public override PointColore GetCouleurIntersect(V3 camera, V3 directionOculaire, float intersection)
{
V3 point = camera + (intersection * directionOculaire);
IMA.Invert_Coord_Spherique(point - this.position, this.rayon, out float u, out float v);
float offsetU = u / (float)(Math.PI * 2);
float offsetV = (v + (float)(Math.PI / 2)) / (float)(Math.PI);
V3 dMdu = new V3((float)(-Math.Sin(u) * Math.Cos(v) * rayon), (float)(rayon * (float)(Math.Cos(u) * Math.Cos(v))), 0);
V3 dMdv = new V3((float)(-Math.Sin(v) * Math.Cos(v) * rayon), (float)(rayon * (float)(-Math.Sin(u) * Math.Sin(v))), rayon * (float)Math.Cos(v));
float dhdu, dhdv;
BumpMap.Bump(offsetU, offsetV, out dhdu, out dhdv);
V3 normalPoint = new V3(point - position);
normalPoint.Normalize();
V3 T2 = dMdu ^ (dhdv * normalPoint);
V3 T3 = (dhdu * normalPoint) ^ dMdv;
V3 normaleBump = normalPoint + 0.008f * (T2 + T3);
normaleBump.Normalize();
return(new PointColore(point, normaleBump, texture.LireCouleur(offsetU, offsetV), this));
}
public V3 getPixelSphereNormal(V3 P)
{
V3 N = P - Center;
IMA.Invert_Coord_Spherique(N, R, out float u, out float v);
N.Normalize();
// calculate the new normal vector for the bump mapping effect
if (bump_activate)
{
N = bumpN(N, u, v);
}
return(N);
}
public override Couleur drawPixel(V3 positionInScene)
{
V3 posionForSphere = positionInScene - this.getPosition();
float v;
float u;
IMA.Invert_Coord_Spherique(posionForSphere, this.rayon, out u, out v);
V3 vectSphere = new V3((float)(this.rayon * Math.Cos(v) * Math.Cos(u)),
(float)(this.rayon * Math.Cos(v) * Math.Sin(u)),
(float)(this.rayon * Math.Sin(v)));
V3 copyvectSphere = new V3(vectSphere);
copyvectSphere.Normalize();
float dhsdu;
float dhsdv;
this.getBump(u / (Math.PI * 2), v / Math.PI + Math.PI / 2, out dhsdu, out dhsdv);
V3 dmsdu = new V3((float)(-1 * Math.Cos(v) * Math.Sin(u)),
(float)(1 * Math.Cos(v) * Math.Cos(u)),
0.0f);
V3 dmsdv = new V3((float)(-1 * Math.Sin(v) * Math.Cos(u)),
(float)(-1 * Math.Sin(v) * Math.Sin(u)),
(float)(1 * Math.Cos(v)));
V3 dmpsdu = dmsdu + dhsdu * copyvectSphere;
V3 dmpsdv = dmsdv + dhsdv * copyvectSphere;
V3 Np = ((dmpsdu ^ dmpsdv) / (dmpsdu ^ dmpsdv).Norm());
V3 vecteurBump = Np;
V3 vect = this.getPosition() + vectSphere;
Couleur vcolor = new Couleur();
foreach (Light light in RenderSing.getCurrentRender().getLight())
{
vcolor += light.applyLight(this, vect, vecteurBump, this.getColor(u / (2 * Math.PI), v / Math.PI + Math.PI / 2));
}
return(vcolor);
}
override public Couleur getCouleurRaycast(V3 PointIntersection, Scene scene)
{
//Console.WriteLine("Sphere Pt Intersect: " + PointIntersection.x + " " + PointIntersection.y + " " + PointIntersection.z);
V3 pixel_position = PointIntersection - center;
//Console.WriteLine(" " + PointIntersection.x + " " + PointIntersection.y + " " + PointIntersection.z);
IMA.Invert_Coord_Spherique(pixel_position, rayon, out float u, out float v);
//Console.WriteLine(" u: " + u+" ,v " + v);
//------------------------------BUMP MAPING---------------------------------------//
float pi = (float)Math.PI;
float uNormalise = u / (2 * pi);
float vNormalise = v / pi + pi;
Partial_derivative(u, v, out V3 dMdu, out V3 dMdv);
materiel.GetTextureBump().Bump(uNormalise, vNormalise, out float dhdu, out float dhdv);
V3 normal = getNormal(u, v) + materiel.GetForceBumping() * (dhdu * (getNormal(u, v) ^ dMdv) + dhdv * (getNormal(u, v) ^ dMdu));
//------------------------------TEXTURE---------------------------------------//
Couleur couleur = new Couleur();
if (materiel.GetTexture() != null)
{
couleur = materiel.GetTexture().LireCouleur(uNormalise, vNormalise);
}
else
{
couleur = materiel.GetCouleur();
}
//------------------------------LUMIERE---------------------------------------//
couleur = scene.CouleurEclairee(PointIntersection, normal, couleur, materiel, this);
return(couleur);
}
static public void Invert_Coord_Spherique(V3 P, float r, out float u, out float v)
{
P = P / r;
if (P.z >= 1)
{
u = (float)IMA.PI2; v = 0;
}
else if (P.z <= -1)
{
u = (float)-IMA.PI2; v = 0;
}
else
{
v = (float)Math.Asin(P.z);
float t = (float)(P.x / IMA.Cosf(v));
if (t <= -1)
{
u = (float)IMA.PI;
}
else if (t >= 1)
{
u = 0;
}
else
{
if (P.y < 0)
{
u = (float)(2 * IMA.PI - Math.Acos(t));
}
else
{
u = (float)Math.Acos(t);
}
}
}
}
public float Norm() // retourne la norme du vecteur
{
return((float)IMA.Sqrtf(x * x + y * y + z * z));
}