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