rtcInvoke...mGeometry(3)

rtcInvoke...mGeometry(3) 💖

ok so bestie, we're deep in the Embree Ray Tracing Kernels 4 lore today and this one is a lil baddie called rtcInvokeIntersectFilterFromGeometry. she's serving utility, she's serving behind-the-scenes, and she's literally the way you ping your geometry's filter from the inside. let's get into it 🎀

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✨ NAME ✨

rtcInvokeIntersectFilterFromGeometry — invokes the intersection filter function from the geometry 🦋

no cap, that's the whole vibe: you're calling the geometry's filter, from the geometry. it's giving self-referential queen.

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✨ SYNOPSIS ✨

#include <embree4/rtcore.h>

void rtcInvokeIntersectFilterFromGeometry(
  const struct RTCIntersectFunctionNArguments* args,
  const struct RTCFilterFunctionNArguments* filterArgs
);

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✨ DESCRIPTION ✨

ok so here's the tea, bestie. rtcInvokeIntersectFilterFromGeometry is the function you call inside an RTCIntersectFunctionN user geometry callback function, and its whole job is to invoke the intersection filter that's registered to the geometry. main character energy fr 💅

but listen, you can't just roll up empty-handed. you gotta create an RTCFilterFunctionNArguments structure first (peep rtcSetGeometryIntersectFilterFunction for the deets on that one). and what's in that lil struct, you ask? okay so it basically consists of:

• a valid mask
• a hit packet to filter
• the corresponding ray packet
• the packet size

got it? iconic. now here's the part that actually matters 👑

after the invocation of rtcInvokeIntersectFilterFromGeometry, only rays that are still valid (valid mask set to -1) should update a hit. periodt.

so like, if the mask isn't -1, that ray is not your problem anymore, don't let it touch the hit. the way that this is non-negotiable... 😭

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✨ EXIT STATUS ✨

so for performance reasons (she's fast, she's efficient, she's not doing charity work), this function does not do any error checks. which means: on failure, it will not set any error flags. nada. zero. silence. 💀

so yeah, don't come looking for an error flag that was never gonna show up. she simply did not do that.

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✨ SEE ALSO ✨

• rtcInvokeOccludedFilterFromGeometry
• rtcSetGeometryIntersectFunction

go read those too bestie, they're all in the same friend group 🫶

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and that's a wrap on the rtcInvoke...mGeometry(3) page from Embree Ray Tracing Kernels 4 ✨ thanks for reading my little yap session, you ate that, slay, go filter some intersections responsibly 💖🎀🦋