//--------------------------------------------------------------
#region Methods
//--------------------------------------------------------------
/// <inheritdoc/>
public void Reset()
{
ReferenceNode = null;
_referencePosition = null;
DirectionalLights.Clear();
AmbientLights.Clear();
PointLights.Clear();
Spotlights.Clear();
ProjectorLights.Clear();
ImageBasedLights.Clear();
OtherLights.Clear();
}
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.
Vector3F 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);
}
}
public void Set(SceneNode referenceNode, IList <SceneNode> nodes, RenderContext context)
{
Reset();
ReferenceNode = referenceNode;
// We use the origin of the reference node as the reference position for determining
// the light contribution. Alternatively we could use the closest point in/on model AABB,
// but this requires valid AABBs, is more expensive, etc.
if (referenceNode != null)
{
_referencePosition = referenceNode.PoseWorld.Position;
}
int numberOfNodes = nodes.Count;
#if DEBUG
for (int i = 0; i < numberOfNodes; i++)
{
Debug.Assert(nodes[i].ActualIsEnabled, "Scene query contains disabled nodes.");
}
#endif
if (context.LodCameraNode == null)
{
// ----- No LOD
for (int i = 0; i < numberOfNodes; i++)
{
var lightNode = nodes[i] as LightNode;
if (lightNode != null)
{
AddNode(lightNode);
}
}
}
else
{
// ----- LOD
// Get values for LOD computations.
var cameraNode = context.LodCameraNode;
_cameraPosition = cameraNode.PoseLocal.Position;
_lodBiasOverYScale = 1 / Math.Abs(cameraNode.Camera.Projection.ToMatrix44F().M11)
* cameraNode.LodBias * context.LodBias;
// Add nodes and evaluate LOD groups.
for (int i = 0; i < numberOfNodes; i++)
{
AddNodeWithLod(nodes[i], context);
}
}
// Sort lights.
if (referenceNode != null)
{
AmbientLights.Sort(DescendingLightNodeComparer.Instance);
DirectionalLights.Sort(DescendingLightNodeComparer.Instance);
PointLights.Sort(DescendingLightNodeComparer.Instance);
Spotlights.Sort(DescendingLightNodeComparer.Instance);
ProjectorLights.Sort(DescendingLightNodeComparer.Instance);
ImageBasedLights.Sort(DescendingLightNodeComparer.Instance);
OtherLights.Sort(DescendingLightNodeComparer.Instance);
}
}