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rtcInitPointQueryInstanceStack(3) Embree Ray Tracing Kernels 3 rtcInitPointQueryInstanceStack(3)

NAME


rtcInitPointQueryInstanceStack - initializes the stack of (multilevel-)instance
  information for point queries

    

SYNOPSIS


#include <embree3/rtcore.h>
struct RTC_ALIGN(16) RTCPointQueryInstanceStack
{
  // 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 size;
};
void rtcInitPointQueryInstanceStack(
  struct RTCPointQueryInstanceStack* instStack
);

    

DESCRIPTION

A stack (RTCPointQueryInstanceStack type) which stores the IDs and instance transformations during a BVH traversal for a point query.

The rtcInitPointQueryStack function initializes the stack to default values and should be called for initialization.

The stack 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 stack 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

No error code is set by this function.

SEE ALSO

[rtcPointQuery], [rtcSetGeometryPointQueryFunction]