RTCSETGEOMETRYSUBDIVISIONMODE(3)

💅 rtcSetGeometrySubdivisionMode — from the Embree Ray Tracing Kernels 4 era, bestie

okay so real talk, this is a page from the Embree Ray Tracing Kernels 4 manual and it's about one very specific little function that controls how your subdivision geometry behaves at the edges. sit with me, we're gonna get through this together 🫶

---

✨ NAME ✨

rtcSetGeometrySubdivisionMode — sets the subdivision mode of a subdivision geometry 🌸

---

✨ SYNOPSIS ✨

#include <embree4/rtcore.h>

void rtcSetGeometrySubdivisionMode(
  RTCGeometry geometry,
  unsigned int topologyID,
  enum RTCSubdivisionMode mode
);

---

✨ DESCRIPTION ✨

So the rtcSetGeometrySubdivisionMode function does exactly one job and it does it iconically: it sets the subdivision mode (that's the mode parameter, bestie) for the topology (that's the topologyID parameter) of the subdivision geometry you're pointing at (that's the geometry parameter). three params, one purpose, no drama 💅

And what are these subdivision modes for, you ask? They let you force linear interpolation for certain parts of the subdivision mesh. it's giving "control freak but make it geometry" and honestly? valid. here are the options, no cap:

• RTC_SUBDIVISION_MODE_NO_BOUNDARY — Boundary patches get straight up ignored. This way every rendered patch has a full set of control vertices. bye bye edges ✨
• RTC_SUBDIVISION_MODE_SMOOTH_BOUNDARY — The sequence of boundary control points is used to generate a smooth B-spline boundary curve. this is the default mode, so if you didn't pick anything, congrats, you already picked this 🎀
• RTC_SUBDIVISION_MODE_PIN_CORNERS — Corner vertices get pinned to their location during subdivision. stay put, girl 💜
• RTC_SUBDIVISION_MODE_PIN_BOUNDARY — All vertices at the border get pinned to their location during subdivision. This way the boundary is interpolated linearly. This mode is typically used for texturing, so you can also map texels at the border of the texture to the mesh. lowkey the texture girlie's fave 🌸
• RTC_SUBDIVISION_MODE_PIN_ALL — All vertices at the border get pinned to their location during subdivision. This way all patches are linearly interpolated. everything. pinned. periodt 👑

---

✨ EXIT STATUS ✨

If it goes wrong (and sometimes it does, we've all been there 😭), an error code gets set, and you can go query it with rtcGetDeviceError. that's your vibe check, bestie.

---

✨ SEE ALSO ✨

• [RTC_GEOMETRY_TYPE_SUBDIVISION]

---

ok that's literally the whole page, you ate that 🍓

mwah 💖 that was the rtcSetGeometrySubdivisionMode page from the Embree Ray Tracing Kernels 4 manual, and yeah the footer was just the function name doing a little encore — so consider this your cute sign-off. go forth and subdivide responsibly, bestie 🦋✨