samples/VRAY/VRAY_DemoStamp.C

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/*
 * Copyright (c) 2012
 *      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.
 *
 *----------------------------------------------------------------------------
 * This is a sample procedural DSO
 */

#include <GU/GU_Detail.h>
#include "VRAY_DemoStamp.h"

// The vray_ChildBox is a "private" procedural.
// The user can't allocate one of these directly.
namespace HDK_Sample {
/// @brief Procedural used in @ref VRAY/VRAY_DemoStamp.C to render a box
/// @see @ref VRAY/VRAY_DemoBox.C
class vray_ChildBox : public VRAY_Procedural {
public:
    vray_ChildBox(UT_Vector3 &center, fpreal size)
        : myCenter(center),
          mySize(size)
    {}
    virtual ~vray_ChildBox() {}

    virtual const char  *getClassName() { return "vray_ChildBox"; }
                         /// Since the procedural is generated by stamp, this
                         /// method will never be called.
    virtual int          initialize(const UT_BoundingBox *)
                         {
                             return 0;
                         }
    virtual void         getBoundingBox(UT_BoundingBox &box)
                         {
                             box.initBounds(myCenter);
                             box.enlargeBounds(0, mySize);
                         }
    virtual void         render()
                         {
                             GU_Detail  *gdp = allocateGeometry();
                             gdp->cube(
                                     myCenter.x()-mySize, myCenter.x()+mySize,
                                     myCenter.y()-mySize, myCenter.y()+mySize,
                                     myCenter.z()-mySize, myCenter.z()+mySize);
                             openGeometryObject();
                                addGeometry(gdp, 0);
                             closeObject();
                         }
private:
    UT_Vector3  myCenter;
    fpreal      mySize;
};
}       // End HDK_Sample namespace

using namespace HDK_Sample;

// Arguments for the stamp procedural
static VRAY_ProceduralArg       theArgs[] = {
    VRAY_ProceduralArg("minbound",      "real", "-1 -1 -1"),
    VRAY_ProceduralArg("maxbound",      "real", "1 1 1"),
    VRAY_ProceduralArg("size",          "real", ".1"),
    VRAY_ProceduralArg("npoints",       "int",  "10"),
    VRAY_ProceduralArg("seed",          "int",  "1"),
    VRAY_ProceduralArg()
};

VRAY_Procedural *
allocProcedural(const char *)
{
    return new VRAY_DemoStamp();
}

const VRAY_ProceduralArg *
getProceduralArgs(const char *)
{
    return theArgs;
}

VRAY_DemoStamp::VRAY_DemoStamp()
{
    myBox.initBounds(0, 0, 0);
}

VRAY_DemoStamp::~VRAY_DemoStamp()
{
}

const char *
VRAY_DemoStamp::getClassName()
{
    return "VRAY_DemoStamp";
}

int
VRAY_DemoStamp::initialize(const UT_BoundingBox *)
{
    fpreal      val[3];

    // Evaluate parameters and store the information
    val[0] = val[1] = val[2] = -1;
    import("minbound", val, 3);
    myBox.initBounds(val[0], val[1], val[2]);

    val[0] = val[1] = val[2] = 1;
    import("maxbound", val, 3);
    myBox.enlargeBounds(val[0], val[1], val[2]);

    if (!import("size", &mySize, 1))
        mySize = 0.1;
    if (!import("npoints", &myCount, 1))
        myCount = 10;
    if (!import("seed", &mySeed, 1))
        mySeed = 1;

    mySize = SYSabs(mySize);

    return 1;
}

void
VRAY_DemoStamp::getBoundingBox(UT_BoundingBox &box)
{
    // Initialize with the bounding box of the stamp procedural
    box = myBox;

    // Each child box can also enlarge the bounds by the size of the child
    box.enlargeBounds(0, mySize);
}

void
VRAY_DemoStamp::render()
{
    int                 i;
    UT_Vector3          c;
    unsigned int        seed;
    float               cx, cy, cz;

    seed = mySeed;
    for (i = 0; i < myCount; i++)
    {
        // Compute random numbers deterministically.  If they were computed in
        // the assign operation, compilers could compute them in a different
        // order.
        cx = SYSfastRandom(seed);
        cy = SYSfastRandom(seed);
        cz = SYSfastRandom(seed);
        c.assign( SYSfit(cx, 0, 1, myBox.xmin(), myBox.xmax()),
                  SYSfit(cy, 0, 1, myBox.ymin(), myBox.ymax()),
                  SYSfit(cz, 0, 1, myBox.zmin(), myBox.zmax()) );

        // Create a new procedural object
        openProceduralObject();
            // We create the procedural ourselves.
            // Alternatively, it's also possible to create a procedural by
            // passing arguments.  This would allow the user to control which
            // procedural gets built.
            addProcedural( new vray_ChildBox(c, mySize) );
        closeObject();
    }
}

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