rtcAttachGeometryByID(3)

💖 rtcAttachGeometryByID(3) — Embree Ray Tracing Kernels 3 💖

okay bestie, buckle up, because this one is literally the ✨named✨ version of attaching a geometry to a scene. it lives in embree3/rtcore.h (the Embree Ray Tracing Kernels 3 situation), and it's giving "I want MY ids, thank you very much" energy. 💅

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🌸 NAME 🌸

rtcAttachGeometryByID — attaches a geometry to the scene using a specified geometry ID

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🎀 SYNOPSIS 🎀

#include <embree3/rtcore.h>

void rtcAttachGeometryByID(
  RTCScene scene,
  RTCGeometry geometry,
  unsigned int geomID
);

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🦋 DESCRIPTION 🦋

so the rtcAttachGeometryByID function attaches a geometry (that's the geometry argument, bestie) to a scene (yep, the scene argument) and assigns a user provided geometry ID (the geomID argument) to that geometry. you're not just letting Embree pick — you're picking. main character behavior, honestly. 👑

every geometry you attach to a scene is defined to be included inside the scene. and here's the cute part: a geometry can get attached to multiple scenes. she's polyamorous, she contains multitudes. 🌈

the passed user-defined geometry ID is what's used to identify the geometry when it gets hit by a ray during ray queries. so using this function, it's possible to share the same IDs to refer to geometries inside the application and inside Embree. one id, two worlds, no chaos. iykyk. 💜

thread-safety check: this function is thread-safe, so multiple threads can attach geometries to a scene in parallel. yes bestie, go parallel, she can handle it. ✨

the rules though, fr fr: the user-provided geometry ID must be unused in the scene, otherwise the creation of the geometry will fail. no duplicates, no sharing, no takebacks. 🚫

also, the user-provided geometry IDs should be compact, because Embree internally creates a vector whose size is equal to the largest geometry ID used. so if you create very large geometry IDs for small scenes, that would cause a memory consumption and performance overhead. like… girl why are you allocating id 4,000,000 for three triangles 😭 keep it tight, keep it cute, keep it compact. 🍓

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💀 EXIT STATUS 💀

on failure an error code is set that can be queried using rtcGetDeviceError. so if something went sideways, that's where the receipts are. check it, always. 🙈

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👑 SEE ALSO 👑

• [rtcAttachGeometry]

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and that's the whole vibe, bestie 💖 this page came to you straight from the Embree Ray Tracing Kernels 3 manual set, signed off as rtcAttachGeometryByID(3). go attach something iconic. 🎀✨🦋