struct Params
{
    uchar4*                image;
    unsigned int           image_width;
    unsigned int           image_height;
    float3                 cam_eye;
    float3                 cam_u, cam_v, cam_w;
    OptixTraversableHandle handle;
};

struct TriangleMeshSBTData {
    //vec3f  color;
    float3 *vertex;
    int3   *index;
    float3  color;
};

struct RayGenData
{
    // No data needed
};


struct MissData
{
    float3 bg_color;
};


//struct HitGroupData
//{
//    // No data needed
//};

/*! SBT record for a hitgroup program */
//struct __align__(OPTIX_SBT_RECORD_ALIGNMENT) HitgroupRecord
//{
//    __align__(OPTIX_SBT_RECORD_ALIGNMENT) char header[OPTIX_SBT_RECORD_HEADER_SIZE];
//    TriangleMeshSBTData data;
//};