Enums

class fvdb.CameraModel(*values)

Camera model for projection / ray generation.

Notes:

• PINHOLE and ORTHOGRAPHIC ignore distortion coefficients.

• OPENCV_* variants use pinhole intrinsics plus OpenCV-style distortion. When distortion coefficients are provided, FVDB expects a packed layout:

  [k1,k2,k3,k4,k5,k6,p1,p2,s1,s2,s3,s4]

  Unused coefficients for a given model should be set to 0.

OPENCV_RADTAN_5 = 1

OpenCV radial-tangential distortion with 5 parameters (k1,k2,p1,p2,k3).

OPENCV_RADTAN_THIN_PRISM_9 = 3

OpenCV radial-tangential + thin-prism distortion with 9 parameters (k1,k2,p1,p2,k3,s1..s4).

OPENCV_RATIONAL_8 = 2

OpenCV rational radial-tangential distortion with 8 parameters (k1..k6,p1,p2).

OPENCV_THIN_PRISM_12 = 4

OpenCV rational radial-tangential + thin-prism distortion with 12 parameters (k1..k6,p1,p2,s1..s4).

ORTHOGRAPHIC = 5

Orthographic camera model (no distortion).

PINHOLE = 0

Ideal pinhole camera model (no distortion).

class fvdb.ProjectionMethod(*values)

Projection implementation selector for Gaussian splatting camera models.

ANALYTIC = 1

Use the analytic projection path.

AUTO = 0

Choose the default implementation for the selected camera model.

UNSCENTED = 2

Use the unscented projection path.

class fvdb.RollingShutterType(*values)

Rolling shutter policy for camera projection / ray generation.

Rolling shutter models treat different image rows/columns as having different exposure times. FVDB uses this to interpolate between per-camera start/end poses when generating rays.

HORIZONTAL = 2

exposure time varies with image column (x).

Type:

Horizontal rolling shutter

NONE = 0

the start pose is used for all pixels.

Type:

No rolling shutter

VERTICAL = 1

exposure time varies with image row (y).

Type:

Vertical rolling shutter

class fvdb.ShOrderingMode(*values)

Enum representing spherical harmonics ordering modes used by Gaussian Splats.. Spherical harmonics for Gaussian splatting can be stored differently in memory depending on the application. For example, PLY files store spherical harmonics in RRR_GGG_BBB order, while some rendering codes (including fvdb.GaussianSplat3d) use RGB_RGB_RGB order.

This enum defines two common ordering modes:

• RGB_RGB_RGB: The feature channels are interleaved for each coefficient. i.e. The spherical harmonics tensor corresponds to a (row-major) contiguous tensor of shape [num_coefficients, num_sh_bases, channels], where channels=3 for RGB.

• RRR_GGG_BBB: The feature channels are stored in separate blocks for each coefficient. i.e. The spherical harmonics tensor corresponds to a (row-major) contiguous tensor of shape [num_coefficients, channels, num_sh_bases], where channels=3 for RGB.

RGB_RGB_RGB = 'rgb_rgb_rgb'

The feature channels of spherical harmonics are interleaved for each coefficient. i.e. The spherical harmonics tensor corresponds to a (row-major) contiguous tensor of shape [num_coefficients, num_sh_bases, channels], where channels=3 for RGB.

RRR_GGG_BBB = 'rrr_ggg_bbb'

The feature channels of spherical harmonics are stored in separate blocks for each coefficient. i.e. The spherical harmonics tensor corresponds to a (row-major) contiguous tensor of shape [num_coefficients, channels, num_sh_bases], where channels=3 for RGB.