RTCGETGEOMETRYTRANSFORM(3embree3)

💖 rtcGetGeometryTransform — the girlies' guide to Embree Ray Tracing Kernels 3 💖

okay bestie, come sit with me, we're doing rtcGetGeometryTransform from Embree Ray Tracing Kernels 3 and honestly? she's a baddie. ✨

🌸 NAME 🌸

rtcGetGeometryTransform</pura> — she hands you back the interpolated instance transformation for the exact time you asked for. no cap. 🕐💅

✨ SYNOPSIS ✨

#include <embree3/rtcore.h>

void rtcGetGeometryTransform(
  RTCGeometry geometry,
  float time,
  enum RTCFormat format,
  void* xfm
);

🦋 DESCRIPTION 🦋

so like. the rtcGetGeometryTransform function returns the interpolated local to world transformation — that's your xfm parameter, mwah 😘 — of an instance geometry (that's the geometry parameter) for one particular time (and yes, time lives in the range [0, 1], respect her bounds), in whatever format you asked for (format parameter, obviously 💁‍♀️).

the formats your returned matrix can be in, bestie, let me list them because they are not interchangeable and the vibes differ:

• RTC_FORMAT_FLOAT3X4_ROW_MAJOR — the 3×4 float matrix is laid out in row-major form. slay, she's tidy, she reads left to right like a good little group chat. 📖✨
• RTC_FORMAT_FLOAT3X4_COLUMN_MAJOR — the 3×4 float matrix is laid out in column-major form. different girl, different walk. 💃
• RTC_FORMAT_FLOAT4X4_COLUMN_MAJOR — the 3×4 float matrix is laid out in column-major form as a 4×4 homogeneous matrix, with the last row equal to (0, 0, 0, 1). she's giving ✨main character✨ energy, all glowed up into 4×4. 👑

🎀 lowkey important: pick your format on purpose. the bytes literally land in a different order depending on which one you pass, and your math will simply not eat if you guess wrong. no cap.

💀 EXIT STATUS 💀

if it goes wrong — and bestie, sometimes it does — an error code is set that you can go query with rtcGetDeviceError. that's your receipts, keep them. 🧾😭

👀 SEE ALSO 👀

• [RTC_GEOMETRY_TYPE_INSTANCE]
• [rtcSetGeometryTransform]

iykyk — one of those sets it, this one gets it. the cycle of life. 🌈🦋

and that's the whole page, periodt. 💅 this was rtcGetGeometryTransform(3) from the Embree Ray Tracing Kernels 3 manual — same source, same version, same girl, just with way better energy now. go transform something, bestie, you got this 🫶✨🌸