54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
|
// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
|
||
|
|
// Copyright (C) 2010 Winch Gate Property Limited
|
||
|
|
//
|
||
|
|
// This program is free software: you can redistribute it and/or modify
|
||
|
|
// it under the terms of the GNU Affero General Public License as
|
||
|
|
// published by the Free Software Foundation, either version 3 of the
|
||
|
|
// License, or (at your option) any later version.
|
||
|
|
//
|
||
|
|
// This program is distributed in the hope that it will be useful,
|
||
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
// GNU Affero General Public License for more details.
|
||
|
|
//
|
||
|
|
// You should have received a copy of the GNU Affero General Public License
|
||
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
|
||
|
|
|
||
|
|
#include "std3d.h"
|
||
|
|
|
||
|
|
#include "nel/3d/mrm_level_detail.h"
|
||
|
|
|
||
|
|
|
||
|
|
namespace NL3D
|
||
|
|
{
|
||
|
|
|
||
|
|
|
||
|
|
// ***************************************************************************
|
||
|
|
void CMRMLevelDetail::compileDistanceSetup()
|
||
|
|
{
|
||
|
|
// Compute _OODistDelta.
|
||
|
|
OODistanceDelta= 1.0f / (DistanceCoarsest - DistanceFinest);
|
||
|
|
/* Compute exponent pow, such that 0.5= dMiddle^pow;
|
||
|
|
ie 0.5= e(ln dMiddle * pow)
|
||
|
|
*/
|
||
|
|
float dMiddle= (DistanceCoarsest - DistanceMiddle) * OODistanceDelta;
|
||
|
|
DistancePow= (float)(log(0.5) / log(dMiddle));
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// ***************************************************************************
|
||
|
|
float CMRMLevelDetail::getLevelDetailFromDist(float dist)
|
||
|
|
{
|
||
|
|
if(dist <= DistanceFinest)
|
||
|
|
return 1;
|
||
|
|
if(dist >= DistanceCoarsest)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
float d= (DistanceCoarsest - dist) * OODistanceDelta;
|
||
|
|
return (float)pow(d, DistancePow);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
} // NL3D
|