GU_IsoMeta.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        GU_IsoMeta.h ( GU Library, C++)
 *
 * COMMENTS:    Fast meta-ball polygonization.
 *
 * CAVEATS:     The conversion can only happen once (i.e. it's not possible to
 *              convert multiple times since the data queue gets used up and
 *              needs to be re-initialized.
 */

#ifndef __GU_IsoMeta__
#define __GU_IsoMeta__

#include "GU_API.h"
#include "GU_Iso.h"
#include <GA/GA_AttributeRefMap.h>
#include <GA/GA_Handle.h>
#include <TS/TS_Expression.h>
#include <UT/UT_BoundingBox.h>
#include <UT/UT_IntArray.h>

class GA_PrimitiveGroup;
class GEO_Primitive;
class GEO_MetaPrim;
class TS_MetaExpression;
class GEO_MetaExpression;

class GU_API GU_IsoMeta : public GU_IsoSurface
{
public:
             GU_IsoMeta(GU_Detail *dest, const GU_Detail *src,
                        const GA_PrimitiveGroup *grp = NULL);
             GU_IsoMeta(GU_Detail *dest, const GU_Detail *src,
                        const GEO_MetaExpression *expr);
            ~GU_IsoMeta() override;

    const UT_BoundingBox        &getBounds() const { return myBox; }

    float               evalEdge(const UT_Vector3 &pt) override;
    bool                hasGradient() const override    { return true; }
    UT_Vector3          evalGrad(const UT_Vector3 &pt) override;

private:
    void                fillPointVertexAttributes(
                                GU_Detail &detail,
                                GA_Offset vtxoff) override;
    void                fillPrimitiveAttributes(
                                GEO_Primitive *primitive) override;

private:
    void                 construct(GU_Detail *dest, const GU_Detail *src,
                                   const TS_MetaExpressionPtr &expr);

private:
    GA_AttributeRefMap  myVertexHandles;
    GA_AttributeRefMap  myPrimitiveHandles;
    GA_RWHandleV3       myN;
    TS_MetaExpressionPtr myExpr;
    UT_BoundingBox      myBox;
};

#endif