standalone/geoisosurface.C

/*
 * Copyright (c) 2024
 *      Side Effects Software Inc.  All rights reserved.
 *
 * Redistribution and use of Houdini Development Kit samples in source and
 * binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. The name of Side Effects Software may not be used to endorse or
 *    promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY SIDE EFFECTS SOFTWARE `AS IS' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 * NO EVENT SHALL SIDE EFFECTS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *----------------------------------------------------------------------------
 */

#include <GU/GU_Detail.h>
#include <UT/UT_Exit.h>
#include <UT/UT_Main.h>
#include <stddef.h>

namespace HDK_Sample {

static float
densityFunction(const UT_Vector3 &P, void *data)
{
    // Return the signed distance to the unit sphere
    return 1 - P.length();
}

}

int
theMain(int argc, char *argv[])
{
    GU_Detail           gdp;
    UT_BoundingBox      bounds;

    // Evaluate the iso-surface inside this bounding box
    bounds.setBounds(-1, -1, -1, 1, 1, 1);

    // Create an iso-surface
    gdp.polyIsoSurface(HDK_Sample::densityFunction, NULL, bounds, 20, 20, 20);

    // Save to sphere.bgeo
    gdp.save("sphere.bgeo", NULL);

    UT_Exit::exit(UT_Exit::EXIT_OK); // exit with proper tear down
    return 0;
}
UT_MAIN(theMain);