rtcAttachGeometryByID(3)

💅 rtcAttachGeometryByID(3) — like, the Embree Ray Tracing Kernels 4 era 🦋

okay bestie, gather round, because this one is a little function with a big job. it's called rtcAttachGeometryByID, and it lives in the Embree Ray Tracing Kernels (version 4, if we're being precise, and we always are ✨).

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✨ NAME ✨

rtcAttachGeometryByID</p> — attaches a geometry to the scene using a geometry ID that you picked out yourself. no cap. 👑

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🌸 SYNOPSIS 🌸

#include <embree4/rtcore.h>

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

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🎀 DESCRIPTION 🎀

so the way this works is: rtcAttachGeometryByID takes a geometry (that's the geometry argument, duh 💖) and attaches it to a scene (the scene argument, iconic) — and then it slaps your geometry ID (the geomID argument, the moment of truth) onto that geometry. it's giving custom label, hand-picked by you.

every geometry that gets attached to a scene is defined to be included inside that scene. and here's the fun part: one geometry can get attached to multiple scenes. it's polyamorous like that 🫶.

that user-defined geometry ID you passed in? that's what's used to identify the geometry when a ray hits it during ray queries. so basically, this function lets you share the same IDs between your application and Embree to refer to geometries. mutual understanding. communication. slay. 💅

this function is thread-safe, so multiple threads can attach geometries to a scene in parallel. no drama, no fighting. 🌈

⚠️ important bestie moment: the user-provided geometry ID must be unused in the scene, otherwise the creation of the geometry will fail. periodt. 💀

also, keep those geometry IDs compact, okay? because Embree internally creates a vector whose size is equal to the largest geometry ID used. so if you go making very large geometry IDs for small scenes, you're gonna cause memory consumption and performance overhead. it's giving "why are you like this". 😭

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🦋 EXIT STATUS 🦋

on failure, an error code is set — and you can go query it with rtcGetDeviceError. go check on it, it's waiting for you. 🙈

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⭐ SEE ALSO ⭐

• [rtcAttachGeometry]

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and that's the whole page, babe. written for Embree Ray Tracing Kernels 4, rtcAttachGeometryByID(3) — no date on this one, just vibes and a version number. mwah 💜✨