DDA< RayT, CoordT, Dim > Class Template Reference

A Digital Differential Analyzer. Unlike HDDA (defined above) this DDA uses a fixed step-size defined by the template parameter Dim! More...

#include <nanovdb/util/HDDA.h>

Public Types
using	RealType = typename RayT::RealType
using	RealT = RealType
using	Vec3Type = typename RayT::Vec3Type
using	Vec3T = Vec3Type
using	CoordType = CoordT

Public Member Functions
	DDA ()=default
	Default ctor. More...
__hostdev__	DDA (const RayT &ray)
	ctor from ray and dimension at which the DDA marches More...
__hostdev__ void	init (const RayT &ray, RealT startTime, RealT maxTime)
	Re-initializes the DDA. More...
__hostdev__ void	init (const RayT &ray)
	Simular to init above except it uses the bounds of the input ray. More...
__hostdev__ bool	step ()
	Increment the voxel index to next intersected voxel or node and returns true if the step in time does not exceed maxTime. More...
__hostdev__ const CoordT &	voxel () const
	Return the index coordinates of the next node or voxel intersected by the ray. If Log2Dim = 0 the return value is the actual signed coordinate of the voxel, else it is the origin of the corresponding VDB tree node or tile. More...
__hostdev__ RealType	time () const
	Return the time (parameterized along the Ray) of the first hit of a tree node of size 2^Log2Dim. More...
__hostdev__ RealType	maxTime () const
	Return the maximum time (parameterized along the Ray). More...
__hostdev__ RealType	next () const
	Return the time (parameterized along the Ray) of the second (i.e. next) hit of a tree node of size 2^Log2Dim. More...
__hostdev__ int	nextAxis () const

Detailed Description

template<typename RayT, typename CoordT = Coord, int Dim = 1>
class nanovdb::DDA< RayT, CoordT, Dim >

A Digital Differential Analyzer. Unlike HDDA (defined above) this DDA uses a fixed step-size defined by the template parameter Dim!

Note

The Ray template class is expected to have the following methods: test(time), t0(), t1(), invDir(), and operator()(time). See the example Ray class above for their definition.

Member Typedef Documentation

using CoordType = CoordT

using RealT = RealType

using RealType = typename RayT::RealType

using Vec3T = Vec3Type

using Vec3Type = typename RayT::Vec3Type

Constructor & Destructor Documentation

DDA ( )

default

Default ctor.

__hostdev__ DDA ( const RayT &  ray )

inline

ctor from ray and dimension at which the DDA marches

Member Function Documentation

__hostdev__ void init ( const RayT &  ray, RealT  startTime, RealT  maxTime  )

inline

Re-initializes the DDA.

__hostdev__ void init ( const RayT &  ray )

inline

Simular to init above except it uses the bounds of the input ray.

__hostdev__ RealType maxTime ( ) const

inline

Return the maximum time (parameterized along the Ray).

__hostdev__ RealType next ( ) const

inline

Return the time (parameterized along the Ray) of the second (i.e. next) hit of a tree node of size 2^Log2Dim.

Note

Incurs a (small) computational overhead.

__hostdev__ int nextAxis ( ) const

inline

__hostdev__ bool step ( )

inline

Increment the voxel index to next intersected voxel or node and returns true if the step in time does not exceed maxTime.

__hostdev__ RealType time ( ) const

inline

Return the time (parameterized along the Ray) of the first hit of a tree node of size 2^Log2Dim.

This value is initialized to startTime or ray.t0() depending on the constructor used.

Note

Incurs no computational overhead.

__hostdev__ const CoordT& voxel ( ) const

inline

Return the index coordinates of the next node or voxel intersected by the ray. If Log2Dim = 0 the return value is the actual signed coordinate of the voxel, else it is the origin of the corresponding VDB tree node or tile.

Note

Incurs no computational overhead.