public override bool Scatter(Scene scene, Ray ray, HitRecord hit, out Attenuation attenuation, out Ray scattered)
{
scattered = new Ray(hit.position, ray.direction);
var textureColor = GetTextureColor(hit.uv);
attenuation = Attenuation.Blend(albedo * textureColor, 1 - transparency, albedo * textureColor);
attenuation.forceToDoAnotherPass = true;
return(true);
}
public override bool Scatter(Scene scene, Ray ray, HitRecord hit, out Attenuation attenuation, out Ray scattered)
{
var direction = Vector3.Normalize(ray.direction);
Vector3 reflected = Vector3.Reflect(direction, hit.normal);
scattered = new Ray(hit.position, reflected + fuzz * Sphere.RandomInUnitSphere());
Vector3 diffuseColor = Vector3.Zero;
Vector3 SpecularColor = Vector3.Zero;
foreach (var light in scene.lights)
{
if (CastShadow(scene, light, hit))
{
continue;
}
Vector3 lightDir = -Vector3.Normalize(hit.position - light.position);
Vector3 reflectDir = Vector3.Reflect(-lightDir, hit.normal);
diffuseColor += light.color * light.insensity * Vector3.Dot(hit.normal, lightDir);
SpecularColor += light.color * light.insensity * specularIndex *
MathF.Pow(Math.Clamp(Vector3.Dot(reflectDir, -direction), 0, 1), glossIndex);
}
//环境光 + 光源
var textureColor = GetTextureColor(hit.uv);
var allColor = (scene.ambientColor + diffuseColor) * albedo * textureColor + SpecularColor;
attenuation = Attenuation.Blend(allColor, blendPercent, albedo * textureColor);
attenuation.attenuationType = attenuationType;
//兼容easyPipeline
if (fuzz == 0 && specularIndex == 1)
{
attenuation.forceToDoAnotherPass = true;
}
//attenuation = Attenuation.None(new Vector3(hit.uv.X, hit.uv.Y,0));
return(true);//(Vector3.Dot(scattered.direction, hit.normal) > 0);
}
