---
name: "rtcUpdateGeometryBuffer"
section: "3embree4"
platform: "linux"
package: "embree"
version: "4.4.1-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/rtcUpdateGeometryBuffer/3embree4"
---

# rtcUpdateGeometryBuffer(3embree4)

### NAME

-

  ```
  rtcUpdateGeometryBuffer - marks a buffer view bound to the geometry
    as modified
  ```

### SYNOPSIS

-

  ```
  #include <embree4/rtcore.h>
  void rtcUpdateGeometryBuffer(
    RTCGeometry geometry,
    enum RTCBufferType type,
    unsigned int slot
  );
  ```

### DESCRIPTION

The `rtcUpdateGeometryBuffer` function marks the buffer view bound to the specified buffer type and slot (`type` and `slot` argument) of a geometry (`geometry` argument) as modified.

If a data buffer is changed by the application, the `rtcUpdateGeometryBuffer` call must be invoked for that buffer. Each buffer view assigned to a buffer slot is initially marked as modified, thus this function needs to be called only when doing buffer modifications after the first `rtcCommitScene`.

### EXIT STATUS

On failure an error code is set that can be queried using `rtcGetDeviceError`.

### SEE ALSO

\[rtcNewGeometry\], \[rtcCommitScene\]