C++ (Cpp) calculateSeparatingVelocity示例

示例#1

文件： ParticleContact_2D.cpp 项目： kevinteynor/bsgd_engine

void ParticleContact_2D::resolveVelocity()
{
	if(p2 && contactNormal == glm::vec2(0,0))
		contactNormal = glm::normalize(p1->Position - p2->Position);
	
	float separatingVelocity = calculateSeparatingVelocity();
	if(separatingVelocity > 0) return;
	
	float velocityFromAcceleration = glm::dot(p1->Acceleration, contactNormal) * UpdateClock::DeltaTime();
	if(p2) velocityFromAcceleration += glm::dot(p2->Acceleration, contactNormal) * UpdateClock::DeltaTime();
	
	if(velocityFromAcceleration < 0)
	{
		// remove any closing velocity due to acceleration.
		separatingVelocity -= velocityFromAcceleration;
	}
	
	float totalInverseMass = p1->InverseMass;
	if(p2) totalInverseMass += p2->InverseMass;
	float totalImpulse = (-separatingVelocity) * (restitution + 1) / totalInverseMass;

	glm::vec2 directionalImpulse = totalImpulse * contactNormal;
	
	p1->AddImpulse(directionalImpulse);
	if(p2) p2->AddImpulse(-directionalImpulse);
	
}

示例#2

文件： PContact.cpp 项目： danlangridge/gravel-engine

void ParticleContact::resolveVelocity(float t) {
  float separatingVelocity = calculateSeparatingVelocity();

  if (separatingVelocity > 0) return;
  
  float newSepVelocity = -separatingVelocity*restitution;
  float deltaVelocity = newSepVelocity - separatingVelocity; 
  float totalInverseMass = particle[0]->getInverseMass();

  if (particle[1]) totalInverseMass += particle[1]->getInverseMass();
  if (totalInverseMass <= 0) return;

  float impulse = deltaVelocity / totalInverseMass;

  Vector impulsePerIMass = contactNormal * impulse;

  particle[0]->setVelocity(particle[0]->getVelocity() + 
  impulsePerIMass*particle[0]->getInverseMass());

  if (particle[1]) {
    particle[1]->setVelocity(particle[1]->getVelocity() + 
    impulsePerIMass* -particle[1]->getInverseMass());
  }
}