Method MergeLOD

trinity/Eve/EveLODHelper.cpp:12–35

-------------------------------------------------------------------------------- Description: First calculate the LOD based on the provided sphere and frustum, then "merge" it with lod0 --------------------------------------------------------------------------------

//   it with lod0
// --------------------------------------------------------------------------------
Tr2Lod EveLODHelper::MergeLOD( Tr2Lod lod0, const Vector4& sphere, const EveUpdateContext& updateContext )
{
	auto& frustum = updateContext.GetFrustum();

	// only change something if this thing is actually visible
	if( frustum.IsSphereVisible( &sphere ) )
	{
		Tr2Lod lod1 = TR2_LOD_LOW;

		float estimatedSize = frustum.GetPixelSizeAccross( &sphere );
		if( estimatedSize >= updateContext.GetMediumDetailThreshold() )
		{
			lod1 = TR2_LOD_HIGH;
		}
		else if( estimatedSize >= updateContext.GetLowDetailThreshold() )
		{
			lod1 = TR2_LOD_MEDIUM;
		}

		// ok, merge it!
		return MergeLOD( lod0, lod1 );
	}
	return TR2_LOD_UNSPECIFIED;
}