rtcInterpolateN(3)

💖 rtcInterpolateN 💖

okay bestie, welcome to rtcInterpolateN from the Embree Ray Tracing Kernels 4 manual. she does N interpolations of vertex attribute data at once and honestly? she's serving efficiency. let's get into it ✨

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✨ SYNOPSIS ✨

first the include, no cap:

#include <embree4/rtcore.h>

then the struct that carries all your args, exactly like this:

struct RTCInterpolateNArguments
{
  RTCGeometry geometry;
  const void* valid;
  const unsigned int* primIDs;
  const float* u;
  const float* v;
  unsigned int N;
  enum RTCBufferType bufferType;
  unsigned int bufferSlot;
  float* P;
  float* dPdu;
  float* dPdv;
  float* ddPdudu;
  float* ddPdvdv;
  float* ddPdudv;
  unsigned int valueCount;
};

and the function itself, which takes a pointer to one of those:

void rtcInterpolateN(
  const struct RTCInterpolateNArguments* args
);

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🎀 DESCRIPTION 🎀

so rtcInterpolateN is basically rtcInterpolate's extroverted older sister 💅 — same energy, but she does N many interpolations at once instead of just one. main character behavior fr fr.

on top of everything the single version does, she also takes:

• an array of u/v coordinates 🦋
• a valid mask (the valid parameter) that says which of those coordinates are actually valid 👑

let's talk about that valid mask, because it's giving gatekeeper:

• it points to N integers
• a value of -1 means valid ✅
• a value of 0 means invalid ❌
• if the valid pointer is NULL, then all elements are considered valid — she trusts everyone, cute 🫶

the destination arrays get filled in structure of array (SOA) layout, so keep that in mind when you're reading the results back.

⚠️ and listen: the value N must be divisible by 4. that's not a vibe suggestion, that's a requirement. periodt.

also, to use rtcInterpolateN on a geometry, all changes to that geometry must be properly committed using rtcCommitGeometry first. no committing, no interpolating. that's the rule 🌸

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🚨 EXIT STATUS 🚨

okay this part is a little unhinged but here we go:

for performance reasons, this function does not do any error checks. so if something goes wrong, she will not set any error flags on failure. 💀 she simply will not tell you. check your inputs yourself, bestie, that's on you 😭

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👀 SEE ALSO 👀

• rtcInterpolate — her solo act, go read that one too ✨

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and that's the whole page!! this was rtcInterpolateN(3) from the Embree Ray Tracing Kernels 4 manual set. tysm for reading, go commit your geometry, and slay 💅💖🌈