SIM/SIM_RayIntersect.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.
 *
 * Produced by:
 *      Side Effects Software Inc.
 *      123 Front Street West, Suite 1401
 *      Toronto, Ontario
 *      Canada   M5J 2M2
 *      416-504-9876
 */

#ifndef __SIM_RayIntersect_h__
#define __SIM_RayIntersect_h__

#include "SIM_API.h"
#include <GU/GU_RayIntersect.h>
#include "SIM_DataUtils.h"

class SIM_Geometry;

/// This class hold a GU_RayIntersect structure. This is a data structure
/// that can be built from any GU_Detail. As such, this data should be
/// used by attaching it as subdata to a SIM_Geometry, and calling
/// createRayIntersect(). Because this data can be recreated on demand,
/// it returns true from the getIsAlternateRepresentationSubclass() function
/// and is never saved to or loaded from disk. It also gets deleted
/// automatically if the parent SIM_Geomtry data changes.
class SIM_API SIM_RayIntersect : public SIM_Data
{
public:
    /// Get the ray intersection structure. Note that the ray intersect
    /// information is always stored for the geometry without applying the
    /// geometry transform. This is unlike the SIM_SDF class, but is
    /// required by the nature of the ray intersection data structure,
    /// which holdson to primitive pointers.
    GU_RayIntersect     &getRayIntersect() const;

protected:
    explicit             SIM_RayIntersect(const SIM_DataFactory *factory);
    virtual             ~SIM_RayIntersect();

    /// Clears the ray intersection data.
    virtual void         initializeSubclass();
    /// Returns the information that this data type is built on demand.
    /// It can be rebuilt at any time from any SIM_Geometry data.
    virtual int64        getMemorySizeSubclass() const;
    virtual bool         getIsAlternateRepresentationSubclass() const;
    virtual void         initAlternateRepresentationSubclass(const SIM_Data &);

private:
    /// Build the ray intersection structure from some geometry.
    void                 createRayIntersect(const SIM_Geometry *geo);

    mutable GU_RayIntersect      myRayIntersect;

    DECLARE_STANDARD_GETCASTTOTYPE();
    DECLARE_DATAFACTORY(SIM_RayIntersect,
                        SIM_Data,
                        "Geometry Ray Intersector",
                        getEmptyDopDescription());
};

#endif

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