Method UpdateViewDependentData

trinity/Tr2Transform.cpp:42–248

}

void Tr2Transform::UpdateViewDependentData( const TriFrustum& frustum, const Matrix& parentTransform )
{
	Vector3 finalScale;
	if( m_useDistanceBasedScale )
	{
		Vector3 myPos = TransformCoord( m_translation, parentTransform );

		const Vector3& camPos = Tr2Renderer::GetViewPosition();
		Vector3 d = myPos - camPos;
		const float dist = Length( d );
		const float fov = Tr2Renderer::GetFieldOfView();

		//fovHeight is the thing to multiply with to let the object
		//always keep the same height on screen
		const float fovHeight = sinf( fov / 2.0f ) * dist;

		//this is the number we want to reduce it by
		const float scaler = m_distanceBasedScaleArg1 / powf( fovHeight, m_distanceBasedScaleArg2 );
		const float scale = scaler * fovHeight;

		finalScale = m_scaling * scale;
	}
	else
	{
		finalScale = m_scaling;
	}
	m_lastWorldTransform = m_worldTransform;
	m_localTransform = TransformationMatrix( finalScale, m_rotation, m_translation );
	m_worldTransform = m_localTransform * parentTransform;

	switch( m_modifier )
	{
	case TR2TM_BILLBOARD:
	case TR2TM_SIMPLE_HALO: {
		float parentScaleX = Length( parentTransform.GetX() );
		float parentScaleY = Length( parentTransform.GetY() );
		float parentScaleZ = Length( parentTransform.GetZ() );
		finalScale.x *= parentScaleX;
		finalScale.y *= parentScaleY;
		finalScale.z *= parentScaleZ;

		if( m_modifier == TR2TM_SIMPLE_HALO )
		{
			const Vector3& myPos = m_worldTransform.GetTranslation();
			const Vector3& camPos = Tr2Renderer::GetViewPosition();
			Vector3 d = camPos - myPos;

			Vector3 backward;

			float scale = Dot(
				Normalize( d ),
				Normalize( *TriVectorRotatedBasisMatrix( &backward, TRITA_Z, &m_worldTransform ) ) );

			if( scale < 0.0f )
			{
				scale = 0.0f;
			}