88 lines
4.1 KiB
C++
88 lines
4.1 KiB
C++
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/**************************************************************************************/
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/* */
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/* Visualization Library */
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/* http://visualizationlibrary.org */
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/* */
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/* Copyright (c) 2005-2020, Michele Bosi */
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/* All rights reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or without modification, */
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/* are permitted provided that the following conditions are met: */
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/* */
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/* - Redistributions of source code must retain the above copyright notice, this */
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/* list of conditions and the following disclaimer. */
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/* */
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/* - Redistributions in binary form must reproduce the above copyright notice, this */
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/* list of conditions and the following disclaimer in the documentation and/or */
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/* other materials provided with the distribution. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND */
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/* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED */
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/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
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/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR */
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/* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES */
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/* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
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/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON */
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/* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
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/* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
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/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/**************************************************************************************/
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#ifndef DistanceLODEvaluator_INCLUDE_ONCE
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#define DistanceLODEvaluator_INCLUDE_ONCE
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#include <vlGraphics/Actor.hpp>
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namespace vl
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{
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//-----------------------------------------------------------------------------
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// DistanceLODEvaluator
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//-----------------------------------------------------------------------------
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/**
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* A LODEvaluator that computes the appropriate LOD based on the distance of an
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* Actor from the Camera.
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*
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* \sa
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* - LODEvaluator
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* - PixelLODEvaluator
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*/
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class DistanceLODEvaluator: public LODEvaluator
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{
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VL_INSTRUMENT_CLASS(vl::DistanceLODEvaluator, LODEvaluator)
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public:
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DistanceLODEvaluator()
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{
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VL_DEBUG_SET_OBJECT_NAME()
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}
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virtual int evaluate(Actor* actor, Camera* camera)
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{
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if (mDistanceRangeSet.empty())
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return 0;
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vec3 center = actor->transform() ? actor->transform()->worldMatrix() * actor->lod(0)->boundingBox().center() : actor->lod(0)->boundingBox().center();
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double dist = (camera->modelingMatrix().getT() - center).length();
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// we assume the distances are sorted in increasing order
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int i=0;
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for(; i<(int)mDistanceRangeSet.size(); ++i)
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{
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if (dist<mDistanceRangeSet[i])
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return i;
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}
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return i; // == mDistanceRangeSet.size()
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}
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const std::vector<double>& distanceRangeSet() const { return mDistanceRangeSet; }
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std::vector<double>& distanceRangeSet() { return mDistanceRangeSet; }
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protected:
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std::vector<double> mDistanceRangeSet;
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};
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}
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#endif
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