Method UpdateTransform

trinity/Tr2PrimitiveSet.cpp:109–166

}

void Tr2PrimitiveSet::UpdateTransform( void )
{
	Matrix finalTransform;
	Matrix scale_mat = IdentityMatrix();
	Matrix view = Tr2Renderer::GetViewTransform();

	if( m_scaleByDistanceToView )
	{
		// How much to scale the lineset based on the distance to the eye position
		Vector3 viewPos = Tr2Renderer::GetViewPosition();
		Vector3 lineSetPos = Vector3( m_localTransform._41, m_localTransform._42, m_localTransform._43 );
		Vector3 normal = Vector3( view._13, view._23, view._33 );
		Vector3 dir( viewPos - lineSetPos );
		m_scale = fabs( Dot( dir, normal ) * g_primitiveDistanceScaleMultiplier * Tr2Renderer::GetFieldOfView() );
		scale_mat = ScalingMatrix( m_scale, m_scale, m_scale );
		finalTransform = scale_mat * m_localTransform;
	}
	else
	{
		m_scale = 1.0f;
	}

	if( m_viewOriented )
	{
		// The primitives need to be oriented in such a way
		// as you were drawing on a x,y plane
		Matrix rotation = IdentityMatrix();
		rotation._11 = view._11;
		rotation._12 = view._21;
		rotation._13 = view._31;
		rotation._21 = view._12;
		rotation._22 = view._22;
		rotation._23 = view._32;
		rotation._31 = view._13;
		rotation._32 = view._23;
		rotation._33 = view._33;

		// Need to scale the matrix before we translate it...
		finalTransform = scale_mat * rotation;

		finalTransform._41 = m_localTransform._41;
		finalTransform._42 = m_localTransform._42;
		finalTransform._43 = m_localTransform._43;
	}
	else
	{
		if( m_scaleByDistanceToView )
		{
			finalTransform = scale_mat * m_localTransform;
		}
		else
		{
			finalTransform = m_localTransform;
		}
	}

	m_worldTransform = finalTransform;
}