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.TH "RTCRay" "3" "" "" "Embree Ray Tracing Kernels 3"
.hy
.SS NAME
.IP
.nf
\f[C]
RTCRay\ \-\ single\ ray\ structure
\f[]
.fi
.SS SYNOPSIS
.IP
.nf
\f[C]
#include\ <embree3/rtcore_ray.h>

struct\ RTC_ALIGN(16)\ RTCRay
{
\ \ float\ org_x;\ \ \ \ \ \ \ \ //\ x\ coordinate\ of\ ray\ origin
\ \ float\ org_y;\ \ \ \ \ \ \ \ //\ y\ coordinate\ of\ ray\ origin
\ \ float\ org_z;\ \ \ \ \ \ \ \ //\ z\ coordinate\ of\ ray\ origin
\ \ float\ tnear;\ \ \ \ \ \ \ \ //\ start\ of\ ray\ segment

\ \ float\ dir_x;\ \ \ \ \ \ \ \ //\ x\ coordinate\ of\ ray\ direction
\ \ float\ dir_y;\ \ \ \ \ \ \ \ //\ y\ coordinate\ of\ ray\ direction
\ \ float\ dir_z;\ \ \ \ \ \ \ \ //\ z\ coordinate\ of\ ray\ direction
\ \ float\ time;\ \ \ \ \ \ \ \ \ //\ time\ of\ this\ ray\ for\ motion\ blur

\ \ float\ tfar;\ \ \ \ \ \ \ \ \ //\ end\ of\ ray\ segment\ (set\ to\ hit\ distance)
\ \ unsigned\ int\ mask;\ \ //\ ray\ mask
\ \ unsigned\ int\ id;\ \ \ \ //\ ray\ ID
\ \ unsigned\ int\ flags;\ //\ ray\ flags
};
\f[]
.fi
.SS DESCRIPTION
.PP
The \f[C]RTCRay\f[] structure defines the ray layout for a single ray.
The ray contains the origin (\f[C]org_x\f[], \f[C]org_y\f[],
\f[C]org_z\f[] members), direction vector (\f[C]dir_x\f[],
\f[C]dir_y\f[], \f[C]dir_z\f[] members), and ray segment (\f[C]tnear\f[]
and \f[C]tfar\f[] members).
The ray direction does not have to be normalized, and only the parameter
range specified by the \f[C]tnear\f[]/\f[C]tfar\f[] interval is
considered valid.
.PP
The ray segment must be in the range [0, ∞], thus ranges that start
behind the ray origin are not allowed, but ranges can reach to infinity.
For rays inside a ray stream, \f[C]tfar\f[] < \f[C]tnear\f[] identifies
an inactive ray.
.PP
The ray further contains a motion blur time in the range [0, 1]
(\f[C]time\f[] member), a ray mask (\f[C]mask\f[] member), a ray ID
(\f[C]id\f[] member), and ray flags (\f[C]flags\f[] member).
The ray mask can be used to mask out some geometries for some rays (see
\f[C]rtcSetGeometryMask\f[] for more details).
The ray ID can be used to identify a ray inside a callback function,
even if the order of rays inside a ray packet or stream has changed.
The ray flags are reserved.
.PP
The \f[C]embree3/rtcore_ray.h\f[] header additionally defines the same
ray structure in structure of array (SOA) layout for API functions
accepting ray packets of size 4 (\f[C]RTCRay4\f[] type), size 8
(\f[C]RTCRay8\f[] type), and size 16 (\f[C]RTCRay16\f[] type).
The header additionally defines an \f[C]RTCRayNt\f[] template for ray
packets of an arbitrary compile\-time size.
.SS EXIT STATUS
.SS SEE ALSO
.PP
[RTCHit]