Particles System

最近在看Gamebryo的粒子系统，来点Demo试试，嘿嘿。

Demo结构，Class ParticlesShow & Class Particles Manager。简单的两个类先试试，后面再进行修改。

/*************************************************************************FileName: PartilcesShow.hCreated: 2010/11/21Author: OCEAN*************************************************************************/#pragma once#include <NiSample.h>#include "ParticlesManager.h"class NiCamera;class PartilcesShow :public NiSample{public:PartilcesShow(void);~PartilcesShow(void);virtual void UpdateFrame();virtual void Terminate();protected:virtual bool CreateScene();virtual bool CreateUIElements();//For UI ElementNiUIMemberSlot1<PartilcesShow, float> m_kAnimationSpeed;protected:float m_fCustomAccumTime;float m_fAnimationSpeed;void UpdateAnimationSpeed(float fSpeed);private:ParticlesManagerPtr m_spParticlsManager;};//------------------------------------------------------------------------

/*************************************************************************FileName: PartilcesShow.cppCreated: 2010/11/21Author: OCEAN*************************************************************************/#include "PartilcesShow.h"#include <NiParticle.h>//NOTE: include the NiParticle.h, why? if not, Error#include <NiUIManager.h>#include <NiLicense.h>#include "NiUISlider.h"NiEmbedGamebryoLicenseCode;//------------------------------------------------------------------------NiApplication* NiApplication::Create(){return NiNew PartilcesShow;}//------------------------------------------------------------------------PartilcesShow::PartilcesShow(void):NiSample("ParticlesShow",D3DPOOL_DEFAULT,DEFAULT_HEIGHT,true),m_fCustomAccumTime(0.0f),m_fAnimationSpeed(1.0f){m_spParticlsManager = NiNew ParticlesManager;//For UI Elementm_kAnimationSpeed.Initialize(this,&PartilcesShow::UpdateAnimationSpeed);}PartilcesShow::~PartilcesShow(void){}//------------------------------------------------------------------------bool PartilcesShow::CreateScene(){// Check for support of multiple render targetsif (m_spRenderer->GetMaxBuffersPerRenderTargetGroup() < 2){NiMessageBox("This application cannot run because it the current ""graphics hardware does not support multiple render targets.", "Hardware Support Error");return false;}#if defined(WIN32)// DX9 renderer cannot support MSAA with multiple render targetsif (NiIsKindOf(NiDX9Renderer, m_spRenderer)){Ni2DBuffer* pkBackbuffer = m_spRenderer->GetDefaultBackBuffer();if (pkBackbuffer->GetMSAAPref() != Ni2DBuffer::MULTISAMPLE_NONE){NiMessageBox("This application cannot run under DX9 with MSAA ""enabled because it makes use of multiple render targets.", "MSAA Not Supported");return false;}}// Thi D3D10 sample demo was not written to run with MSAA and MRT.else if (m_spRenderer &&m_spRenderer->GetRendererID() == NiSystemDesc::RENDERER_D3D10){Ni2DBuffer* pkBackbuffer = m_spRenderer->GetDefaultBackBuffer();if (pkBackbuffer->GetMSAAPref() != Ni2DBuffer::MULTISAMPLE_NONE){NiMessageBox("This application is not intended to run under""D3D10 with MultiSampling enabled.","MSAA Not Supported.");return false;}}#endif// Add alpha sortingm_spRenderer->SetSorter(NiNew NiAlphaAccumulator);// Create the scenem_spScene = NiNew NiNode;m_spCamera->SetTranslate(-100.0f,0.0f,0.0f);m_spCamera->LookAtWorldPoint(NiPoint3(0.0f,0.0f,0.0f),NiPoint3(0.0f,0.0f,1.0f));NiFrustum kFrustum = m_spCamera->GetViewFrustum();kFrustum.m_fFar = 3000.0f;m_spScene->Update(0.0f);m_spParticlsManager->Init(m_spScene,m_fCurrentTime);return true;}void PartilcesShow::UpdateFrame(){NiSample::UpdateFrame();m_fCustomAccumTime += m_fFrameTime * m_fAnimationSpeed;m_spScene->Update(m_fCustomAccumTime);}void PartilcesShow::Terminate(){m_spParticlsManager = NULL;NiSample::Terminate();}bool PartilcesShow::CreateUIElements(){if (!NiSample::CreateUIElements())return false;unsigned int uiX, uiY;m_spRenderer->GetOnScreenCoord(0.0f, 0.0f, 0, 0, uiX, uiY, NiRenderer::CORNER_TOP_LEFT);float fCurHeight = m_kUIElementGroupOffset.y;float fOffset = m_kUIElementGroupOffset.x;float fElementWidth = m_fUIElementWidth;NiUIGroup* pkUIGroup = NiNew NiUIGroup("Options", m_fUIGroupHeaderHeight);{NiUISlider* pkSlider = NiNew NiUISlider("Animation Speed", m_fAnimationSpeed, 0.0f, 3.0f, 7);pkSlider->SetOffset(fOffset, fCurHeight);pkSlider->SetDimensions(fElementWidth, m_fUIElementHeight);pkSlider->SubscribeToValueChangedEvent(&m_kAnimationSpeed);pkUIGroup->AddChild(pkSlider);fCurHeight += m_fUIElementHeight;}AddDefaultUIElements(pkUIGroup, fOffset, fCurHeight, fElementWidth,m_fUIElementHeight);float fGroupWidth = fElementWidth + 2.0f * fOffset;pkUIGroup->SetOffset(1.0f - fGroupWidth, 0.0f);pkUIGroup->SetDimensions(fGroupWidth, fCurHeight + 0.5f * m_fUIElementHeight);pkUIGroup->UpdateRect();NiUIManager::GetUIManager()->AddUIGroup(pkUIGroup);return true;}void PartilcesShow::UpdateAnimationSpeed(float fSpeed){m_fAnimationSpeed = fSpeed;}//-----------------------------------------------------------------------

/*************************************************************************FileName: ParticlesManager.hCreated: 2010/11/21Author: OCEAN*************************************************************************/#pragma once#include <NiRefObject.h>#include <NiSmartPointer.h>#include <NiPSEmitter.h>#include "NiPSParticleSystem.h"#include "NiNode.h"class ParticlesManager : public NiRefObject{public:ParticlesManager(void);~ParticlesManager(void);bool Init(NiNodePtr spScene, float fAccumTime);private:NiPSParticleSystemPtr m_spParticlesSystem;NiPSEmitter *m_pPSEmitter;};NiSmartPointer(ParticlesManager);//************************************************************************

/*************************************************************************FileName: ParticlesManager.cppCreated: 2010/11/21Author: OCEAN*************************************************************************/#include "ParticlesManager.h"#include "NiPSBoxEmitter.h"#include "NiVertexColorProperty.h"#include "NiFloatInterpolator.h"#include "NiStepBoolKey.h"#include "NiBoolData.h"#include "NiBoolInterpolator.h"#include "NiPSEmitParticlesCtlr.h"#include "NiPSSimulatorGeneralStep.h"#include "NiPSSimulatorForcesStep.h"#include "NiPSGravityForce.h"#include "NiPSSimulatorCollidersStep.h"#include "NiPSPlanarCollider.h"//------------------------------------------------------------------------ParticlesManager::ParticlesManager(void){}ParticlesManager::~ParticlesManager(void){m_spParticlesSystem = NULL;}//------------------------------------------------------------------------bool ParticlesManager::Init(NiNodePtr spScene, float fAccumTime){// Create and attach particle system object.NiUInt32 uiMaxNumParticles = 120;NiPSParticleSystem::AlignMethod eNormalMethod = NiPSParticleSystem::ALIGN_CAMERA;NiPoint3 kNormalDirection = NiPoint3::ZERO;NiPSParticleSystem::AlignMethod eUpMethod = NiPSParticleSystem::ALIGN_CAMERA;NiPoint3 kUpDirection = NiPoint3::ZERO;bool bHasLivingSpawner = false;bool bHasColors = true;bool bHasRotations = true;bool bHasAnimatedTextures = false;bool bWorldSpace = true;bool bDynamicBounds = true;bool bCreateDefaultGenerator = true;bool bAttachMeshModifiers = true;m_spParticlesSystem = NiPSParticleSystem::Create(uiMaxNumParticles,eNormalMethod,kNormalDirection,eUpMethod,kUpDirection,bHasLivingSpawner,bHasColors,bHasRotations,bHasAnimatedTextures,bWorldSpace,bDynamicBounds,bCreateDefaultGenerator,bAttachMeshModifiers);spScene->AttachChild(m_spParticlesSystem);// Create and add vertex color property.NiVertexColorProperty* pkVertColorProp = NiNew NiVertexColorProperty;pkVertColorProp->SetLightingMode(NiVertexColorProperty::LIGHTING_E);pkVertColorProp->SetSourceMode(NiVertexColorProperty::SOURCE_EMISSIVE);m_spParticlesSystem->AttachProperty(pkVertColorProp);// Create and attach emitter node.NiNodePtr pEmitterNode = NiNew NiNode;pEmitterNode->SetTranslate(-10.0f, 0.0f, 0.0f);spScene->AttachChild(pEmitterNode);// Create and add emitter.NiFixedString kEmitterName("Box Emitter");float fEmitterWidth = 2.0f;float fEmitterHeight = 2.0f;float fEmitterDepth = 2.0f;float fSpeed = 10.0f;float fSpeedVar = 2.5f;float fSpeedFlipRatio = 0.0f;float fDeclination = 0.0f;float fDeclinationVar = NI_PI * 0.25f;float fPlanarAngle = 0.0f;float fPlanarAngleVar = NI_PI;float fSize = 2.0f;float fSizeVar = 0.0f;float fLifeSpan = 2.0f;float fLifeSpanVar = 1.0f;float fRotAngle = 0.0f;float fRotAngleVar = 2.0f * NI_PI;float fRotSpeed = NI_PI;float fRotSpeedVar = NI_PI;bool bRandomRotSpeedSign = true;NiPoint3 kRotAxis(NiPoint3::ZERO);bool bRandomRotAxis = true;m_pPSEmitter = NiNew NiPSBoxEmitter(kEmitterName,fEmitterWidth,fEmitterHeight,fEmitterDepth,pEmitterNode,fSpeed,fSpeedVar,fSpeedFlipRatio,fDeclination,fDeclinationVar,fPlanarAngle,fPlanarAngleVar,fSize,fSizeVar,fLifeSpan,fLifeSpanVar,fRotAngle,fRotAngleVar,fRotSpeed,fRotSpeedVar,bRandomRotSpeedSign,kRotAxis,bRandomRotAxis);m_spParticlesSystem->AddEmitter(m_pPSEmitter);//TODO: use the NiPSEmitParticlesCtlr to emit particles// Programmatically emit particles from the emitter.//float fTime = fAccumTime;//NiUInt32 uiNumParticles = 5;//float* pfAges = NiAlloc(float, uiNumParticles);//pfAges[0] = 0.4f;//pfAges[1] = 0.3f;//pfAges[2] = 0.2f;//pfAges[3] = 0.1f;//pfAges[4] = 0.0f;//m_pPSEmitter->EmitParticles(m_spParticlesSystem,fTime, uiNumParticles, pfAges); // Create a particle emission controller that has a fixed birth rate of// 30.0 particles per second and is active from time -2.0 to time 1.0 and// from time 2.0 to time 3.0.float fBirthRate = 30.0f;NiFloatInterpolator* pkBirthRateInterpolator = NiNew NiFloatInterpolator(fBirthRate);NiUInt32 uiNumEmitterActiveKeys = 4;NiStepBoolKey* pkEmitterActiveKeys =NiNew NiStepBoolKey[uiNumEmitterActiveKeys];pkEmitterActiveKeys[0].SetTime(-2.0f);pkEmitterActiveKeys[0].SetBool(true);pkEmitterActiveKeys[1].SetTime(1.0f);pkEmitterActiveKeys[1].SetBool(false);pkEmitterActiveKeys[2].SetTime(2.0f);pkEmitterActiveKeys[2].SetBool(true);pkEmitterActiveKeys[3].SetTime(3.0);pkEmitterActiveKeys[3].SetBool(false);NiBoolData* pkEmitterActiveData = NiNew NiBoolData;pkEmitterActiveData->ReplaceAnim(pkEmitterActiveKeys,uiNumEmitterActiveKeys, NiBoolKey::STEPKEY);NiBoolInterpolator* pkEmitterActiveInterpolator = NiNew NiBoolInterpolator(pkEmitterActiveData);NiPSEmitParticlesCtlr* pkEmitParticlesCtlr = NiNew NiPSEmitParticlesCtlr(kEmitterName);pkEmitParticlesCtlr->SetBirthRateInterpolator(pkBirthRateInterpolator);pkEmitParticlesCtlr->SetEmitterActiveInterpolator(pkEmitterActiveInterpolator);pkEmitParticlesCtlr->ResetTimeExtrema();pkEmitParticlesCtlr->SetCycleType(NiTimeController::LOOP);pkEmitParticlesCtlr->SetTarget(m_spParticlesSystem);// Start the particle with a size of 0. Have it grow to twice its size// by the time its life is half over. Then have it start shrinking to // its original size by the time it dies.NiPSSimulatorGeneralStep* pkGeneralStep = NiGetSimulatorStep(NiPSSimulatorGeneralStep, m_spParticlesSystem->GetSimulator());NIASSERT(pkGeneralStep);NiUInt8 ucNumSizeKeys = 3;NiPSKernelFloatKey* pkSizeKeys = NiAlloc(NiPSKernelFloatKey,ucNumSizeKeys);pkSizeKeys[0].m_fTime = 0.0f;pkSizeKeys[0].m_fValue = 0.0f;pkSizeKeys[1].m_fTime = 0.5f;pkSizeKeys[1].m_fValue = 2.0f;pkSizeKeys[2].m_fTime = 1.0f;pkSizeKeys[2].m_fValue = 1.0;pkGeneralStep->CopySizeKeys(pkSizeKeys, ucNumSizeKeys);NiFree(pkSizeKeys); // Add color animation keys to the particle system. Note that the// CopyColorKeys function does not take ownership of the animation key// array, so the array must be deleted after the keys have been set.NiUInt8 ucNumColorKeys = 3;NiPSKernelColorKey* pkColorKeys = NiAlloc(NiPSKernelColorKey,ucNumColorKeys);pkColorKeys[0].m_fTime = 0.0f;pkColorKeys[0].m_kColor = NiRGBA::WHITE;pkColorKeys[1].m_fTime = 0.5f;pkColorKeys[1].m_kColor = NiRGBA(255, 0, 0, 255);pkColorKeys[2].m_fTime = 1.0f;pkColorKeys[2].m_kColor = NiRGBA::BLACK;pkGeneralStep->CopyColorKeys(pkColorKeys, ucNumColorKeys);NiFree(pkColorKeys);// Add a gravity force. We will indicate the gravity direction as being// along the negative z-axis.NiPSSimulatorForcesStep* pkForcesStep = NiGetSimulatorStep(NiPSSimulatorForcesStep, m_spParticlesSystem->GetSimulator());NIASSERT(pkForcesStep);NiPoint3 kGravityAxis = -NiPoint3::UNIT_Z;float fDecay = 0.0f;float fStrength = 9.8f;NiPSForceDefinitions::GravityData::ForceType eForceType =NiPSForceDefinitions::GravityData::FORCE_PLANAR;float fTurbulence = 0.0f;float fTurbulenceScale = 1.0f;pkForcesStep->AddForce(NiNew NiPSGravityForce("Gravity",pEmitterNode,kGravityAxis,fDecay,fStrength,eForceType,fTurbulence,fTurbulenceScale));// Add a colliding plane. We will position the collider centered around the given node.NiPSSimulatorCollidersStep* pkColliderStep = NiGetSimulatorStep(NiPSSimulatorCollidersStep, m_spParticlesSystem->GetSimulator());NIASSERT(pkColliderStep);float fBounce = 1.0f;bool bSpawnOnCollide = false;bool bDieOnCollide = false;NiPSSpawner* pkSpawner = NULL;float fWidth = 10.0f;float fHeight = 10.0f;NiPoint3 kXAxis = NiPoint3::UNIT_X;NiPoint3 kYAxis = NiPoint3::UNIT_Y;pkColliderStep->AddCollider(NiNew NiPSPlanarCollider(fBounce,bSpawnOnCollide,bDieOnCollide,pkSpawner,pEmitterNode,fWidth,fHeight,kXAxis,kYAxis));return true;}//------------------------------------------------------------------------

 

Demo 运行的结果简单放在这边。