A volume source from a 16 Bit float 3D grid capable of loading volume serializations. More...

#include <OgreVolumeHalfFloatGridSource.h>

Inheritance diagram for Ogre::Volume::HalfFloatGridSource:

Public Member Functions
	HalfFloatGridSource (const String &serializedVolumeFile, const bool trilinearValue=true, const bool trilinearGradient=false, const bool sobelGradient=false)
	Constructur. More...

	~HalfFloatGridSource (void)
	Destructor. More...

virtual void	combineWithSource (CSGOperationSource operation, Source source, const Vector3 &center, Real radius)
	Updates this grid with another source in a certain area. More...

size_t	getDepth (void) const
	Gets the depth of the texture. More...

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. More...

size_t	getHeight (void) const
	Gets the height of the texture. More...

Real	getMaxClampedAbsoluteDensity (void) const
	Gets the maximum absolute density value to be written into the data when combining, influencing the compression rate on serialization. More...

virtual Real	getValue (const Vector3 &position) const
	Overridden from VolumeSource. More...

virtual Vector4	getValueAndGradient (const Vector3 &position) const
	Overridden from VolumeSource. More...

Real	getVolumeSpaceToWorldSpaceFactor (void) const
	Overridden from VolumeSource. More...

size_t	getWidth (void) const
	Gets the width of the texture. More...

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. More...

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. More...

void	setMaxClampedAbsoluteDensity (Real maxClampedAbsoluteDensity)
	Sets the maximum absolute density value to be written into the data when combining, influencing the compression rate on serialization. More...

Static Public Attributes
static const size_t	SERIALIZATION_CHUNK_SIZE
	The amount of items being written as one chunk during serialization. More...

static const uint32	VOLUME_CHUNK_ID
	The id of volume files. More...

static const uint16	VOLUME_CHUNK_VERSION
	The version of volume files. More...

Detailed Description

A volume source from a 16 Bit float 3D grid capable of loading volume serializations.

Constructor & Destructor Documentation

◆ HalfFloatGridSource()

Ogre::Volume::HalfFloatGridSource::HalfFloatGridSource	(	const String &	serializedVolumeFile,
		const bool	trilinearValue = `true`,
		const bool	trilinearGradient = `false`,
		const bool	sobelGradient = `false`
	)

explicit

Constructur.

Parameters

serializedVolumeFile	Which volume serialization to get the data from.
trilinearValue	Whether to use trilinear filtering (true) or nearest neighbour (false) for the value.
trilinearGradient	Whether to use trilinear filtering (true) or nearest neighbour (false) for the gradient.
sobelGradient	Whether to add a bit of blur to the gradient like in a sobel filter.

◆ ~HalfFloatGridSource()

Ogre::Volume::HalfFloatGridSource::~HalfFloatGridSource ( void )

Destructor.

Member Function Documentation

◆ setMaxClampedAbsoluteDensity()

void Ogre::Volume::HalfFloatGridSource::setMaxClampedAbsoluteDensity ( Real maxClampedAbsoluteDensity )

Sets the maximum absolute density value to be written into the data when combining, influencing the compression rate on serialization.

Set it to 0.0 to deactivate.

Parameters

maxClampedAbsoluteDensity The maximum absolute density value.

◆ getMaxClampedAbsoluteDensity()

Real Ogre::Volume::HalfFloatGridSource::getMaxClampedAbsoluteDensity ( void ) const

Gets the maximum absolute density value to be written into the data when combining, influencing the compression rate on serialization.

Returns: The maximum absolute density value, 0.0 when deactivated.

◆ getValueAndGradient()

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

virtualinherited

Overridden from VolumeSource.

Implements Ogre::Volume::Source.

◆ getValue()

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

virtualinherited

Overridden from VolumeSource.

Implements Ogre::Volume::Source.

◆ getWidth()

size_t Ogre::Volume::GridSource::getWidth ( void ) const

inherited

Gets the width of the texture.

Returns: The width of the texture.

◆ getHeight()

size_t Ogre::Volume::GridSource::getHeight ( void ) const

inherited

Gets the height of the texture.

Returns: The height of the texture.

◆ getDepth()

size_t Ogre::Volume::GridSource::getDepth ( void ) const

inherited

Gets the depth of the texture.

Returns: The depth of the texture.

◆ combineWithSource()

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

virtualinherited

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.

◆ getVolumeSpaceToWorldSpaceFactor()

Real Ogre::Volume::GridSource::getVolumeSpaceToWorldSpaceFactor ( void ) const

inherited

Overridden from VolumeSource.

◆ 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.

◆ 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.

Member Data Documentation

◆ 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.

◆ SERIALIZATION_CHUNK_SIZE

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

staticinherited

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

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

OgreVolumeHalfFloatGridSource.h

Public Member Functions

Static Public Attributes

Detailed Description

Constructor & Destructor Documentation

◆ HalfFloatGridSource()

◆ ~HalfFloatGridSource()

Member Function Documentation

◆ setMaxClampedAbsoluteDensity()

◆ getMaxClampedAbsoluteDensity()

◆ getValueAndGradient()

◆ getValue()

◆ getWidth()

◆ getHeight()

◆ getDepth()

◆ combineWithSource()

◆ getVolumeSpaceToWorldSpaceFactor()

◆ serialize() [1/2]

◆ serialize() [2/2]

◆ getFirstRayIntersection()

Member Data Documentation

◆ VOLUME_CHUNK_ID

◆ VOLUME_CHUNK_VERSION

◆ SERIALIZATION_CHUNK_SIZE