射线追踪反射颗粒感

我在光线追踪刚刚实施的思考，这里是处理反射的代码，但是我有我的所有代码上传到github repository为更好的阅读：射线追踪反射颗粒感

Color finalColor = closestObjectMaterial.GetColor() * AMBIENTLIGHT; // Add ambient light to the calculation 

// Reflections 
if(closestObjectMaterial.GetSpecular() > 0 && closestObjectMaterial.GetSpecular() <= 1) 
{ 
    Vector scalar = closestObjectNormal * (closestObjectNormal.Dot(intersectingRayDir.Negative())); 
    Vector resultantReflection = intersectingRayDir.Negative() + ((scalar + (intersectingRayDir)) * 2); 
    Vector reflectionDirection = resultantReflection.Normalize(); 

    Ray reflectionRay(intersectionRayPos, resultantReflection); 

    // determine what the ray intersects with first 
    std::vector<FPType> reflectionIntersections; 
    for(auto sceneObject : sceneObjects) 
    { 
     reflectionIntersections.push_back(sceneObject->GetIntersection(reflectionRay)); 
    } 

    int closestObjectWithReflection = ClosestObjectIndex(reflectionIntersections); 

    if(closestObjectWithReflection != -1) 
    { 
     // reflection ray missed everthing else 
     if(reflectionIntersections[closestObjectWithReflection] > TOLERANCE) 
     { 
      // determine the position and direction at the point of intersection with the reflection ray 
      // the ray only affects the color if it reflected off something 
      Vector reflectionIntersectionPosition = intersectionRayPos + (resultantReflection * (reflectionIntersections[closestObjectWithReflection])); 
      Vector reflectionIntersectionRayDirection = resultantReflection; 
      Color reflectionIntersectionColor = GetColorAt(reflectionIntersectionPosition, reflectionIntersectionRayDirection, sceneObjects, closestObjectWithReflection, lightSources); 
      finalColor += (reflectionIntersectionColor * closestObjectMaterial.GetReflection()); 
     } 
    } 
}

我越来越所有这些反射颗粒感文物（这是一个16K的分辨率渲染放大）：

但是它更明显较低分辨率1920×1080像：

来源

2016-03-01 The Dude

我认为问题是，反射光线照射本身。我没有重新编译代码来确认这一点。您可以尝试在反射光线的起始位置添加一些偏移量。

Vector offset = resultantReflection * 0.001; 
Ray reflectionRay(intersectionRayPos + offset, resultantReflection);

来源

2016-03-02 08:58:24 codetiger

我结束了使用这个，结果反射需要被归一化。 'Vector offset = reflectionDirection * 0.001; Ray reflectionRay（intersectionRayPos + offset，resultingReflection）;' –

在你的评论中，你已经添加了 //添加了偏移来消除反射中的粒度效应实际的问题是，你的光线从反射对象A因为它是距离射线开始位置最近的物体，所以被认为会自己击中。所以为了避免这种情况，我们将光线从物体A的表面稍微开始。 – codetiger

射线追踪反射颗粒感

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