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#include "UnityPrefix.h"
#include "Configuration/UnityConfigure.h"
#include "WorldParticleCollider.h"
#include "Runtime/Serialize/TransferFunctions/SerializeTransfer.h"
#include "Runtime/Geometry/Ray.h"
#include "Runtime/Input/TimeManager.h"
#include "ParticleStruct.h"
#include "Runtime/Graphics/Transform.h"
#include "Runtime/Interfaces/IRaycast.h"
using namespace std;
#pragma message ("Support collides with")
///@TODO: SUPPORT COLLIDES WITH
WorldParticleCollider::WorldParticleCollider (MemLabelId label, ObjectCreationMode mode)
: Super(label, mode)
{
}
WorldParticleCollider::~WorldParticleCollider ()
{
}
void WorldParticleCollider::Reset ()
{
Super::Reset ();
m_BounceFactor = 0.5;
m_MinKillVelocity = 0.0F;
m_CollisionEnergyLoss = 0.0F;
m_CollidesWith.m_Bits = -1;
m_SendCollisionMessage = false;
}
IMPLEMENT_CLASS (WorldParticleCollider)
IMPLEMENT_OBJECT_SERIALIZE (WorldParticleCollider)
template<class T> inline
void WorldParticleCollider::Transfer (T& transfer)
{
Super::Transfer (transfer);
TRANSFER (m_BounceFactor);
TRANSFER (m_CollisionEnergyLoss);
TRANSFER (m_CollidesWith);
TRANSFER (m_SendCollisionMessage);
transfer.Align();
TRANSFER (m_MinKillVelocity);
}
void WorldParticleCollider::UpdateParticleCollider( ParticleArray& particles, PrivateParticleInfo& privateInfo, float deltaTime )
{
int particleCount = particles.size ();
float sqrMinKillVelocity = m_MinKillVelocity * m_MinKillVelocity;
// not sure if multiplication of infinity works on every platform
AssertIf (std::numeric_limits<float>::infinity () * std::numeric_limits<float>::infinity () != std::numeric_limits<float>::infinity ());
if (privateInfo.useWorldSpace)
{
for (int i=0;i<particleCount;i++)
{
Vector3f& position = particles[i].position;
Vector3f& velocity = particles[i].velocity;
Vector3f delta = velocity * deltaTime;
float psize = 0.5f * particles[i].size;
float poffset = 0.51f * particles[i].size;
Ray ray;
ray.SetOrigin (position - delta);
float deltaLength = Magnitude (delta);
if (deltaLength < Vector3f::epsilon)
continue;
ray.SetDirection (delta / deltaLength);
float checkLen = deltaLength + psize;
float t = checkLen;
#if ENABLE_PHYSICS
HitInfo hit;
IRaycast *raycast = GetRaycastInterface();
if(raycast)
{
if(raycast->Raycast(ray, t, m_CollidesWith.m_Bits, hit))
{
Particle& particle = particles[i];
// Reflect velocity and apply velocity * time left for particle to position
// Test and factor changes into other particle collider
velocity = ReflectVector (m_BounceFactor * velocity, hit.normal);
float fractionLeftForReflection = (checkLen - t) / deltaLength;
// Place particle slightly above the surface. Otherwise in next frame raycast can
// detect collision again and reflect particle back!
position = hit.intersection + hit.normal * poffset + velocity * (deltaTime * fractionLeftForReflection);
if (m_SendCollisionMessage)
{
AssertIf (hit.colliderInstanceID == 0);
PPtr<Component> collider_pptr(hit.colliderInstanceID);
Component* collider = collider_pptr;
SendMessage (kParticleCollisionEvent, &collider->GetGameObject (), ClassID (GameObject));
collider->SendMessage (kParticleCollisionEvent, &GetGameObject (), ClassID (GameObject));
}
// Update energy
particle.energy -= m_CollisionEnergyLoss;
float sqrVelocity = SqrMagnitude (velocity);
if (particle.energy <= 0.0f || sqrVelocity < sqrMinKillVelocity) {
// Kill particle (replace particle i with last, and continue updating the moved particle)
KillParticle (particles, i);
particleCount = particles.size ();
i--;
continue;
}
privateInfo.aabb.Encapsulate (position);
}
}
#endif // ENABLE_PHYSICS
}
}
else
{
Matrix4x4f localToWorld = GetComponent (Transform).GetLocalToWorldMatrixNoScale ();
for (int i=0;i<particleCount;i++)
{
Vector3f& position = particles[i].position;
Vector3f& velocity = particles[i].velocity;
float psize = 0.5f * particles[i].size;
float poffset = 0.51f * particles[i].size;
Vector3f worldSpaceDelta = localToWorld.MultiplyVector3 (velocity * deltaTime);
Vector3f worldPosition = localToWorld.MultiplyPoint3 (position);
Ray ray;
ray.SetOrigin (worldPosition - worldSpaceDelta);
float deltaLength = Magnitude (worldSpaceDelta);
if (deltaLength < Vector3f::epsilon)
continue;
ray.SetDirection (worldSpaceDelta / deltaLength);
float checkLen = deltaLength + psize;
float t = checkLen;
#if ENABLE_PHYSICS
HitInfo hit;
IRaycast *raycast = GetRaycastInterface();
if(raycast)
{
if(raycast->Raycast(ray, t, m_CollidesWith.m_Bits, hit))
{
Particle& particle = particles[i];
// Reflect velocity and apply velocity * time left for particle to position
Vector3f worldVelocity = localToWorld.MultiplyVector3 (velocity);
// Test and factor changes into other particle collider
worldVelocity = ReflectVector (m_BounceFactor * worldVelocity, hit.normal);
float fractionLeftForReflection = (checkLen - t) / deltaLength;
// Place particle slightly above the surface. Otherwise in next frame raycast can
// detect collision again and reflect particle back!
worldPosition = hit.intersection + hit.normal * poffset + worldVelocity * (deltaTime * fractionLeftForReflection);
position = localToWorld.InverseMultiplyPoint3Affine (worldPosition);
velocity = localToWorld.InverseMultiplyVector3Affine (worldVelocity);
if (m_SendCollisionMessage)
{
AssertIf (hit.colliderInstanceID == 0);
PPtr<Component> collider_pptr(hit.colliderInstanceID);
Component* collider = collider_pptr;
SendMessage (kParticleCollisionEvent, &collider->GetGameObject (), ClassID (GameObject));
collider->SendMessage (kParticleCollisionEvent, &GetGameObject (), ClassID (GameObject));
}
// Update energy
particle.energy -= m_CollisionEnergyLoss;
float sqrVelocity = SqrMagnitude (velocity);
if (particle.energy <= 0.0f || sqrVelocity < sqrMinKillVelocity) {
// Kill particle (replace particle i with last, and continue updating the moved particle)
KillParticle (particles, i);
particleCount = particles.size ();
i--;
continue;
}
privateInfo.aabb.Encapsulate (position);
}
}
#endif // ENABLE_PHYSICS
}
}
}
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