internal ssBVHNode(ssBVH <GO> bvh)
{
gobjects = new List <GO>();
left = right = null;
parent = null;
this.nodeNumber = bvh.nodeCount++;
}
private ssBVHNode(ssBVH <GO> bvh, ssBVHNode <GO> lparent, List <GO> gobjectlist, Axis lastSplitAxis, int curdepth)
{
SSBVHNodeAdaptor <GO> nAda = bvh.nAda;
this.nodeNumber = bvh.nodeCount++;
this.parent = lparent; // save off the parent BVHGObj Node
this.depth = curdepth;
if (bvh.maxDepth < curdepth)
{
bvh.maxDepth = curdepth;
}
// Early out check due to bad data
// If the list is empty then we have no BVHGObj, or invalid parameters are passed in
if (gobjectlist == null || gobjectlist.Count < 1)
{
throw new Exception("ssBVHNode constructed with invalid paramaters");
}
// Check if we’re at our LEAF node, and if so, save the objects and stop recursing. Also store the min/max for the leaf node and update the parent appropriately
if (gobjectlist.Count <= bvh.LEAF_OBJ_MAX)
{
// once we reach the leaf node, we must set prev/next to null to signify the end
left = null;
right = null;
// at the leaf node we store the remaining objects, so initialize a list
gobjects = gobjectlist;
gobjects.ForEach(o => nAda.mapObjectToBVHLeaf(o, this));
computeVolume(nAda);
splitIfNecessary(nAda);
}
else
{
// --------------------------------------------------------------------------------------------
// if we have more than (bvh.LEAF_OBJECT_COUNT) objects, then compute the volume and split
gobjects = gobjectlist;
computeVolume(nAda);
splitNode(nAda);
childRefit(nAda, propagate: false);
}
}
public void setBVH(ssBVH <SSObject> BVH)
{
this._BVH = BVH;
}
public SSBVHRender(ssBVH <SSObject> bvh)
{
this.bvh = bvh;
}
internal ssBVHNode(ssBVH <GO> bvh, List <GO> gobjectlist) : this(bvh, null, gobjectlist, 0)
{
}
internal ssBVHNode(ssBVH <GO> bvh)
{
ContainedObjects = new List <GO>();
Left = Right = null;
Parent = null;
}
/// <summary>
/// tryRotate looks at all candidate rotations, and executes the rotation with the best resulting SAH (if any)
/// </summary>
/// <param name="bvh"></param>
internal void TryRotate(ssBVH <GO> bvh)
{
SSBVHNodeAdaptor <GO> nAda = bvh.nAda;
// if we are not a grandparent, then we can't rotate, so queue our parent and bail out
if (Left.IsLeaf && Right.IsLeaf)
{
if (Parent != null)
{
bvh.RefitNodes.Add(Parent);
return;
}
}
// for each rotation, check that there are grandchildren as necessary (aka not a leaf)
// then compute total SAH cost of our branches after the rotation.
double mySA = SA(Left) + SA(Right);
RotOpt bestRot = eachRot.Min(
rot => {
switch (rot)
{
case Rot.NONE: return(new RotOpt(mySA, Rot.NONE));
// child to grandchild rotations
case Rot.L_RL:
if (Right.IsLeaf)
{
return(new RotOpt(double.MaxValue, Rot.NONE));
}
else
{
return(new RotOpt(SA(Right.Left) + SA(BoundsOfPair(Left, Right.Right)), rot));
}
case Rot.L_RR:
if (Right.IsLeaf)
{
return(new RotOpt(double.MaxValue, Rot.NONE));
}
else
{
return(new RotOpt(SA(Right.Right) + SA(BoundsOfPair(Left, Right.Left)), rot));
}
case Rot.R_LL:
if (Left.IsLeaf)
{
return(new RotOpt(double.MaxValue, Rot.NONE));
}
else
{
return(new RotOpt(SA(BoundsOfPair(Right, Left.Right)) + SA(Left.Left), rot));
}
case Rot.R_LR:
if (Left.IsLeaf)
{
return(new RotOpt(double.MaxValue, Rot.NONE));
}
else
{
return(new RotOpt(SA(BoundsOfPair(Right, Left.Left)) + SA(Left.Right), rot));
}
// grandchild to grandchild rotations
case Rot.LL_RR:
if (Left.IsLeaf || Right.IsLeaf)
{
return(new RotOpt(double.MaxValue, Rot.NONE));
}
else
{
return(new RotOpt(SA(BoundsOfPair(Right.Right, Left.Right)) + SA(BoundsOfPair(Right.Left, Left.Left)), rot));
}
case Rot.LL_RL:
if (Left.IsLeaf || Right.IsLeaf)
{
return(new RotOpt(double.MaxValue, Rot.NONE));
}
else
{
return(new RotOpt(SA(BoundsOfPair(Right.Left, Left.Right)) + SA(BoundsOfPair(Left.Left, Right.Right)), rot));
}
// unknown...
default: throw new NotImplementedException("missing implementation for BVH Rotation SAH Computation .. " + rot.ToString());
}
});
// perform the best rotation...
if (bestRot.rot != Rot.NONE)
{
// if the best rotation is no-rotation... we check our parents anyhow..
if (Parent != null)
{
// but only do it some random percentage of the time.
if ((DateTime.Now.Ticks % 100) < 2)
{
bvh.RefitNodes.Add(Parent);
}
}
}
else
{
if (Parent != null)
{
bvh.RefitNodes.Add(Parent);
}
if (((mySA - bestRot.SAH) / mySA) < 0.3f)
{
return; // the benefit is not worth the cost
}
Console.WriteLine("BVH swap {0} from {1} to {2}", bestRot.rot.ToString(), mySA, bestRot.SAH);
// in order to swap we need to:
// 1. swap the node locations
// 2. update the depth (if child-to-grandchild)
// 3. update the parent pointers
// 4. refit the boundary box
ssBVHNode <GO> swap = null;
switch (bestRot.rot)
{
case Rot.NONE: break;
// child to grandchild rotations
case Rot.L_RL:
swap = Left;
Left = Right.Left;
Left.Parent = this;
Right.Left = swap;
swap.Parent = Right;
Right.ChildRefit(nAda, propagate: false);
break;
case Rot.L_RR:
swap = Left;
Left = Right.Right;
Left.Parent = this;
Right.Right = swap;
swap.Parent = Right;
Right.ChildRefit(nAda, propagate: false);
break;
case Rot.R_LL:
swap = Right;
Right = Left.Left;
Right.Parent = this;
Left.Left = swap;
swap.Parent = Left;
Left.ChildRefit(nAda, propagate: false);
break;
case Rot.R_LR:
swap = Right;
Right = Left.Right;
Right.Parent = this;
Left.Right = swap;
swap.Parent = Left;
Left.ChildRefit(nAda, propagate: false);
break;
// grandchild to grandchild rotations
case Rot.LL_RR:
swap = Left.Left;
Left.Left = Right.Right;
Right.Right = swap;
Left.Left.Parent = Left;
swap.Parent = Right;
Left.ChildRefit(nAda, propagate: false);
Right.ChildRefit(nAda, propagate: false);
break;
case Rot.LL_RL:
swap = Left.Left;
Left.Left = Right.Left;
Right.Left = swap;
Left.Left.Parent = Left;
swap.Parent = Right;
Left.ChildRefit(nAda, propagate: false);
Right.ChildRefit(nAda, propagate: false);
break;
// unknown...
default: throw new NotImplementedException("missing implementation for BVH Rotation .. " + bestRot.rot);
}
// fix the depths if necessary....
switch (bestRot.rot)
{
case Rot.L_RL:
case Rot.L_RR:
case Rot.R_LL:
case Rot.R_LR:
SetDepth(nAda, Depth);
break;
}
}
}
/// <summary>
/// tryRotate looks at all candidate rotations, and executes the rotation with the best resulting SAH (if any)
/// </summary>
/// <param name="bvh"></param>
internal void tryRotate(ssBVH <GO> bvh)
{
SSBVHNodeAdaptor <GO> nAda = bvh.nAda;
// if we are not a grandparent, then we can't rotate, so queue our parent and bail out
if (left.IsLeaf && right.IsLeaf)
{
if (parent != null)
{
bvh.refitNodes.Add(parent);
return;
}
}
// for each rotation, check that there are grandchildren as necessary (aka not a leaf)
// then compute total SAH cost of our branches after the rotation.
float mySAH = SAH(left) + SAH(right);
rotOpt bestRot = eachRot.Min((rot) => {
switch (rot)
{
case Rot.NONE: return(new rotOpt(mySAH, Rot.NONE));
// child to grandchild rotations
case Rot.L_RL:
if (right.IsLeaf)
{
return(new rotOpt(float.MaxValue, Rot.NONE));
}
else
{
return(new rotOpt(SAH(right.left) + SAH(AABBofPair(left, right.right)), rot));
}
case Rot.L_RR:
if (right.IsLeaf)
{
return(new rotOpt(float.MaxValue, Rot.NONE));
}
else
{
return(new rotOpt(SAH(right.right) + SAH(AABBofPair(left, right.left)), rot));
}
case Rot.R_LL:
if (left.IsLeaf)
{
return(new rotOpt(float.MaxValue, Rot.NONE));
}
else
{
return(new rotOpt(SAH(AABBofPair(right, left.right)) + SAH(left.left), rot));
}
case Rot.R_LR:
if (left.IsLeaf)
{
return(new rotOpt(float.MaxValue, Rot.NONE));
}
else
{
return(new rotOpt(SAH(AABBofPair(right, left.left)) + SAH(left.right), rot));
}
// grandchild to grandchild rotations
case Rot.LL_RR:
if (left.IsLeaf || right.IsLeaf)
{
return(new rotOpt(float.MaxValue, Rot.NONE));
}
else
{
return(new rotOpt(SAH(AABBofPair(right.right, left.right)) + SAH(AABBofPair(right.left, left.left)), rot));
}
case Rot.LL_RL:
if (left.IsLeaf || right.IsLeaf)
{
return(new rotOpt(float.MaxValue, Rot.NONE));
}
else
{
return(new rotOpt(SAH(AABBofPair(right.left, left.right)) + SAH(AABBofPair(left.left, right.right)), rot));
}
// unknown...
default: throw new NotImplementedException("missing implementation for BVH Rotation SAH Computation .. " + rot.ToString());
}
});
// perform the best rotation...
if (bestRot.rot != Rot.NONE)
{
// if the best rotation is no-rotation... we check our parents anyhow..
if (parent != null)
{
// but only do it some random percentage of the time.
if ((DateTime.Now.Ticks % 100) < 2)
{
bvh.refitNodes.Add(parent);
}
}
}
else
{
if (parent != null)
{
bvh.refitNodes.Add(parent);
}
if (((mySAH - bestRot.SAH) / mySAH) < 0.3f)
{
return; // the benefit is not worth the cost
}
Console.WriteLine("BVH swap {0} from {1} to {2}", bestRot.rot.ToString(), mySAH, bestRot.SAH);
// in order to swap we need to:
// 1. swap the node locations
// 2. update the depth (if child-to-grandchild)
// 3. update the parent pointers
// 4. refit the boundary box
ssBVHNode <GO> swap = null;
switch (bestRot.rot)
{
case Rot.NONE: break;
// child to grandchild rotations
case Rot.L_RL: swap = left; swap.depth++; left = right.left; left.parent = this; left.depth--; right.left = swap; swap.parent = right; right.childRefit(nAda); break;
case Rot.L_RR: swap = left; swap.depth++; left = right.right; left.parent = this; left.depth--; right.right = swap; swap.parent = right; right.childRefit(nAda); break;
case Rot.R_LL: swap = right; swap.depth++; right = left.left; right.parent = this; right.depth--; left.left = swap; swap.parent = left; left.childRefit(nAda); break;
case Rot.R_LR: swap = right; swap.depth++; right = left.right; right.parent = this; right.depth--; left.right = swap; swap.parent = left; left.childRefit(nAda); break;
// grandchild to grandchild rotations
case Rot.LL_RR: swap = left.left; left.left = right.right; right.right = swap; left.left.parent = left; swap.parent = right; left.childRefit(nAda, recurse: false); right.childRefit(nAda); break;
case Rot.LL_RL: swap = left.left; left.left = right.left; right.left = swap; left.left.parent = left; swap.parent = right; left.childRefit(nAda, recurse: false); right.childRefit(nAda); break;
// unknown...
default: throw new NotImplementedException("missing implementation for BVH Rotation .. " + bestRot.rot.ToString());
}
}
}
public void setBVH(ssBVH <IHitable> BVH)
{
this._BVH = BVH;
}
public void setBVH(ssBVH <SSSphere> bvh)
{
_bvh = bvh;
}
public void setBVH(ssBVH <SSSphere> BVH)
{
_BVH = BVH;
}
public SSBVHRender(ssBVH <SSObject> bvh)
{
this.bvh = bvh;
this.MainColor = Color4.Red;
this.renderState.lighted = false;
}
public SSBVHRender(ssBVH <SSObject> bvh)
{
this.bvh = bvh;
this.MainColor = Color4.Red;
}
