RTCCurveFlags(3)

💅 RTCCurveFlags — per segment flags for curve geometry

okay bestie, so this is RTCCurveFlags(3), a page from the Embree Ray Tracing Kernels 4 docs. it's not a program, it's a lil enum, so no cap it's just vibes and bit flags. let's get into it 🎀

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✨ SYNOPSIS ✨

first things first, you gotta pull in the header:

#include <embree4/rtcore.h>

and here's the whole enum, iconic, two members, that's it:

enum RTCCurveFlags
{
  RTC_CURVE_FLAG_NEIGHBOR_LEFT  = (1 << 0),
  RTC_CURVE_FLAG_NEIGHBOR_RIGHT = (1 << 1)
};

look at her. tiny. perfect. 💖

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🌸 DESCRIPTION 🌸

so the RTCCurveFlags type is what you use for linear curves to say whether the left neighbor segment and/or the right neighbor segment actually exist. the way you do that is you attach a buffer of type RTC_BUFFER_TYPE_FLAGS to the curve geometry, and that buffer stores an individual byte per curve segment. one byte, one segment, no notes. 💅

now, the tea on those flags:

• if the RTC_CURVE_FLAG_NEIGHBOR_LEFT flag is enabled in that byte for a curve segment, that means the left segment exists — and fr, the left segment is the one that starts one vertex before the start vertex of the current curve. and when it's enabled, the current segment gets rendered so it properly attaches to that segment. slay, continuity. 🦋
• if the RTC_CURVE_FLAG_NEIGHBOR_RIGHT flag is enabled in that byte for a curve segment, that means the right segment exists — which is the one that ends one vertex after the end vertex of the current curve. and again, the current segment gets rendered to properly attach to that segment. periodt. ✨

⚠️ okay listen, this one matters: if you do not properly specify the left and right flags for linear curves, the rendering at the ending of these curves may not look correct. in particular when round linear curves are viewed from the inside. so like… specify your flags, bestie, don't let it look janky 😭

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👑 EXIT STATUS 👑

lowkey nothing here — it's an enum, not a program, so there's no exit status to report. she simply doesn't have one. 💀 (the original page leaves this section empty and we're honoring that.)

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🌈 SEE ALSO 🌈

• [RTC_GEOMETRY_TYPE_CURVE]

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🫶 and that's the whole page! this cutie lives in the Embree Ray Tracing Kernels 4 manual, filed under RTCCurveFlags(3). go forth and flag your curve segments correctly, mwah 💜