RTCSETGEOMETRYTRANSFORM(3)

💖 NAME 💖

rtcSetGeometryTransform — sets the transformation for a particular time step of an instance geometry. bestie. it literally puts your instance where you want it to be 🦋

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✨ SYNOPSIS ✨

#include <embree4/rtcore.h>

void rtcSetGeometryTransform(
  RTCGeometry geometry,
  unsigned int timeStep,
  enum RTCFormat format,
  const float* xfm
);

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🌸 DESCRIPTION 🌸

okay so here's the tea, bestie. rtcSetGeometryTransform sets the local-to-world affine transformation (that's the xfm parameter, the main character here 👑) of an instance geometry (the geometry parameter) for a particular time step (the timeStep parameter). yes, a specific time step, because motion blur exists and she is booked and busy 💅

the transformation gets specified as a 3×4 matrix — and when we say 3×4 we mean a 3×3 linear transformation plus translation, no cap. the formats you can hand over via the format parameter are these iconic ones:

• RTC_FORMAT_FLOAT3X4_ROW_MAJOR — the 3×4 float matrix is laid out in row-major form. slay, rows first 🌈
• RTC_FORMAT_FLOAT3X4_COLUMN_MAJOR — the 3×4 float matrix is laid out in column-major form. columns first, periodt ✨
• 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 being equal to (0, 0, 0, 1). it's giving extra row for free 🎀

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💀 EXIT STATUS 💀

on failure, an error code gets set, and you can go query it with rtcGetDeviceError. not me being dramatic about it but fr fr, always check 😭

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🫶 SEE ALSO 🫶

• [RTC_GEOMETRY_TYPE_INSTANCE]

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and that's the whole vibe, bestie 💜 this was page rtcSetGeo...yTransform(3) from Embree Ray Tracing Kernels 4 — go set some transforms, you absolute icon 🌟🍓