Method Process

Engine/source/EtFramework/Systems/RigidBodySystem.cpp:77–132

-------------------------- RigidBodySystem::Process Synchronize physics transforms - if the rigid body was externally transformed, it moves the rigid body, otherwise the rigid body moves the transform

//  - if the rigid body was externally transformed, it moves the rigid body, otherwise the rigid body moves the transform
//
void RigidBodySystem::Process(ComponentRange<RigidBodySystemView>& range) 
{
	for (RigidBodySystemView& view : range)
	{
		// #todo: split non dynamic rigid bodies into a new component type, e.g ColliderComponent
		if (!(view.rigidBody->m_IsDynamic))
		{
			continue;
		}

		// extract bullet transform
		//--------------------------
		ET_ASSERT(view.rigidBody->m_Body != nullptr);

		btMotionState* const motionState = view.rigidBody->m_Body->getMotionState();
		ET_ASSERT(motionState != nullptr);

		btTransform rbTransform;
		motionState->getWorldTransform(rbTransform);

		bool modified = false;

		// #todo: deal with transform hierachy

		// deal with translations
		//--------------------------
		if (view.transf->HasTranslationChanged())
		{
			rbTransform.setOrigin(ToBtVec3(view.transf->GetPosition()));
			modified = true;
		}
		else
		{
			view.transf->SetPosition(ToEtmVec3(rbTransform.getOrigin())); // will make flags dirty
		}

		// deal with rotations
		//--------------------------
		if (view.transf->HasRotationChanged())
		{
			rbTransform.setRotation(ToBtQuat(view.transf->GetRotation()));
			modified = true;
		}
		else
		{
			view.transf->SetRotation(ToEtmQuat(rbTransform.getRotation())); // will also make flags dirty
		}

		// write back transform changes to rigid body
		//--------------------------------------------
		if (modified)
		{
			motionState->setWorldTransform(rbTransform);
		}
	}
}