public Vector3 Trace(Ray ray, Sphere sphere)
{
Vector3 ambient = new Vector3(0f, 0f, 0f);
Hit hit = new Hit();
if (sphere.Intersect(ray, ref hit, 0.001f))
{
Vector3 lightDir = lightPosition - hit.point;
lightDir.Normalize();
float attenuation = 1f / (lightDir.length * lightDir.length);
Vector3 lightDir2 = lightPosition2 - hit.point;
lightDir2.Normalize();
float attenuation2 = 1f / (lightDir2.length * lightDir2.length);
return(attenuation * DiffuseLighting(hit.normal, lightDir) + attenuation2 * DiffuseLighting2(hit.normal, lightDir2));
}
return(ambient);
}
public override bool Intersect(Ray ray, ref Hit hit, float tmin = 0f, float tmax = float.MaxValue)
{
Vector3 oc = ray.origin - center;
// Le rayon pointe-t-il vers la sphere ?
float b = Vector3.Dot(oc, ray.direction);
// Le rayon est-t-il suffisamment proche ?
float c = Vector3.Dot(oc, oc) - radius * radius;
float discriminant = b * b - c;
if (discriminant > 0f)
{
float sqrD = (float)Math.Sqrt(discriminant);
float t = (-b - sqrD);
if (t < tmax && t > tmin)
{
hit.point = ray.Eval(t);
hit.normal = (hit.point - center);
hit.normal.Normalize();
return(true);
}
t = (-b + sqrD);
if (t < tmax && t > tmin)
{
hit.point = ray.Eval(t);
hit.normal = (hit.point - center);
hit.normal.Normalize();
hit.t = t;
return(true);
}
return(false);
}
else
{
return(false);
}
}
public Vector3 TracePhong(Ray ray, List <AbstractObject> abstractObjects, List <Light> lights)
{
Vector3 color = new Vector3();
bool isFirstLight = true;
List <Hit> hits = new List <Hit>();
List <AbstractObject> objects = new List <AbstractObject>();
List <float> distances = new List <float>();
float minDistance = float.MaxValue;
AbstractObject nearestObj = null;
Hit hit = new RayTracer.Hit();
foreach (AbstractObject obj in abstractObjects)
{
if (obj.Intersect(ray, ref hit, 0.001f))
{
float distance = (hit.point.x - ray.origin.x) * (hit.point.x - ray.origin.x) +
(hit.point.y - ray.origin.y) * (hit.point.y - ray.origin.y) +
(hit.point.z - ray.origin.z) * (hit.point.z - ray.origin.z);
if (distance < minDistance)
{
minDistance = distance;
nearestObj = obj;
}
}
}
if (nearestObj == null)
{
return(color);
}
foreach (Light l in lights)
{
hits.Clear();
objects.Clear();
distances.Clear();
Vector3 dir = (l.point - hit.point);
dir.Normalize();
Ray newRay = new Ray(hit.point, dir);
float distanceLight = (hit.point.x - l.point.x) * (hit.point.x - l.point.x) +
(hit.point.y - l.point.y) * (hit.point.y - l.point.y) +
(hit.point.z - l.point.z) * (hit.point.z - l.point.z);
foreach (AbstractObject obj in abstractObjects)
{
if (obj == nearestObj)
{
continue;
}
Hit h = new Hit();
if (obj.Intersect(newRay, ref h, 0.001f))
{
float distance = (h.point.x - hit.point.x) * (h.point.x - hit.point.x) +
(h.point.y - hit.point.y) * (h.point.y - hit.point.y) +
(h.point.z - hit.point.z) * (h.point.z - hit.point.z);
if (distance > distanceLight)
{
continue;
}
int i = 0;
for (; i < distances.Count && distances[i] < distance; i++)
{
;
}
hits.Insert(i, h);
objects.Insert(i, obj);
distances.Insert(i, distance);
}
}
float intensity = 0;
float specular = 0;
Material mat = nearestObj.material;
if (l.mode == Light.LIGHT_MODE.AMBIANTE || l.mode == Light.LIGHT_MODE.PHONG)
{
//Vector3 ambiant = mat.color * mat.ambiante * l.color * l.intensite;
intensity += mat.ambiante;
//color += ambiant;
}
if (objects.Count > 0)
{
color = l.color * mat.color * l.intensite * intensity;
return(color);
}
if (l.mode == Light.LIGHT_MODE.DIFFUSE || l.mode == Light.LIGHT_MODE.PHONG)
{
Vector3 lightDir = l.point - hit.point;
lightDir.Normalize();
float attenuation = 1f / (lightDir.length * lightDir.length);
float dot = Math.Max(0f, Vector3.Dot(hit.normal, lightDir));
intensity += attenuation * dot * mat.diffuse;
//color += attenuation * l.color * dot * mat.color * mat.diffuse;
}
if (l.mode == Light.LIGHT_MODE.SPECULAIRE || l.mode == Light.LIGHT_MODE.PHONG)
{
Vector3 lightDir = l.point - hit.point;
lightDir.Normalize();
Vector3 V = ray.origin - hit.point;
V.Normalize();
float dot = Math.Max(0f, Vector3.Dot(hit.normal, lightDir));
if (dot > 0)
{
Vector3 R = hit.normal * 2 * Vector3.Dot(lightDir, hit.normal) - lightDir;
float spec = (float)Math.Pow(Vector3.Dot(V, R), mat.speculaire * l.intensite);
if (spec > 0)
{
specular = spec;
}
}
//color += l.color * intensite;
}
if (intensity > 1)
{
intensity = 1;
}
color = l.color * mat.color * l.intensite * intensity;
color += l.color * l.intensite * specular;
}
if (color.x > 1)
{
color.x = 1;
}
if (color.y > 1)
{
color.y = 1;
}
if (color.z > 1)
{
color.z = 1;
}
return(color);
}
public abstract bool Intersect(Ray ray, ref Hit hit, float tmin = 0f, float tmax = float.MaxValue);
