RAY_DemoMountain.h

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/*
 * 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.
 *
 *----------------------------------------------------------------------------
 * This is a sample mantra procedural to subdivide a triangle as a fractal.
 */

#ifndef __RAY_DemoBox__
#define __RAY_DemoBox__

#include <UT/UT_BoundingBox.h>
#include <RAY/RAY_Procedural.h>

namespace HDK_Sample {

class FractalPoint {
public:
    void        assign(fpreal x, fpreal y, fpreal z, uint s)
                {
                    pos.assign(x, y, z);
                    seed = s;
                }
    UT_Vector3  pos;
    int         seed;
};

class RAY_DemoMountain : public RAY_Procedural {
public:
             RAY_DemoMountain(int splits=1);
            ~RAY_DemoMountain() override;

    const char          *className() const override;
    int                  initialize(const UT_BoundingBox *) override;
    void                 getBoundingBox(UT_BoundingBox &box) override;
    void                 render() override;

    /// Split into 4 new procedurals (each rendering a triangle)
    void                fractalSplit(); 

    /// Render triangle geometry
    void                fractalRender();

private:
    /// Compute bounding box (including displacement or not)
    void                computeBounds(UT_BoundingBox &box,
                                        bool include_displace);
    FractalPoint         myP[3];
    int                  mySplits;
};

}       // End HDK_Sample namespace

#endif