Method Generate

trinity/Particle/Tr2RandomDirectionAttributeGenerator.cpp:37–67

-------------------------------------------------------------------------------------- Description: Implements ITr2AttributeGenerator interface. Generates unit-length random vector for new particle component (element). Arguments: position - Position of the "parent" particle (unused). velocity - Velocity of the "parent" particle (unused). paticle - (out) New particle data: Tr2ParticleElementData::C

//		The generator fills element identified by generator's m_name with random values.
// --------------------------------------------------------------------------------------
void Tr2RandomDirectionAttributeGenerator::Generate( const Vector3* position,
													 const Vector3* velocity,
													 float** particle )
{
	if( !m_valid )
	{
		return;
	}
	Vector4 randomDirection( 0.0f, 0.0f, 0.0f, 0.0f );
	float length = 0;
	{
		for( unsigned i = 0; i < m_element.m_dimension; ++i )
		{
			randomDirection[i] = -1.f + 2.f * Tr2ParticleSystem::RandFloat();
			length += randomDirection[i] * randomDirection[i];
		}
	}
	if( length == 0.0f )
	{
		randomDirection.x = 1.0f;
	}
	else
	{
		randomDirection /= sqrt( length );
	}
	float* data = particle[m_element.m_bufferType] + m_element.m_offset;
	for( unsigned i = 0; i < m_element.m_dimension; ++i )
	{
		data[i] = randomDirection[i];
	}
}

// --------------------------------------------------------------------------------------
// Description: