private static MyColorClass Raytrace(ref Scene scene, ref List <Object> objects, ref Ray ray, ref int reflectRecursion, Object _intersectObj = null)
{
double distance = 9999999.9;
Object currentObj = null;
IntersectionObject currentInter = null;
MyColorClass finalColor = new MyColorClass();
for (int i = 0; i < objects.Count; i++)
{
if (_intersectObj == null || (_intersectObj != null && _intersectObj != objects[i]))
{
IntersectionObject interSectObj = null;
try
{
interSectObj = objects[i].intersect(ray);
}
catch (Exception e)
{
Console.WriteLine(e);
throw;
}
if (interSectObj.hasIntersection)
{
var tmpDistance = (interSectObj.intersectionPoint - ray.origin).getMagnitude();
if (tmpDistance <= distance)
{
distance = tmpDistance;
currentInter = interSectObj;
currentObj = objects[i];
}
}
}
}
return(getLighting(ref currentInter, ref currentObj, ref objects, ref scene, finalColor, ref reflectRecursion));
}
private static MyColorClass getLighting(ref IntersectionObject currentInter, ref Object currentObj, ref List <Object> objects, ref Scene scene, MyColorClass finalColor, ref int reflectRecursion)
{
bool lightBlocked = false;
if (currentObj != null)
{
foreach (var l in scene.Lights)
{
lightBlocked = false;
var lightVector = currentInter.intersectionPoint - l.position;
var lightToObjDistance = lightVector.getMagnitude();
lightVector.normalize();
var lightRay = new Ray(l.position, lightVector);
for (int j = 0; j < objects.Count; j++)
{
currentObj = objects[j];
if (currentObj != currentInter.obj)
{
IntersectionObject lightInterSectObj = null;
try
{
lightInterSectObj = currentObj.intersect(lightRay);
}
catch (Exception e)
{
Console.WriteLine(e);
throw;
}
if (lightInterSectObj.hasIntersection)
{
var lightToInterDistance = (lightInterSectObj.intersectionPoint - l.position).getMagnitude();
if (lightToInterDistance < lightToObjDistance)
{
lightBlocked = true;
}
}
}
}
finalColor += l.getLighAt(currentInter, lightToObjDistance, lightBlocked);
if (currentInter.obj.material.reflection > 0 && reflectRecursion > 0)
{
return(computeReflection(ref reflectRecursion, ref currentInter, ref scene, ref objects, l,
ref lightToObjDistance));
}
if (currentInter.obj.material.diffuseColor.a < 1 && reflectRecursion > 0)
{
return(computeTransparency(ref reflectRecursion, ref currentInter, ref scene, ref objects, l,
ref lightToObjDistance));
}
}
}
finalColor.normalizeColor();
return(finalColor);
}
