packedsphere/packedsphere.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 <UT/UT_Args.h>
#include <UT/UT_Main.h>
#include <UT/UT_Options.h>
#include <GU/GU_Detail.h>
#include <GU/GU_PrimPacked.h>
#include <GT/GT_Types.h>

static void
usage(const char *program)
{
    fprintf(stderr, "Usage: %s [options]\n", program);
    fprintf(stderr, "Options:\n");
    fprintf(stderr, "  -l lod   Sphere level of detail   [default: 3]\n");
    fprintf(stderr, "  -o file  Save geometry to file    [default: stdout.geo]\n");
    fprintf(stderr, "  -v vlod  Viewport level of detail [default: 'full']\n");
    fprintf(stderr, "           Choose one of:\n");
    for (int i = 0; i < GEO_VIEWPORT_NUM_MODES; ++i)
    {
        fprintf(stderr, "               - %s\n", GEOviewportLOD((GEO_ViewportLOD)i));
    }
}

int
theMain(int argc, char *argv[])
{
    // Make sure to install the GU plug-ins
    GU_Detail::loadIODSOs();

#if !defined(WIN32)
    // The following line of code is just to force linking of GT library on
    // Linux.  If this doesn't exist, there might be linking errors when trying
    // to load GU_PackedSphere.so (set HOUDINI_DSO_ERROR to 1 or larger to see)
    //
    // Since GU_PackedSphere.so isn't linked against any libraries, library
    // availability becomes dependent on the order that plugins are loaded.
    // Another solution to this problem would be to specify the libraries
    // required when linking the .so file.
    if (argc == 1<<28)
        printf("%s\n", GTstorage(GT_STORE_UINT8));
#endif

    // Process command line arguments
    UT_Args     args;
    args.initialize(argc, argv);
    args.stripOptions("l:o:v:h");

    if (args.found('h'))
    {
        usage(argv[0]);
        return 1;
    }

    const char  *output = args.found('o') ? args.argp('o') : "stdout.geo";
    int          lod = args.found('l') ? args.iargp('l') : 3;
    const char  *viewportLOD = args.found('v') ? args.argp('v') : "full";
    GU_Detail    gdp;

    // Create a packed sphere primitive
    GU_PrimPacked *pack = GU_PrimPacked::build(gdp, "PackedSphere");
    if (!pack)
        fprintf(stderr, "Can't create a packed sphere\n");
    else
    {
        // Set the location of the packed primitive's point.
        UT_Vector3 pivot(0, 0, 0);
        pack->setPivot(pivot);
        gdp.setPos3(pack->getPointOffset(0), pivot);

        // Set the options on the sphere primitive
        UT_Options options;
        options.setOptionI("lod", lod);
        pack->hardenImplementation()->update(pack, options);
        pack->setViewportLOD(GEOviewportLOD(viewportLOD));

        // Save the geometry.  With the .so file installed, this should load
        // into Houdini and should be rendered by mantra.
        if (!gdp.save(output, NULL).success())
            fprintf(stderr, "Error saving to: %s\n", output);
    }
    return 0;
}
UT_MAIN(theMain);