OGRE  2.0
Object-Oriented Graphics Rendering Engine
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Properties Friends Macros Groups Pages
Ogre::Volume::GridSource Class Referenceabstract

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

#include <OgreVolumeGridSource.h>

+ Inheritance diagram for Ogre::Volume::GridSource:
+ Collaboration diagram for Ogre::Volume::GridSource:

Public Member Functions

 GridSource (bool trilinearValue, bool trilinearGradient, bool sobelGradient)
 
virtual ~GridSource (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...
 
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...
 

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...
 

Protected Member Functions

const Vector3 getGradient (size_t x, size_t y, size_t z) const
 Gets a gradient of a point with optional sobel blurring. More...
 
virtual Vector3 getIntersectionEnd (const Ray &ray, Real maxDistance) const
 Overridden from VolumeSource. More...
 
virtual Vector3 getIntersectionStart (const Ray &ray, Real maxDistance) const
 Overridden from VolumeSource. More...
 
virtual float getVolumeGridValue (size_t x, size_t y, size_t z) const =0
 Gets the volume value of a position. More...
 
virtual void setVolumeGridValue (int x, int y, int z, float value)=0
 Sets the volume value of a position. More...
 

Protected Attributes

size_t mDepth
 The texture depth. More...
 
size_t mHeight
 The texture height. More...
 
Real mPosXScale
 The scale of the position based on the world width. More...
 
Real mPosYScale
 The scale of the position based on the world height. More...
 
Real mPosZScale
 The scale of the position based on the world depth. More...
 
const bool mSobelGradient
 Whether to blur the gradient a bit Sobel like. More...
 
const bool mTrilinearGradient
 Whether to use trilinear filtering or not for the gradient. More...
 
bool mTrilinearValue
 Whether to use trilinear filtering or not for the value. More...
 
Real mVolumeSpaceToWorldSpaceFactor
 Factor to come from volume coordinate to world coordinate. More...
 
size_t mWidth
 The texture width. More...
 

Detailed Description

A volume source from a discrete 3d grid.

Definition at line 43 of file OgreVolumeGridSource.h.

Constructor & Destructor Documentation

Ogre::Volume::GridSource::GridSource ( bool  trilinearValue,
bool  trilinearGradient,
bool  sobelGradient 
)
virtual Ogre::Volume::GridSource::~GridSource ( void  )
virtual

Destructor.

Member Function Documentation

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
operationThe 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.
sourceThe other source to combine this one with.
centerThe rough center of the affected area by the operation. If the other source is a sphere, take its center for example.
radiusThe 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.
size_t Ogre::Volume::GridSource::getDepth ( void  ) const

Gets the depth of the texture.

Returns
The depth of the texture.
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
rayThe ray.
resultWill hold the intersection point if there is an intersection.
scaleThe scaling of the volume compared to the world.
maxIterationsThe maximum amount of iterations on the ray before giving up.
maxDistanceThe maximum distance of the intersection point.
const Vector3 Ogre::Volume::GridSource::getGradient ( size_t  x,
size_t  y,
size_t  z 
) const
inlineprotected

Gets a gradient of a point with optional sobel blurring.

Parameters
xThe x coordinate of the point.
yThe x coordinate of the point.
zThe x coordinate of the point.

Definition at line 117 of file OgreVolumeGridSource.h.

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

Gets the height of the texture.

Returns
The height of the texture.
virtual Vector3 Ogre::Volume::GridSource::getIntersectionEnd ( const Ray ray,
Real  maxDistance 
) const
protectedvirtual

Overridden from VolumeSource.

Reimplemented from Ogre::Volume::Source.

virtual Vector3 Ogre::Volume::GridSource::getIntersectionStart ( const Ray ray,
Real  maxDistance 
) const
protectedvirtual

Overridden from VolumeSource.

Reimplemented from Ogre::Volume::Source.

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

Overridden from VolumeSource.

Implements Ogre::Volume::Source.

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

Overridden from VolumeSource.

Implements Ogre::Volume::Source.

virtual float Ogre::Volume::GridSource::getVolumeGridValue ( size_t  x,
size_t  y,
size_t  z 
) const
protectedpure virtual

Gets the volume value of a position.

Parameters
xThe x position.
yThe y position.
zThe z position.
Returns
The density.

Implemented in Ogre::Volume::HalfFloatGridSource, and Ogre::Volume::TextureSource.

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

Overridden from VolumeSource.

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

Gets the width of the texture.

Returns
The width of the texture.
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
fromThe start point to scan the volume.
toThe end point to scan the volume.
voxelWidthThe width of a single cube in the density grid.
fileThe file to write the grid to.
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
fromThe start point to scan the volume.
toThe end point to scan the volume.
voxelWidthThe width of a single cube in the density grid.
maxClampedAbsoluteDensityThe maximum absolute density value to be written into the file, influencing the compression rate.
fileThe file to write the grid to.
virtual void Ogre::Volume::GridSource::setVolumeGridValue ( int  x,
int  y,
int  z,
float  value 
)
protectedpure virtual

Sets the volume value of a position.

Parameters
xThe x position.
yThe y position.
zThe z position.
valueThe density to be set.

Implemented in Ogre::Volume::HalfFloatGridSource, and Ogre::Volume::TextureSource.

Member Data Documentation

size_t Ogre::Volume::GridSource::mDepth
protected

The texture depth.

Definition at line 54 of file OgreVolumeGridSource.h.

size_t Ogre::Volume::GridSource::mHeight
protected

The texture height.

Definition at line 51 of file OgreVolumeGridSource.h.

Real Ogre::Volume::GridSource::mPosXScale
protected

The scale of the position based on the world width.

Definition at line 57 of file OgreVolumeGridSource.h.

Real Ogre::Volume::GridSource::mPosYScale
protected

The scale of the position based on the world height.

Definition at line 60 of file OgreVolumeGridSource.h.

Real Ogre::Volume::GridSource::mPosZScale
protected

The scale of the position based on the world depth.

Definition at line 63 of file OgreVolumeGridSource.h.

const bool Ogre::Volume::GridSource::mSobelGradient
protected

Whether to blur the gradient a bit Sobel like.

Definition at line 72 of file OgreVolumeGridSource.h.

const bool Ogre::Volume::GridSource::mTrilinearGradient
protected

Whether to use trilinear filtering or not for the gradient.

Definition at line 69 of file OgreVolumeGridSource.h.

bool Ogre::Volume::GridSource::mTrilinearValue
protected

Whether to use trilinear filtering or not for the value.

Definition at line 66 of file OgreVolumeGridSource.h.

Real Ogre::Volume::GridSource::mVolumeSpaceToWorldSpaceFactor
protected

Factor to come from volume coordinate to world coordinate.

Definition at line 75 of file OgreVolumeGridSource.h.

size_t Ogre::Volume::GridSource::mWidth
protected

The texture width.

Definition at line 48 of file OgreVolumeGridSource.h.

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

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

Definition at line 74 of file OgreVolumeSource.h.

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

The id of volume files.

Definition at line 68 of file OgreVolumeSource.h.

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

The version of volume files.

Definition at line 71 of file OgreVolumeSource.h.


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