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 override PointColore GetCouleurIntersect(V3 camera, V3 directionOculaire, float intersection)
{
V3 point = new V3(camera + intersection * directionOculaire);
V3 AI = new V3(point - position);
float beta = (AI * AC) / (AC.Norm() * AC.Norm());
float alpha = (AI * AB) / (AB.Norm() * AB.Norm());
V3 dMdu = AB;
V3 dMdv = AC;
float dhdu, dhdv;
BumpMap.Bump(alpha, beta, out dhdu, out dhdv);
V3 T2 = dMdu ^ (dhdv * normal);
V3 T3 = (dhdu * normal) ^ dMdv;
V3 normaleBump = normal + 0.08f * (T2 + T3);
normaleBump.Normalize();
V3 positionCouleur = textureA + (alpha * (textureB - textureA) + beta * (textureC - textureA));
return(new PointColore(point, normaleBump, texture.LireCouleur(positionCouleur.x, positionCouleur.y), this));
}
public void ComputeScatteringFunctions(SurfaceInteraction si,
IObjectArena arena,
TransportMode mode,
bool allowMultipleLobes)
{
BumpMap?.Bump(si);
var bsdf = si.BSDF.Initialize(in si);
var kd = Kd.Evaluate(in si).Clamp();
if (!kd.IsBlack())
{
bsdf.Add(arena.Create <LambertianReflection>().Initialize(in kd));
}
var ks = Ks.Evaluate(in si).Clamp();
if (ks.IsBlack())
{
return;
}
var fresnel = arena.Create <FresnelDielectric>().Initialize(1.5f, 1f);
var rough = Roughness.Evaluate(in si);
if (RemapRoughness)
{
rough = TrowbridgeReitzDistribution.RoughnessToAlpha(rough);
}
var distribution = arena.Create <TrowbridgeReitzDistribution>().Initialize(rough, rough);
bsdf.Add(arena.Create <MicrofacetReflection>().Initialize(ks, distribution, fresnel));
}
public override PointColore GetCouleurIntersect(V3 camera, V3 directionOculaire, float intersection)
{
V3 point = new V3(camera + intersection * directionOculaire);
V3 AI = new V3(point - position);
V3 AB = new V3(pointB - position);
V3 ABNormalise = new V3(AB);
ABNormalise.Normalize();
V3 AC = new V3(pointC - position);
V3 ACNormalise = new V3(AC);
ACNormalise.Normalize();
V3 normal = new V3(AB ^ AC);
normal.Normalize();
float alpha = (AI * AB) / (AB * AB);
float beta = (AI * AC) / (AC * AC);
V3 dMdu = AB;
V3 dMdv = AC;
float dhdu, dhdv;
BumpMap.Bump(alpha, beta, out dhdu, out dhdv);
V3 T2 = dMdu ^ (dhdv * normal);
V3 T3 = (dhdu * normal) ^ dMdv;
V3 normaleBump = normal + 0.008f * (T2 + T3);
normaleBump.Normalize();
return(new PointColore(point, normaleBump, texture.LireCouleur(alpha, beta), this));
}