = y2 * y;
return (a00 + a01 * y + a02 * y2 + a03 * y3) +
(a10 + a11 * y + a12 * y2 + a13 * y3) * x +
(a20 + a21 * y + a22 * y2 + a23 * y3) * x2 +
(a30 + a31 * y + a32 * y2 + a33 * y3) * x3;
}
public static void updateCoefficients(vec4[,] p)
{
a00 = p[1, 1];
a01 = -.5f * p[1, 0] + .5f * p[1, 2];
a02 = p[1, 0] - 2.5f * p[1, 1] + 2 * p[1, 2] - .5f * p[1, 3];
a03 = -.5f * p[1, 0] + 1.5f * p[1, 1] - 1.5f * p[1, 2] + .5f * p[1, 3];
a10 = -.5f * p[0, 1] + .5f * p[2, 1];
a11 = .25f * p[0, 0] - .25f * p[0, 2] - .25f * p[2, 0] + .25f * p[2, 2];
a12 = -.5f * p[0, 0] + 1.25f * p[0, 1] - p[0, 2] + .25f * p[0, 3] + .5f * p[2, 0] - 1.25f * p[2, 1] + p[2, 2] - .25f * p[2, 3];
a13 = .25f * p[0, 0] - .75f * p[0, 1] + .75f * p[0, 2] - .25f * p[0, 3] - .25f * p[2, 0] + .75f * p[2, 1] - .75f * p[2, 2] + .25f * p[2, 3];
a20 = p[0, 1] - 2.5f * p[1, 1] + 2 * p[2, 1] - .5f * p[3, 1];
a21 = -.5f * p[0, 0] + .5f * p[0, 2] + 1.25f * p[1, 0] - 1.25f * p[1, 2] - p[2, 0] + p[2, 2] + .25f * p[3, 0] - .25f * p[3, 2];
a22 = p[0, 0] - 2.5f * p[0, 1] + 2 * p[0, 2] - .5f * p[0, 3] - 2.5f * p[1, 0] + 6.25f * p[1, 1] - 5 * p[1, 2] + 1.25f * p[1, 3] + 2 * p[2, 0] - 5 * p[2, 1] + 4 * p[2, 2] - p[2, 3] - .5f * p[3, 0] + 1.25f * p[3, 1] - p[3, 2] + .25f * p[3, 3];
a23 = -.5f * p[0, 0] + 1.5f * p[0, 1] - 1.5f * p[0, 2] + .5f * p[0, 3] + 1.25f * p[1, 0] - 3.75f * p[1, 1] + 3.75f * p[1, 2] - 1.25f * p[1, 3] - p[2, 0] + 3 * p[2, 1] - 3 * p[2, 2] + p[2, 3] + .25f * p[3, 0] - .75f * p[3, 1] + .75f * p[3, 2] - .25f * p[3, 3];
a30 = -.5f * p[0, 1] + 1.5f * p[1, 1] - 1.5f * p[2, 1] + .5f * p[3, 1];
a31 = .25f * p[0, 0] - .25f * p[0, 2] - .75f * p[1, 0] + .75f * p[1, 2] + .75f * p[2, 0] - .75f * p[2, 2] - .25f * p[3, 0] + .25f * p[3, 2];
a32 = -.5f * p[0, 0] + 1.25f * p[0, 1] - p[0, 2] + .25f * p[0, 3] + 1.5f * p[1, 0] - 3.75f * p[1, 1] + 3 * p[1, 2] - .75f * p[1, 3] - 1.5f * p[2, 0] + 3.75f * p[2, 1] - 3 * p[2, 2] + .75f * p[2, 3] + .5f * p[3, 0] - 1.25f * p[3, 1] + p[3, 2] - .25f * p[3, 3];
a33 = .25f * p[0, 0] - .75f * p[0, 1] + .75f * p[0, 2] - .25f * p[0, 3] - .75f * p[1, 0] + 2.25f * p[1, 1] - 2.25f * p[1, 2] + .75f * p[1, 3] + .75f * p[2, 0] - 2.25f * p[2, 1] + 2.25f * p[2, 2] - .75f * p[2, 3] - .25f * p[3, 0] + .75f * p[3, 1] - .75f * p[3, 2] + .25f * p[3, 3];
}
//modificado escogia el color por la pos del punto
private vec4 CalculateIlumination(IntersectionInfo info, Ray r, int depth)
{
Material material = info.ModelGraphic.Material;
//Ver si el material es emisivo
vec4 result = new vec4();
if (material is EmissiveMaterial)
result = ((EmissiveMaterial)material).LightColor;
//Ver si el material es bump
if (material is BumpMaterial)
{
var image = material.Diffuse;
int px = (int)(info.TextureCoordenates.X * (image.Width - 1));
int py = (int)(info.TextureCoordenates.Y * (image.Height - 1));
info.Normal = info.Normal + 10 * (vec3)((BumpMaterial)material).Normals[px, py];
}
//Buscando el color en el punto (se puede variar el modo de Sampling)
vec4 colorOfPoint = material.Diffuse.BilinearSample(info.TextureCoordenates.X, 1-info.TextureCoordenates.Y); ;
//Aporte de la luz ambiental
result += (1 - material.Translucence) * colorOfPoint * Scene.AmbientLight;
#region Aporte de cada luz al punto
foreach (var light in Lights)
{
Ray ray = Ray.FromTo(info.Position, light.Position);
bool eclipsedLight = false;
//Detectar si la luz es eclipsada por otro objeto
foreach (var graphic in Scene.Graphics)
{
IntersectionInfo infoAux;
if (Intersect(ray, graphic, out infoAux)
&& (infoAux.Position - ray.From).Length < (light.Position - ray.From).Length
&& (infoAux.ModelGraphic != light.ModelGraphic)
&& (infoAux.ModelGraphic != info.ModelGraphic))
{
eclipsedLight = true;
break;
}
}
//Procesar el aporte de la luz si no esta eclipsada
if (!eclipsedLight)
{
//este vector tiene la direccion desde el pto a la luz
vec3 lightDirection = (light.Position - info.Position).Normalized;
//Aporte de la reflexion difusa
//la intensidad de la luz es directamente proporcional al coseno del angulo entre el rayo de luz y la normal
result += PutInRange(light.Intensity * colorOfPoint * (vec3.dot(lightDirection, info.Normal)));
//Aporte de la reflexion especular
result += PutInRange(light.Intensity * colorOfPoint * (float)Math.Pow(vec3.dot(info.Normal, lightDirection - r.Direction), material.Shinness));
}
}
#endregion
if (depth > 0)
{
//Aporte de la luz reflejada por otros objetos
Ray reflectionRay = Ray.FromDirection(info.Position, r.Direction - 2 * vec3.dot(r.Direction, info.Normal) * info.Normal);
vec4 reflectionColor = GetRayColor(reflectionRay, depth - 1, false);
result += material.Reflectance * reflectionColor;
//Aporte de la luz refractada
if(material.Translucence > 0)
{
float desc = (float)(1 + (Math.Pow(vec3.dot(-1 * r.Direction, info.Normal), 2) - 1) / Math.Pow(material.Density, 2));
if (desc > 0)
{
vec3 refractionDirection = (r.Direction*(1f/material.Density)) +
((vec3.dot(-1 * r.Direction, info.Normal) * (1f / material.Density)) -
(float) Math.Sqrt(desc))*info.Normal;
Ray refractionRay = Ray.FromDirection(info.Position, refractionDirection);
vec4 refractionColor = GetRayColor(refractionRay, depth - 1, false);
result += material.Translucence *refractionColor;
}
}
}
return PutInRange(result);
}
private vec4 PutInRange( vec4 color)
{
color.X = Math.Min(Math.Max(color.X, 0), 1);
color.Y = Math.Min(Math.Max(color.Y, 0), 1);
color.Z = Math.Min(Math.Max(color.Z, 0), 1);
color.W = Math.Min(Math.Max(color.W, 0), 1);
return color;
}
public static vec4 normalize(vec4 v)
{
float length = v.Length;
if (length == 0)
throw new InvalidOperationException();
return new vec4(v.X / length, v.Y / length, v.Z / length, v.W / length);
}
//modificado
public LightSource(vec3 position, vec4 intensity, ModelGraphic modelGraphicLight)
{
Position = position;
Intensity = intensity;
ModelGraphic = modelGraphicLight;
}
public static float dot(vec4 v1, vec4 v2)
{
return v1.X * v2.X + v1.Y * v2.Y + v1.Z * v2.Z + v1.W * v2.W;
}
public static vec4 cross(vec4 v1, vec4 v2, vec4 v3)
{
throw new NotSupportedException();
}
public SolidImage(vec4 color)
{
this.Color = color;
}
/// <summary>
/// Crea un material diffuse.
/// </summary>
public static Material Rough(vec4 diffuse)
{
return new Material { Diffuse = Images.From(diffuse.ToColor()), Shinness = 0, Reflectance = 0f, Translucence = 0 };
}
/// <summary>
/// Crea un material brilloso
/// </summary>
public static Material Glossy(vec4 diffuse, float shinness, float reflectance)
{
return new Material { Diffuse = Images.From(diffuse.ToColor()), Shinness = shinness, Reflectance = reflectance, Translucence = 0 };
}