# CornerPin2D

> Warps the image so the from1-4 corners land on to1-4.

Warps the image so the from1-4 corners land on to1-4. Drag the to handles in the Viewer. Use fewer corners (enable1-4) for a simpler move. Extra matrix, invert, filter, motion blur and bounding box work as on Transform, and it joins a Transform chain into one filter. Copy "from" to "to", Copy "to" to "from" and Set "to" to input are buttons.

| Node | CornerPin2D |
|---|---|
| Menu | Transform › CornerPin2D |
| **Names in each format** | |
| .oink comp (JSON) | `"type": "OC_N_cornerpin"` |
| .nk script | `CornerPin2D` ([how .nk import works](/docs/nuke-users/nk-import)) |
| Python | `nuke.createNode("CornerPin2D")` |
| Assistant (MCP) | `create_node(type="CornerPin2D")` |
| Tab search | `cornerpin2d`, or its initials `cp2d` |

![CornerPin2D properties](/shots/nodes/cornerpin@2x.webp)

## Inputs and outputs

| Port | Name | Type |
|---|---|---|
| input 0 | Image | image |
| input 1 | mask | image |
| output 0 | Image | image |

## Knobs

Panel tab **CornerPin2D**, in panel order.

| Knob | Label | Type | Default | Range / values | .nk knob | Description |
|---|---|---|---|---|---|---|
| `channels` | channels | menu | `all` | rgba, rgb, alpha, all, none |  | Layer the op applies to: rgb, rgba, alpha, all, none, <layer> or <layer>.<ch> |
| `to1` | to1 | vector ×2 | `0, 0` | -2000 to 6000 | `to1` |  |
| `enable1` | enable1 | bool | `true` |  | `enable1` |  |
| `to2` | to2 | vector ×2 | `1920, 0` | -2000 to 6000 | `to2` |  |
| `enable2` | enable2 | bool | `true` |  | `enable2` |  |
| `to3` | to3 | vector ×2 | `1920, 1080` | -2000 to 6000 | `to3` |  |
| `enable3` | enable3 | bool | `true` |  | `enable3` |  |
| `to4` | to4 | vector ×2 | `0, 1080` | -2000 to 6000 | `to4` |  |
| `enable4` | enable4 | bool | `true` |  | `enable4` |  |
| `copy_from` | Copy 'from' | button (panel only) |  |  |  |  |
| `transform_matrix` | extra matrix | matrix ×16 | `1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1` |  | `transform_matrix` |  |
| `invert` | invert | bool | `false` |  | `invert` |  |
| `filter` | filter | menu | `CUBIC` | IMPULSE (Impulse), CUBIC (Cubic), KEYS (Keys), SIMON (Simon), RIFMAN (Rifman), MITCHELL (Mitchell), PARZEN (Parzen), NOTCH (Notch), LANCZOS4 (Lanczos4), LANCZOS6 (Lanczos6), SINC4 (Sinc4) | `filter` |  |
| `clamp` | clamp | bool | `false` |  | `clamp` |  |
| `black_outside` | black outside | bool | `true` |  | `black_outside` |  |
| `motionblur` | motionblur | float | `0` | 0 to 4 | `motionblur` |  |
| `shutter` | shutter | float | `0.5` | 0 to 2 | `shutter` |  |
| `shutter_offset` | shutter offset | menu | `START` | CENTRED (centred), START (start), END (end), CUSTOM (custom) | `shutteroffset` |  |
| `shutter_custom_offset` | custom offset | float | `0` | -1 to 1 | `shuttercustomoffset` |  |
| `mask_channel` | mask | menu | `none` | none, rgba.alpha, rgba.red, rgba.green, rgba.blue |  | Mask channel, e.g. rgba.alpha (none = no mask) |
| `inject` | inject | bool | `false` |  |  | Copy the mask into mask.a for nodes downstream |
| `invert_mask` | invert | bool | `false` |  | `invert_mask` |  |
| `fringe` | fringe | bool | `false` |  |  | Only apply the effect at the edges of the mask |
| `mix` | mix | float | `1` | 0 to 1 | `mix` |  |
| `from1` | from1 | vector ×2 | `0, 0` | -2000 to 6000 | `from1` |  |
| `from2` | from2 | vector ×2 | `1920, 0` | -2000 to 6000 | `from2` |  |
| `from3` | from3 | vector ×2 | `1920, 1080` | -2000 to 6000 | `from3` |  |
| `from4` | from4 | vector ×2 | `0, 1080` | -2000 to 6000 | `from4` |  |
| `set_to_input` | Set to input | button (panel only) |  |  |  |  |
| `copy_to` | Copy 'to' | button (panel only) |  |  |  |  |

### Other knobs (Python, .nk and the assistant; not on the panel)

| Knob | Label | Type | Default | Range / values | .nk knob | Description |
|---|---|---|---|---|---|---|
| `gl_color` | Viewer Controls Color | float ×3 | `0, 0, 0` | 0 to 1 |  |  |
| `postage_stamp_frame` | Static Frame | int | `1` | -2147483648 to 2147483647 |  |  |
| `lifetimeStart` | Lifetime Start | int | `0` | -2147483648 to 2147483647 |  |  |
| `lifetimeEnd` | Lifetime End | int | `100` | -2147483648 to 2147483647 |  |  |
| `useLifetime` | Use Lifetime | boolean | `false` |  |  |  |
| `cached` | Cached | boolean | `false` |  |  |  |
| `bookmark` | Bookmark | boolean | `false` |  |  |  |
| `dope_sheet` | Dope Sheet | boolean | `false` |  |  |  |
| `clone_group` | Clone Group | string |  |  |  |  |
| `link_source` | Link Source | string |  |  |  |  |
| `link_overrides` | Link Overrides | string |  |  |  |  |
| `split_views` | Split Views | string |  |  |  |  |
| `unpremult` | (Un)premult by | enum | `none` | none, rgba.alpha |  |  |
| `invert_unpremult` | invert | boolean | `false` |  |  | (Un)premultiply by 1 - alpha |

## Knob names in .nk scripts

| .nk knob | Knob here |
|---|---|
| `shutteroffset` | `shutter_offset` |
| `shuttercustomoffset` | `shutter_custom_offset` |

Other .nk knobs use the same name here. See [.nk import](/docs/nuke-users/nk-import).

## Examples

Open these from **Help › Examples…**, or from the **?** menu in this node's Properties panel.

- **CornerPin a photo onto a plate** (`examples/transform/cornerpin.oink`): CornerPin maps the four corners of the source (from1-4) to four points (to1-4). The pinned photo is merged over another plate, like a screen replacement.
- **Tracker to CornerPin** (`examples/transform/tracker_cornerpin.oink`): Four points tracked on a moving plate, exported as an animated CornerPin that carries a text patch along with the move.


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Sources: opencomp_core/nodes/tracking/cornerpin.py, opencomp_electron/src/components/properties/knobSchema.ts, opencomp_core/nodes/help/cornerpin.md, opencomp_core/nk/mapping.py