Ogre::AtmosphereNpr Class Reference

Non-physically-based-render (NPR) Atmosphere solution. More...

#include <OgreAtmosphereNpr.h>

Inheritance diagram for Ogre::AtmosphereNpr:

Classes
struct	Preset

Public Types
enum	AxisConvention {   Xup , Yup , Zup , NegationFlag = ( 1u << 2u ) ,   NegXup = Xup | NegationFlag , NegYup = Yup | NegationFlag , NegZup = Zup | NegationFlag }
typedef FastArray< Preset >	PresetArray

Public Member Functions
	AtmosphereNpr (VaoManager *vaoManager)
	~AtmosphereNpr () override
void	_update (SceneManager *sceneManager, Camera *camera) override
	Called when the scene manager wants to render and needs the component to update its buffers. More...
uint32	bindConstBuffers (CommandBuffer *commandBuffer, size_t slotIdx) override
	Tells the component to bind the buffers Returns getNumConstBuffersSlots. More...
void	destroySky (Ogre::SceneManager *sceneManager)
Vector3	getAtmosphereAt (const Vector3 cameraDir, bool bSkipSun=false)
uint32	getNumConstBuffersSlots () const override
	How many additional const buffers are required in our Hlms integration. More...
const Preset &	getPreset () const
const PresetArray &	getPresets () const
uint32	preparePassHash (Hlms *hlms, size_t constBufferSlot) override
	Returns getNumConstBuffersSlots. More...
void	setLight (Light *ogre_nullable light)
	Links an existing directional to be updated using the Atmosphere's parameters. More...
void	setPreset (const Preset &preset)
	Sets a specific preset as current. More...
void	setPresets (const PresetArray &presets)
	Sets multiple presets at different times for interpolation We will sort the array. More...
void	setSky (Ogre::SceneManager *sceneManager, bool bEnabled)
void	setSunDir (const Ogre::Vector3 &sunDir, const float normalizedTimeOfDay)
	More direct approach on setting time of day. More...
void	setSunDir (const Radian sunAltitude, const Ogre::Radian azimuth=Radian(0.0f))
	Sets the time of day. More...
void	updatePreset (const Ogre::Vector3 &sunDir, const float fTime)
	After having called AtmosphereNpr::setPresets, this function will interpolate between mPresets[fTime] and mPresets[fTime+1]. More...
Public Member Functions inherited from Ogre::AtmosphereComponent
virtual	~AtmosphereComponent ()
virtual bool	providesHlmsCode () const
	Indicates Hlms implementations this component has Hlms integration. More...

Public Attributes
float	mAtmosphereHeight
	How big is the "atmosphere". More...
float	mAtmosphereSeaLevel
	When camera's height == mAtmosphereSeaLevel, the camera is considered to be at the ground i.e. More...
AxisConvention	mConvention
	PUBLIC VARIABLE. More...

Detailed Description

Non-physically-based-render (NPR) Atmosphere solution.

This solution is also integrated into HlmsPbs.

It may seem counter-intuitive to include an NPR solution in a PBR solution (HlmsPbs) However it makes sense because it looks nice and is efficient for most cases.

A PBR solution is iterative and requires more resources.

Member Typedef Documentation

PresetArray

typedef FastArray<Preset> Ogre::AtmosphereNpr::PresetArray

Member Enumeration Documentation

AxisConvention

enum Ogre::AtmosphereNpr::AxisConvention

Enumerator
Xup
Yup
Zup
NegationFlag
NegXup
NegYup
NegZup

Constructor & Destructor Documentation

AtmosphereNpr()

Ogre::AtmosphereNpr::AtmosphereNpr

(

VaoManager *

vaoManager

)

~AtmosphereNpr()

Ogre::AtmosphereNpr::~AtmosphereNpr ( )

override

Member Function Documentation

_update()

void Ogre::AtmosphereNpr::_update ( SceneManager *  sceneManager, Camera *  camera  )

overridevirtual

Called when the scene manager wants to render and needs the component to update its buffers.

Implements Ogre::AtmosphereComponent.

bindConstBuffers()

uint32 Ogre::AtmosphereNpr::bindConstBuffers ( CommandBuffer *  commandBuffer, size_t  slotIdx  )

overridevirtual

Tells the component to bind the buffers Returns getNumConstBuffersSlots.

Implements Ogre::AtmosphereComponent.

destroySky()

void Ogre::AtmosphereNpr::destroySky

(

Ogre::SceneManager *

sceneManager

)

getAtmosphereAt()

Vector3 Ogre::AtmosphereNpr::getAtmosphereAt	(	const Vector3	cameraDir,
		bool	bSkipSun = false
	)

Remarks

We assume camera displacement is 0.

Parameters

cameraDir	Point to look at
bSkipSun	When true, the sun disk is skipped

Returns

The value at that camera direction, given the current parameters

getNumConstBuffersSlots()

uint32 Ogre::AtmosphereNpr::getNumConstBuffersSlots ( ) const

overridevirtual

How many additional const buffers are required in our Hlms integration.

Implements Ogre::AtmosphereComponent.

getPreset()

const Preset& Ogre::AtmosphereNpr::getPreset ( ) const

inline

getPresets()

const PresetArray& Ogre::AtmosphereNpr::getPresets ( ) const

inline

preparePassHash()

uint32 Ogre::AtmosphereNpr::preparePassHash ( Hlms *  hlms, size_t  constBufferSlot  )

overridevirtual

Returns getNumConstBuffersSlots.

Implements Ogre::AtmosphereComponent.

setLight()

void Ogre::AtmosphereNpr::setLight

(

Light *ogre_nullable

light

)

Links an existing directional to be updated using the Atmosphere's parameters.

Parameters

light

Light to associate with. Can be nullptr to unlink it. Light pointer must stay alive while linked (i.e. no dangling pointers)

setPreset()

void Ogre::AtmosphereNpr::setPreset

(

const Preset &

preset

)

Sets a specific preset as current.

setPresets()

void Ogre::AtmosphereNpr::setPresets

(

const PresetArray &

presets

)

Sets multiple presets at different times for interpolation We will sort the array.

You must call AtmosphereNpr::updatePreset to take effect

setSky()

void Ogre::AtmosphereNpr::setSky	(	Ogre::SceneManager *	sceneManager,
		bool	bEnabled
	)

setSunDir() [1/2]

void Ogre::AtmosphereNpr::setSunDir	(	const Ogre::Vector3 &	sunDir,
		const float	normalizedTimeOfDay
	)

More direct approach on setting time of day.

Parameters

sunDir	Sun's light direction (or moon). Will be normalized.
normalizedTimeOfDay	In range [0; 1] where 0 is when the sun goes out and 1 when it's gone.

setSunDir() [2/2]

void Ogre::AtmosphereNpr::setSunDir	(	const Radian	sunAltitude,
		const Ogre::Radian	azimuth = Radian(0.0f)
	)

Sets the time of day.

Remarks

Assumes Y is up

Parameters

sunAltitude	Altitude of the sun. At 90° the sun is facing downards (i.e. 12pm) Must* be in range [0; pi)
azimuth	Rotation around Y axis. In radians.

updatePreset()

void Ogre::AtmosphereNpr::updatePreset	(	const Ogre::Vector3 &	sunDir,
		const float	fTime
	)

After having called AtmosphereNpr::setPresets, this function will interpolate between mPresets[fTime] and mPresets[fTime+1].

Parameters

sunDir	Sun's light direction (or moon). Will be normalized.
fTime	Param. Should be in range [-1; 1] where [-1; 0] is meant to be night and [0; 1] is day

Member Data Documentation

mAtmosphereHeight

float Ogre::AtmosphereNpr::mAtmosphereHeight

How big is the "atmosphere".

Earth's thermosphere is at about 110 km.

This value must be in "units". If your engine stores the camera in millimeters, this value must be in millimeters. If your engine uses meters, this value must be in meters.

Thus the visible atmosphere is in range [mAtmosphereSeaLevel; mAtmosphereSeaLevel + mAtmosphereHeight)

mAtmosphereSeaLevel

float Ogre::AtmosphereNpr::mAtmosphereSeaLevel

When camera's height == mAtmosphereSeaLevel, the camera is considered to be at the ground i.e.

camera_height - mAtmosphereSeaLevel = 0

Regarding the unit of measurement, see mAtmosphereHeight

mConvention

AxisConvention Ogre::AtmosphereNpr::mConvention

PUBLIC VARIABLE.

This variable can be altered directly. Changes are reflected immediately.

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

• OgreAtmosphereNpr.h