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Comparing ray/src/cv/mgflib/mgfdoc.tr (file contents):
Revision 1.18 by greg, Fri Mar 21 12:32:30 1997 UTC vs.
Revision 1.19 by gregl, Thu Oct 16 11:42:25 1997 UTC

# Line 3927 | Line 3927 | typedef FLOAT  FVECT[3];       /* a 3-d real vector */
3927  
3928   typedef struct {
3929          int     clock;                  /* incremented each change -- resettable */
3930 +        char    *client_data;   /* pointer to private client data */
3931          FVECT   p, n;           /* point and normal */
3932   } C_VERTEX;             /* vertex context */
3933   .DE
# Line 3948 | Line 3949 | handler.
3949   (See the
3950   .I xf_handler
3951   page.)\0
3952 + The
3953 + .I client_data
3954 + pointer may be used to index private application data for vertex
3955 + linking, etc.
3956 + This pointer is initialized to NULL when the context is created,
3957 + and otherwise ignored by the parser library.
3958   .LP
3959 < It is possible but not recommended to alter the contents of the
3959 > It is possible but not recommended to alter the shared contents of the
3960   vertex structure returned by
3961   .I c_getvert.
3962   Normally it is read during the
# Line 4070 | Line 4077 | structure, defined in "parser.h" as:
4077  
4078   typedef struct {
4079          int     clock;                  /* incremented each change */
4080 +        char    *client_data;   /* pointer to private client data */
4081          short   flags;                  /* what's been set */
4082          short   ssamp[C_CNSS];  /* spectral samples, min wl to max */
4083          long    ssum;                   /* straight sum of spectral values */
# Line 4085 | Line 4093 | desired.
4093   This is a convenient way to keep track of whether or not a color has
4094   changed since its last use.
4095   The
4096 + .I client_data
4097 + pointer may be used to index private application data.
4098 + This pointer is initialized to NULL when the context is created,
4099 + and otherwise ignored by the parser library.
4100 + The
4101   .I flags
4102   member indicates which color representations have been assigned,
4103   and is an inclusive OR of one or more of the following:
# Line 4229 | Line 4242 | structure, defined in "parser.h" as:
4242  
4243   typedef struct {
4244          int     clock;          /* incremented each change -- resettable */
4245 +        char    *client_data;   /* pointer to private client data */
4246          int     sided;          /* 1 if surface is 1-sided, 0 for 2-sided */
4247          float   nr, ni;         /* index of refraction, real and imaginary */
4248          float   rd;             /* diffuse reflectance */
# Line 4252 | Line 4266 | material field entity, and may be reset by the calling
4266   desired.
4267   This is a convenient way to keep track of whether or not a material has
4268   changed since its last use.
4269 + The
4270 + .I client_data
4271 + pointer may be used to index private application data.
4272 + This pointer is initialized to NULL when the context is created,
4273 + and otherwise ignored by the parser library.
4274   .LP
4275   All reflectance and transmittance values correspond to normal
4276   incidence, and may vary as a function of angle depending on the

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