public static bool Intersect(H1Ray InRay, H1Bound InBound, out float OutT0, out float OutT1)
{
float T0 = 0.0f;
float T1 = float.MaxValue;
H1Vector3 RayOrigin = InRay.Origin;
for (Int32 SlabIndex = 0; SlabIndex < InBound.SafeSlabs.Count(); ++SlabIndex)
{
// curr slab
H1Slab Slab = InBound.SafeSlabs[SlabIndex];
// slab normal
H1Vector3 SlabNormal = Slab.Normal;
float NominatorPlane0 = Slab[0].Distance - H1Vector3.Dot(Slab[0].Normal, InRay.Origin);
float NominatorPlane1 = Slab[1].Distance - H1Vector3.Dot(Slab[1].Normal, InRay.Origin);
float Denominator = H1Vector3.Dot(InRay.Direction, SlabNormal);
float CurrT0 = NominatorPlane0 / Denominator;
float CurrT1 = NominatorPlane1 / Denominator;
// check if we need to swap
if (CurrT0 > CurrT1)
{
float Temp = CurrT0;
CurrT0 = CurrT1;
CurrT1 = Temp;
}
// if we need to update T0 or T1, update it
if (T0 < CurrT0)
{
T0 = CurrT0;
}
if (T1 > CurrT1)
{
T1 = CurrT1;
}
if (T0 > T1)
{
OutT0 = float.MaxValue;
OutT1 = float.MinValue;
return(false);
}
}
OutT0 = T0;
OutT1 = T1;
return(true);
}
protected void CreateSlabs(EBoundType InBoundType, H1Vector3 InLocation, H1Vector3 InExtent)
{
// depending on bound type, define the number of slabs
Int32 SlabNum = 0;
// setting transform properties
Position = InLocation;
Extent = InExtent;
switch (InBoundType)
{
case EBoundType.Box:
{
// total 3 slabs needed (x, y, z)
SlabNum = 3;
Slabs = new H1Slab[SlabNum];
// x-axis
H1Vector3 DirectionX = new H1Vector3(1, 0, 0);
float ExtentX = InExtent.X;
Slabs[0] = new H1Slab(DirectionX, Position, ExtentX);
// y-axis
H1Vector3 DirectionY = new H1Vector3(0, 1, 0);
float ExtentY = InExtent.Y;
Slabs[1] = new H1Slab(DirectionY, Position, ExtentY);
// z-axis
H1Vector3 DirectionZ = new H1Vector3(0, 0, 1);
float ExtentZ = InExtent.Z;
Slabs[2] = new H1Slab(DirectionZ, Position, ExtentZ);
break;
}
default:
break;
}
}
