UINT8 LightTrueLevel( INT32 sGridNo, INT16 bLevel )
{
	LEVELNODE * pNode;
	INT32 iSum;

	if (bLevel == 0)
	{
		pNode = gpWorldLevelData[sGridNo].pLandHead;
	}
	else
	{
		pNode = gpWorldLevelData[sGridNo].pRoofHead;
	}

	if (pNode == NULL)
	{
		return( ubAmbientLightLevel );
	}
	else
	{
		iSum=pNode->ubNaturalShadeLevel - (pNode->ubSumLights - pNode->ubFakeShadeLevel );

		if(gGameExternalOptions.fStaticShadowsDecreaseBrightness && ( gRenderFlags & RENDER_FLAG_SHADOWS ))
		{
			INT32 sNewGridNo = NewGridNo( sGridNo, (UINT16)DirectionInc( NORTH ) );
			STRUCTURE* pStructure = gpWorldLevelData[ sNewGridNo ].pStructureHead;
			if(pStructure != NULL)
			{
				LEVELNODE* pShadowNode = NULL;
				if(!(pStructure->fFlags & STRUCTURE_BASE_TILE))
					pShadowNode = gpWorldLevelData[ FindBaseStructure(pStructure)->sGridNo ].pShadowHead;
				else
					pShadowNode = gpWorldLevelData[ sNewGridNo ].pShadowHead;
				if(pShadowNode != NULL)
				{
					iSum += max( 0, (StructureHeight(pStructure) - 1 ) );
				}
			}
		}
		iSum=__min(SHADE_MIN, iSum);
		iSum=__max(SHADE_MAX, iSum);
		return( (UINT8) iSum );
	}
}