NAME

rtcInitPointQueryContext - initializes the context information (e.g.
  stack of (multilevel-)instance transformations) for point queries

    

SYNOPSIS

#include <embree3/rtcore.h>
struct RTC_ALIGN(16) RTCPointQueryContext
{
  // accumulated 4x4 column major matrices from world to instance space.
  float world2inst[RTC_MAX_INSTANCE_LEVEL_COUNT][16];
  
  // accumulated 4x4 column major matrices from instance to world space.
  float inst2world[RTC_MAX_INSTANCE_LEVEL_COUNT][16];
  // instance ids.
  unsigned int instID[RTC_MAX_INSTANCE_LEVEL_COUNT];
  
  // number of instances currently on the stack.
  unsigned int instStackSize;
};
void rtcInitPointQueryContext(
  struct RTCPointQueryContext* context
);

    

DESCRIPTION

The rtcInitPointContext function initializes the context to default values and should be called for initialization.

The context will be passed as an argument to the point query callback function (see [rtcSetGeometryPointQueryFunction]) and should be used to pass instance information down the instancing chain for user defined instancing (see tutorial [ClosestPoint] for a reference implementation of point queries with user defined instancing).

The context is an necessary argument to [rtcPointQuery] and Embree internally uses the topmost instance tranformation of the stack to transform the point query into instance space.

EXIT STATUS

SEE ALSO