vcglib/apps/nexus/metric.h

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/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2004 \/)\/ *
* Visual Computing Lab /\/| *
* ISTI - Italian National Research Council | *
* \ *
* All rights reserved. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 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 General Public License (http://www.gnu.org/licenses/gpl.txt) *
* for more details. *
* *
****************************************************************************/
/****************************************************************************
History
$Log: not supported by cvs2svn $
2005-02-22 11:38:17 +01:00
Revision 1.8 2005/02/21 20:49:30 ponchio
some culling bug.
2005-02-21 21:49:35 +01:00
Revision 1.7 2005/02/20 19:49:44 ponchio
cleaning (a bit more).
2005-02-20 20:49:44 +01:00
Revision 1.6 2005/02/20 18:07:01 ponchio
cleaning.
2005-02-20 19:07:01 +01:00
Revision 1.5 2005/02/19 16:22:45 ponchio
Minor changes (visited and Cell)
2005-02-19 17:22:45 +01:00
Revision 1.4 2005/02/08 12:43:03 ponchio
Added copyright
2005-02-08 13:43:03 +01:00
****************************************************************************/
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#ifndef NXS_METRIC_H
#define NXS_METRIC_H
#include <wrap/gui/frustum.h>
#include <vcg/space/sphere3.h>
#include "nexus.h"
namespace nxs {
enum MetricKind { FRUSTUM, FLAT, DELTA };
class Metric {
public:
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vcg::Frustumf frustum;
bool culling;
Metric(): culling(true) {}
virtual void GetView() { frustum.GetView(); }
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virtual float GetError(Entry &entry, bool &visible) = 0;
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};
class FlatMetric: public Metric {
public:
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float GetError(Entry &entry, bool &visible) {
visible = true;
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return entry.error;
}
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};
class FrustumMetric: public Metric {
public:
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float GetError(Entry &entry, bool &visible) {
visible = true;
vcg::Sphere3f &sph = entry.sphere;
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) {
float remote = frustum.Remoteness(sph.Center(), sph.Radius());
if(remote > 0) {
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// TODO FIXME remoteness is bugged... (not much only bit
//if we are close to the surface, the projection of
//the bounding sphere in screen space comes out too small
//just using resolution and radius. Im too lazy to fix it.
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if(frustum.IsOutside(sph.Center(), sph.Radius()))
visible = false;
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error /= remote;
} else if(entry.cone.Backface(sph, frustum.ViewPoint())) {
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visible = false;
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}
}
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return error;
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}
};
}
#endif