public int Compare(LightNode x, LightNode y)
{
if (x.Priority < y.Priority)
{
return(-1);
}
if (x.Priority > y.Priority)
{
return(+1);
}
return(x.SortTag.CompareTo(y.SortTag));
}
private void AddNode(LightNode lightNode)
{
Debug.Assert(lightNode.ActualIsEnabled, "Scene query contains disabled nodes.");
// Ignore light if the reference position is not in the clip geometry.
if (lightNode.Clip != null && _referencePosition.HasValue)
{
bool haveContact = HaveContact(lightNode.Clip, _referencePosition.Value);
if (lightNode.InvertClip == haveContact)
{
return;
}
}
// ----- Sort by estimated light contribution.
// All lights except IBL will be sorted by contribution.
// Note: If we have no reference node, it still makes sense to sort the objects
// by their contribution. We choose to get the light contribution at the position
// of each light.
Vector3 position = _referencePosition ?? lightNode.PoseWorld.Position;
//lightNode.SortTag = lightNode.GetLightContribution(position, 0.7f);
// Or simpler: Sort light nodes by distance. --> Use for image-based lights.
// (We use distance², because it is faster.)
//float distance = (position - lightNode.PoseWorld.Position).LengthSquared();
//lightNode.SortTag = -distance; // minus because we use descending sort.
if (lightNode.Light is AmbientLight)
{
AmbientLights.Add(lightNode);
lightNode.SortTag = lightNode.GetLightContribution(position, 0.7f);
}
else if (lightNode.Light is DirectionalLight)
{
DirectionalLights.Add(lightNode);
lightNode.SortTag = lightNode.GetLightContribution(position, 0.7f);
}
else if (lightNode.Light is PointLight)
{
PointLights.Add(lightNode);
lightNode.SortTag = lightNode.GetLightContribution(position, 0.7f);
}
else if (lightNode.Light is Spotlight)
{
Spotlights.Add(lightNode);
lightNode.SortTag = lightNode.GetLightContribution(position, 0.7f);
}
else if (lightNode.Light is ProjectorLight)
{
ProjectorLights.Add(lightNode);
lightNode.SortTag = lightNode.GetLightContribution(position, 0.7f);
}
else if (lightNode.Light is ImageBasedLight)
{
ImageBasedLights.Add(lightNode);
float distance = (position - lightNode.PoseWorld.Position).LengthSquared();
lightNode.SortTag = -distance; // minus because we use descending sort.
}
else
{
OtherLights.Add(lightNode);
lightNode.SortTag = lightNode.GetLightContribution(position, 0.7f);
}
}
