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

# rtcInterpolateN(3embree4)

### NAME

-

  ```
  rtcInterpolateN - performs N interpolations of vertex attribute data
  ```

### SYNOPSIS

-

  ```
  #include <embree4/rtcore.h>
  struct RTCInterpolateNArguments
  {
    RTCGeometry geometry;
    const void* valid;
    const unsigned int* primIDs;
    const float* u;
    const float* v;
    unsigned int N;
    enum RTCBufferType bufferType;
    unsigned int bufferSlot;
    float* P;
    float* dPdu;
    float* dPdv;
    float* ddPdudu;
    float* ddPdvdv;
    float* ddPdudv;
    unsigned int valueCount;
  };
  void rtcInterpolateN(
    const struct RTCInterpolateNArguments* args
  );
  ```

### DESCRIPTION

The `rtcInterpolateN` is similar to `rtcInterpolate`, but performs `N` many interpolations at once. It additionally gets an array of u/v coordinates and a valid mask (`valid` parameter) that specifies which of these coordinates are valid. The valid mask points to `N` integers, and a value of -1 denotes valid and 0 invalid. If the valid pointer is `NULL` all elements are considers valid. The destination arrays are filled in structure of array (SOA) layout. The value `N` must be divisible by 4.

To use `rtcInterpolateN` for a geometry, all changes to that geometry must be properly committed using `rtcCommitGeometry`.

### EXIT STATUS

For performance reasons this function does not do any error checks, thus will not set any error flags on failure.

### SEE ALSO

\[rtcInterpolate\]