91 lines
3.2 KiB
C++
91 lines
3.2 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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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 General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (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 General Public License (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/****************************************************************************
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History
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$Log: not supported by cvs2svn $
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Revision 1.5 2005/02/19 16:22:45 ponchio
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Minor changes (visited and Cell)
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Revision 1.4 2005/02/08 12:43:03 ponchio
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Added copyright
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****************************************************************************/
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#ifndef NXS_METRIC_H
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#define NXS_METRIC_H
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#include <wrap/gui/frustum.h>
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#include <vcg/space/sphere3.h>
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#include "nexus.h"
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namespace nxs {
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enum MetricKind { FRUSTUM, FLAT, DELTA };
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class Metric {
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public:
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vcg::Frustumf frustum;
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bool culling;
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Metric(): culling(true) {}
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virtual void GetView() { frustum.GetView(); }
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virtual float GetError(Entry &entry, bool &visible) = 0;
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};
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class FlatMetric: public Metric {
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public:
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float GetError(Entry &entry, bool &visible) {
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visible = true;
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return entry.error;
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}
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};
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class FrustumMetric: public Metric {
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public:
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float GetError(Entry &entry, bool &visible) {
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visible = true;
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vcg::Sphere3f &sph = entry.sphere;
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float dist = (sph.Center() - frustum.ViewPoint()).Norm() - sph.Radius();
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if(dist < 0) return 1e20f;
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float error = entry.error/frustum.Resolution(dist);
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if(culling) {
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float remote = frustum.Remoteness(sph.Center(), sph.Radius());
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if(remote > 0) {
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visible = false;
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error /= remote;
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} else if(entry.cone.Backface(sph, frustum.ViewPoint())) {
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visible = false;
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}
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}
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return error;
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}
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};
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}
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#endif
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