Ogre::Volume::GridSource Class Reference

A volume source from a discrete 3d grid. More...

#include <OgreVolumeGridSource.h>

Inheritance diagram for Ogre::Volume::GridSource:

Public Member Functions
	GridSource (bool trilinearValue, bool trilinearGradient, bool sobelGradient)
virtual	~GridSource (void)
	Destructor.
virtual void	combineWithSource (CSGOperationSource *operation, Source *source, const Vector3 &center, Real radius)
	Updates this grid with another source in a certain area.
size_t	getDepth (void) const
	Gets the depth of the texture.
bool	getFirstRayIntersection (const Ray &ray, Vector3 &result, Real scale=(Real) 1.0, size_t maxIterations=5000, Real maxDistance=(Real) 10000.0) const
	Gets the first intersection of a ray with the volume.
size_t	getHeight (void) const
	Gets the height of the texture.
virtual Real	getValue (const Vector3 &position) const
	Overridden from VolumeSource.
virtual Vector4	getValueAndGradient (const Vector3 &position) const
	Overridden from VolumeSource.
Real	getVolumeSpaceToWorldSpaceFactor (void) const
	Overridden from VolumeSource.
size_t	getWidth (void) const
	Gets the width of the texture.
void	serialize (const Vector3 &from, const Vector3 &to, float voxelWidth, const String &file)
	Serializes a volume source to a discrete grid file with deflated compression.
void	serialize (const Vector3 &from, const Vector3 &to, float voxelWidth, Real maxClampedAbsoluteDensity, const String &file)
	Same as the other serialize function but with a user definable maximum absolute density value.

Static Public Attributes
static const size_t	SERIALIZATION_CHUNK_SIZE
	The amount of items being written as one chunk during serialization.
static const uint32	VOLUME_CHUNK_ID
	The id of volume files.
static const uint16	VOLUME_CHUNK_VERSION
	The version of volume files.

Detailed Description

A volume source from a discrete 3d grid.

Constructor & Destructor Documentation

GridSource()

Ogre::Volume::GridSource::GridSource	(	bool	trilinearValue,
		bool	trilinearGradient,
		bool	sobelGradient
	)

~GridSource()

virtual Ogre::Volume::GridSource::~GridSource ( void  )

virtual

Destructor.

Member Function Documentation

combineWithSource()

virtual void Ogre::Volume::GridSource::combineWithSource ( CSGOperationSource *  operation, Source *  source, const Vector3 &  center, Real  radius  )

virtual

Updates this grid with another source in a certain area.

Use it for example to add spheres as a brush.

Parameters

operation	The operation to use, will use this source and the other given one as operands. Beware that this function overrides the maybe existing sources in the operation.
source	The other source to combine this one with.
center	The rough center of the affected area by the operation. If the other source is a sphere, take its center for example.
radius	The radius of the affected area. For the example sphere, you might use its radius times two because the density outside of the sphere is needed, too.

getDepth()

size_t Ogre::Volume::GridSource::getDepth

(

void

)

const

Gets the depth of the texture.

Returns

The depth of the texture.

getFirstRayIntersection()

bool Ogre::Volume::Source::getFirstRayIntersection ( const Ray &  ray, Vector3 &  result, Real  scale = (Real) 1.0, size_t  maxIterations = 5000, Real  maxDistance = (Real) 10000.0  ) const

inherited

Gets the first intersection of a ray with the volume.

If you are using this together with the VolumeChunk: Beware of the possible scaling or other transformations you did on the Chunk! Do the inverse first on the ray origin. Example of a scaling with the factor 10: ray.setOrigin(ray.getOrigin() / (Real)10.0);

Parameters

ray	The ray.
result	Will hold the intersection point if there is an intersection.
scale	The scaling of the volume compared to the world.
maxIterations	The maximum amount of iterations on the ray before giving up.
maxDistance	The maximum distance of the intersection point.

getHeight()

size_t Ogre::Volume::GridSource::getHeight

(

void

)

const

Gets the height of the texture.

Returns

The height of the texture.

getValue()

virtual Real Ogre::Volume::GridSource::getValue ( const Vector3 &  position ) const

virtual

Overridden from VolumeSource.

Implements Ogre::Volume::Source.

getValueAndGradient()

virtual Vector4 Ogre::Volume::GridSource::getValueAndGradient ( const Vector3 &  position ) const

virtual

Overridden from VolumeSource.

Implements Ogre::Volume::Source.

getVolumeSpaceToWorldSpaceFactor()

Real Ogre::Volume::GridSource::getVolumeSpaceToWorldSpaceFactor

(

void

)

const

Overridden from VolumeSource.

getWidth()

size_t Ogre::Volume::GridSource::getWidth

(

void

)

const

Gets the width of the texture.

Returns

The width of the texture.

serialize() [1/2]

void Ogre::Volume::Source::serialize ( const Vector3 &  from, const Vector3 &  to, float  voxelWidth, const String &  file  )

inherited

Serializes a volume source to a discrete grid file with deflated compression.

To achieve better compression, all density values are clamped within a maximum absolute value of (to - from).length() / 16.0. The values are scanned in this inner-loop-order: z, x, y. y last because there is usually the least isosurface intersection to be expected in the use case of terrain and so more often the maximum density value hit. The values are written as 16 Bit floats to save space. Note that this process is not lossless, the tradeoff is between accuracy of the source-reproduction (smaller voxelWidth) and smaller filesize (bigger voxelWidth).

Parameters

from	The start point to scan the volume.
to	The end point to scan the volume.
voxelWidth	The width of a single cube in the density grid.
file	The file to write the grid to.

serialize() [2/2]

void Ogre::Volume::Source::serialize ( const Vector3 &  from, const Vector3 &  to, float  voxelWidth, Real  maxClampedAbsoluteDensity, const String &  file  )

inherited

Same as the other serialize function but with a user definable maximum absolute density value.

Parameters

from	The start point to scan the volume.
to	The end point to scan the volume.
voxelWidth	The width of a single cube in the density grid.
maxClampedAbsoluteDensity	The maximum absolute density value to be written into the file, influencing the compression rate.
file	The file to write the grid to.

Member Data Documentation

SERIALIZATION_CHUNK_SIZE

const size_t Ogre::Volume::Source::SERIALIZATION_CHUNK_SIZE

staticinherited

The amount of items being written as one chunk during serialization.

VOLUME_CHUNK_ID

const uint32 Ogre::Volume::Source::VOLUME_CHUNK_ID

staticinherited

The id of volume files.

VOLUME_CHUNK_VERSION

const uint16 Ogre::Volume::Source::VOLUME_CHUNK_VERSION

staticinherited

The version of volume files.

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The documentation for this class was generated from the following file:

• OgreVolumeGridSource.h