RTCGETGEOMETRYUSERDATA(3)

💖 rtcGetGeometryUserData — bestie, where'd your pointer go?? 💖

okay so this is a page from the Embree Ray Tracing Kernels 4 manual, and it's literally about getting your lil user data pointer back out of a geometry. tiny function, huge main character energy. let's get into it 🫶

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✨ NAME ✨

rtcGetGeometryUserData — returns the user data pointer of the geometry 🌸

like. that's it. that's the whole job. it hands you back the pointer you stashed earlier. obsessed.

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🎀 SYNOPSIS 🎀

#include <embree4/rtcore.h>

void* rtcGetGeometryUserData(RTCGeometry geometry);

look at her. one argument. returns a void*. no drama, no cap 💅

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🦋 DESCRIPTION 🦋

okay so the rtcGetGeometryUserData function queries the user data pointer that you previously set with rtcSetGeometryUserData. that's the whole vibe — you put it in, this gets it out. iconique.

and if rtcSetGeometryUserData was not called yet? you get NULL back. not a crash, not a mystery, just NULL. she's honest like that 😌

now here's the part you actually need to know, bestie, because it's giving important caveat:

This function is supposed to be used during rendering, but it's only supported on the CPU and not inside SYCL kernels on the GPU. Inside a SYCL kernel you have to use rtcGetGeometryUserDataFromScene instead. fr fr. don't skip this part, i'm begging 🙈

so: CPU rendering = yes, this function. SYCL kernel on the GPU = nope, use the FromScene one. different function, different vibe check. don't mix them up 💀

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💜 EXIT STATUS 💜

if something goes wrong, an error code gets set — and you can go ask about it using rtcGetDeviceError. so if this returns something sus, that's where you look 👑

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🌈 SEE ALSO 🌈

• rtcSetGeometryUserData — the one that puts the pointer in
• rtcGetGeometryUserDataFromScene — the one you need inside SYCL kernels

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and that's the page, bestie!! short, sweet, and absolutely ate. go get your pointers. you got this 🧚💖

~ with love, from the Embree Ray Tracing Kernels 4 manual, rtcGetGeometryUserData(3) ~ ✨🎀