rod

/*
    rod Apophysis Plugin
    Copyright 2011 Branden Brown, a.k.a. zephyrtronium

    This plugin 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 3 of the License, or
    (at your option) any later version.

    This plugin 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 for more details.

    You should have received a copy of the GNU General Public License
    along with this plugin; if not, see <http://www.gnu.org/licenses/>.
*/

typedef struct
{
    double rod_blur;

    int n; double r[4];
} Variables;

#include "apoplugin.h"

APO_PLUGIN("rod");

APO_VARIABLES(
    VAR_REAL(rod_blur, 1.25),
);

int PluginVarPrepare(Variation* vp)
{
    VAR(n) = 0;
    VAR(r)[0] = random01();
    VAR(r)[1] = random01();
    VAR(r)[2] = random01();
    VAR(r)[3] = random01();

    return TRUE;
}

int PluginVarCalc(Variation* vp)
{
    double r, sr, cr;

    fsincos(random01() * M_2PI, &sr, &cr);
    r = VAR(rod_blur) * (VAR(r)[0] + VAR(r)[1] + VAR(r)[2] + VAR(r)[3] - 2.0);
    VAR(r)[VAR(n)] = random01();
    VAR(n) = VAR(n) + 1 & 3;

    FPx += VVAR * sin(FTx + r * sr);
    FPy += r + FTy;
    FPz += VVAR * cos(FTx + r * cr);

    return TRUE;
}