public override void CalculateIntersection(IntersectionInfo info)
{
Ray4 localRay = info.LocalRay;
Vector4 point = localRay.Position + localRay.Direction * info.Distance;
Vector3 baryCoord = info.BaryCoord;
if (UseNormals())
{
Vector3 n = Na.Value * baryCoord.X + Nb.Value * baryCoord.Y + Nc.Value * baryCoord.Z;
info.Normal = TransformNormalToCameraCoords(n);
}
else
{
info.Normal = TransformNormalToCameraCoords(_normal);
}
if (UseTexture())
{
Vector2 coord = Ta.Value*baryCoord.X+Tb.Value*baryCoord.Y+Tc.Value*baryCoord.Z;
info.TexCoord = coord;
}
point = TransformPointToCameraCoords(point);
info.IntersectionPoint = point.ToV3();
}
public override void CalculateIntersection(IntersectionInfo info)
{
Ray4 localRay = info.LocalRay;
Vector4 point = localRay.Position + localRay.Direction * info.Distance;
Vector3 normal = point.ToV3() - Center;
info.Normal = TransformNormalToCameraCoords(normal);
point = TransformPointToCameraCoords(point);
info.IntersectionPoint = point.ToV3();
}
private Vector3 CalculateSurfaceColor(IntersectionInfo intersectionInfo, Ray ray)
{
Material material = intersectionInfo.Geomertry.Material;
Vector3 diffuseColor = material.DiffuseColor.GetColor(intersectionInfo.TexCoord);
Vector3 specularColor = material.SpecularColor;
Vector3 emissionColor = material.EmissionColor;
Vector3 ambientColor = material.AmbientColor;
float shininess = material.Shininess;
Vector3 lambert = Vector3.Zero;
Vector3 specular = Vector3.Zero;
Vector3 eyepos = ray.Position;
Vector3 point = intersectionInfo.IntersectionPoint;
Vector3 eyeDirection = eyepos - point;
eyeDirection.Normalize();
foreach (Light light in _scene.Lights)
{
Vector3 direction;
float attenuation;
float dist;
light.Calculate(point, out direction, out dist, out attenuation);
Vector3 half = (direction + eyeDirection);
half.Normalize();
if (CheckLight(intersectionInfo, direction, dist, light))
{
Vector3 lightColor = light.Color/attenuation;
float nDotL = Vector3.Dot(intersectionInfo.Normal, direction);
float nDotH = Vector3.Dot(intersectionInfo.Normal, half);
lambert += diffuseColor*lightColor*Math.Max(nDotL, 0.0f);
specular += specularColor*lightColor*(float) Math.Pow(Math.Max(nDotH, 0.0f), shininess);
}
}
Vector3 finalColor = ambientColor + emissionColor + lambert + specular;
return finalColor;
}
public override void CalculateIntersection(IntersectionInfo info)
{
Ray localRay = info.OriginalRay;
Vector3 point = localRay.Position + localRay.Direction*info.Distance;
Vector3 baryCoord = info.BaryCoord;
if (UseNormals())
{
Vector3 n = Na.Value*baryCoord.X + Nb.Value*baryCoord.Y + Nc.Value*baryCoord.Z;
info.Normal = n;
}
else
{
info.Normal = _normal;
}
if (UseTexture())
{
Vector2 coord = Ta.Value*baryCoord.X + Tb.Value*baryCoord.Y + Tc.Value*baryCoord.Z;
info.TexCoord = coord;
}
info.IntersectionPoint = point;
}
public abstract void CalculateIntersection(IntersectionInfo info);
private bool CheckLight(IntersectionInfo intersection, Vector3 direction, float distanceToLight, Light light)
{
Vector3 point = intersection.IntersectionPoint;
Ray ray = ShiftRay(point, direction);
foreach (Geomertry geomertry in _scene.GetObjects(ray))
{
IntersectionInfo intersectionInfo = geomertry.Intersect(ray);
if (intersectionInfo != null)
{
if (light is PointLight && intersectionInfo.Distance < distanceToLight)
return false;
if (light is DirectionalLight)
return false;
}
}
return true;
}
