e122b34858
"The first is with Particle.cpp. I made a change so that when the lifetime is 0 (lasts forever) the sizeRange, colorRange, and alphaRange are used to create a random size, color, and alpha." "The second change is with range and SectorPlacer. The distribution of particles across the sector was not uniform. I added get_random_sqrtf() function where it is used in SectorPlacer::Place(). This seems to make the distribution uniform (at least when minimum radius is 0)."
90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library 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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* OpenSceneGraph Public License for more details.
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*/
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//osgParticle - Copyright (C) 2002 Marco Jez
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#ifndef OSGPARTICLE_RANGE_
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#define OSGPARTICLE_RANGE_ 1
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// include Export simply to disable Visual Studio silly warnings.
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#include <osgParticle/Export>
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#ifndef __sgi
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#include <cstdlib>
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#else
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#include <stdlib.h>
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#endif
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#include <osg/Vec2>
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#include <osg/Vec3>
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#include <osg/Vec4>
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//using std::rand;
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namespace osgParticle
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{
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/**
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A simple struct template useful to store ranges of values as min/max pairs.
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This struct template helps storing min/max ranges for values of any kind; class <CODE>T_</CODE> is
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the type of values to be stored, and it must support operations <CODE>T_ + T_</CODE>, <CODE>T_ - T_</CODE>,
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and <CODE>T_ * float</CODE>, otherwise the <CODE>get_random()</CODE> method will not compile.
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This struct could be extended to customize the random number generator (now it uses only
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<CODE>std::rand()</CODE>).
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*/
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template<class T_> struct range {
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/// Lower bound.
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T_ minimum;
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/// Higher bound.
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T_ maximum;
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/// Construct the object by calling default constructors for min and max.
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range() : minimum(T_()), maximum(T_()) {}
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/// Construct and initialize min and max directly.
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range(const T_ &mn, const T_ &mx) : minimum(mn), maximum(mx) {}
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/// Set min and max.
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void set(const T_ &mn, const T_ &mx) { minimum = mn; maximum = mx; }
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/// Get a random value between min and max.
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T_ get_random() const
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{
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return minimum + (maximum - minimum) * rand() / RAND_MAX;
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}
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/// Get a random square root value between min and max.
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T_ get_random_sqrtf() const
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{
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return minimum + (maximum - minimum) * sqrtf( static_cast<float>(rand()) / static_cast<float>(RAND_MAX) );
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}
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};
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/// Range of floats.
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typedef range<float> rangef;
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/// Range of osg::Vec2s.
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typedef range<osg::Vec2> rangev2;
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/// Range of osg::Vec3s.
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typedef range<osg::Vec3> rangev3;
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/// Range of osg::Vec4s.
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typedef range<osg::Vec4> rangev4;
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}
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#endif
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