lux::MotionPrimitive Class Reference

#include <primitive.h>

Inheritance diagram for lux::MotionPrimitive:

Collaboration diagram for lux::MotionPrimitive:

Public Member Functions
	MotionPrimitive (boost::shared_ptr< Primitive > i, const Transform &i2ws, const Transform &i2we, float s, float e)
virtual	~MotionPrimitive ()
virtual BBox	WorldBound () const
virtual bool	CanIntersect () const
virtual bool	Intersect (const Ray &r, Intersection *in) const
virtual bool	IntersectP (const Ray &r) const
virtual void	GetShadingGeometry (const Transform &obj2world, const DifferentialGeometry &dg, DifferentialGeometry *dgShading) const
virtual bool	CanSample () const
virtual float	Area () const
virtual void	Sample (float u1, float u2, float u3, DifferentialGeometry *dg) const
virtual float	Pdf (const Point &p) const
virtual void	Sample (const Point &P, float u1, float u2, float u3, DifferentialGeometry *dg) const
virtual float	Pdf (const Point &p, const Vector &wi) const
virtual float	Pdf (const Point &p, const Point &po) const
Private Attributes
boost::shared_ptr< Primitive >	instance
MotionSystem *	motionSystem

Detailed Description

A decorator for instances of primitives with interpolated matrices for motion blur. This is achieved by changing the Object-to-World transformation in the result and other transforming all intersection info that was calculated, by interpolating between 2 matrices using the ray time.

Definition at line 326 of file primitive.h.

Constructor & Destructor Documentation

lux::MotionPrimitive::MotionPrimitive	(	boost::shared_ptr< Primitive >	i,
		const Transform &	i2ws,
		const Transform &	i2we,
		float	s,
		float	e
	)			`[inline]`

Creates a new instance from the given primitive.

Parameters:

	i	The primitive to instance.
	i2ws	The instance to world transformation at start time.
	i2we	The instance to world transformation at end time.
	s	The time at start.
	e	The time at end.

Definition at line 338 of file primitive.h.

References instance, and motionSystem.

virtual lux::MotionPrimitive::~MotionPrimitive ( ) [inline, virtual]

Definition at line 346 of file primitive.h.

References motionSystem.

Member Function Documentation

virtual float lux::MotionPrimitive::Area ( ) const [inline, virtual]

Returns the area of this primitive.

Reimplemented from lux::Primitive.

Definition at line 357 of file primitive.h.

References instance.

virtual bool lux::MotionPrimitive::CanIntersect ( ) const [inline, virtual]

Returns whether this primitive can be intersected.

Implements lux::Primitive.

Definition at line 350 of file primitive.h.

References instance.

virtual bool lux::MotionPrimitive::CanSample ( ) const [inline, virtual]

Returns whether this primitive can be sampled.

Implements lux::Primitive.

Definition at line 356 of file primitive.h.

References instance.

void MotionPrimitive::GetShadingGeometry	(	const Transform &	obj2world,
		const DifferentialGeometry &	dg,
		DifferentialGeometry *	dgShading
	)			const `[virtual]`

Calculates the shading geometry from the given intersection geometry.

Parameters:

	obj2world	The object to world transformation to use.
	dg	The intersection geometry.
	dgShading	The destination for the shading geometry.

Reimplemented from lux::Primitive.

Definition at line 214 of file primitive.cpp.

bool MotionPrimitive::Intersect	(	const Ray &	r,
		Intersection *	in
	)			const `[virtual]`

Intersects this primitive with the given ray. If an intersection is found, the ray will (i.e. r.tmax) and all fields in the intersection info will be updated.

Parameters:

	r	The ray to intersect with this primitive.
	in	The destination of the intersection information.

Returns:: Whether an intersection was found.

Reimplemented from lux::Primitive.

Definition at line 184 of file primitive.cpp.

References lux::Intersection::dg, lux::DifferentialGeometry::dndu, lux::DifferentialGeometry::dndv, lux::DifferentialGeometry::dpdu, lux::DifferentialGeometry::dpdv, lux::Transform::GetInverse(), lux::DifferentialGeometry::handle, instance, lux::Ray::maxt, motionSystem, lux::DifferentialGeometry::nn, lux::Normalize(), lux::DifferentialGeometry::p, lux::Intersection::primitive, lux::MotionSystem::Sample(), lux::DifferentialGeometry::time, lux::Ray::time, and lux::Intersection::WorldToObject.

bool MotionPrimitive::IntersectP ( const Ray & r ) const [virtual]

Tests for intersection of this primitive with the given ray.

Parameters:

r

The ray to intersect with this primitive.

Returns:: Whether an intersection was found.

Reimplemented from lux::Primitive.

Definition at line 208 of file primitive.cpp.

References lux::Transform::GetInverse(), instance, motionSystem, lux::MotionSystem::Sample(), and lux::Ray::time.

virtual float lux::MotionPrimitive::Pdf	(	const Point &	p,
		const Point &	po
	)			const `[inline, virtual]`

Returns the probability density for sampling the given point. (

See also:: Primitive::Sample(Point&,float,float,float,Normal*) const). No visibility test is done here.

Parameters:

	p	The point that was to be tested for visibility with the result.
	po	The point that was sampled.

Returns:: The pdf value (w.r.t. surface area) for the given point.

Reimplemented from lux::Primitive.

Definition at line 382 of file primitive.h.

References instance.

virtual float lux::MotionPrimitive::Pdf	(	const Point &	p,
		const Vector &	wi
	)			const `[inline, virtual]`

Returns the probability density for sampling the given point. (

See also:: Primitive::Sample(Point&,float,float,float,Normal*) const).

Parameters:

	p	The point that was to be tested for visibility with the result.
	wi	The direction from the above point to the sampled point.

Returns:: The pdf value (w.r.t. solid angle) for the given point.

Reimplemented from lux::Primitive.

Definition at line 379 of file primitive.h.

References instance.

virtual float lux::MotionPrimitive::Pdf ( const Point & p ) const [inline, virtual]

Returns the probablity density for sampling the given point (

See also:: Primitive::Sample(float,float,float,Normal*) const).

Parameters:

p

The point that was sampled.

Returns:: The pdf value (w.r.t. surface area) for the given point.

Reimplemented from lux::Primitive.

Definition at line 368 of file primitive.h.

References instance.

virtual void lux::MotionPrimitive::Sample	(	const Point &	p,
		float	u1,
		float	u2,
		float	u3,
		DifferentialGeometry *	dg
	)			const `[inline, virtual]`

Samples a point on this primitive that will be tested for visibility from a given point. Only the p, nn, dpdu, dpdv, u and v need to be calculated.

Parameters:

	p	The point that will be tested for visibility with the result.
	u1	The point coordinate in the first dimension.
	u2	The point coordinate in the second dimension.
	u3	The subprimitive to sample.
	dg	The destination to store the sampled point in.

Reimplemented from lux::Primitive.

Definition at line 369 of file primitive.h.

References lux::DifferentialGeometry::dndu, lux::DifferentialGeometry::dndv, lux::DifferentialGeometry::dpdu, lux::DifferentialGeometry::dpdv, lux::Transform::GetInverse(), instance, motionSystem, lux::DifferentialGeometry::nn, lux::Normalize(), lux::DifferentialGeometry::p, lux::MotionSystem::Sample(), and lux::DifferentialGeometry::time.

virtual void lux::MotionPrimitive::Sample	(	float	u1,
		float	u2,
		float	u3,
		DifferentialGeometry *	dg
	)			const `[inline, virtual]`

Samples a point on this primitive. Only the p, nn, dpdu, dpdv, u and v need to be calculated.

Parameters:

	u1	The point coordinate in the first dimension.
	u2	The point coordinate in the second dimension.
	u3	The subprimitive to sample.
	dg	The destination to store the sampled point in.