Corner Positioner Node

Corner Positioner is Fusion's manual corner pin tool. The 4 corners (Top Left, Top Right, Bottom Left, Bottom Right) can be positioned by hand, animated with keyframes, or driven by 4 separate Trackers to follow a moving screen.

A simpler and more precise approach than the Planar Tracker when you can place the 4 corners by hand or when the animation is simple (locked-off shot, or tracking with 4 clear points).

• Effects Library: Tools > Warp > Corner Positioner
• Quick add: right-click in the Node Editor → Add Tool > Warp > Corner Positioner

Corner Positioner

Manual positioning of the 4 corners. Precise and controllable, but every frame has to be keyframed (unless it is connected to Trackers).

Planar Tracker

Automatic tracking of a flat surface. Analysis + track + corner pin in a single flow. More powerful but less finely controllable.

Planar Transform

Tracking data baked from a Planar Tracker. Used after tracking.

Rule: locked-off shot or 4 identifiable points → Corner Positioner. Flat surface with complex movement → Planar Tracker. Corner Positioner can also be used after a Planar Tracker for fine adjustment.

• Input (orange) - the 2D image to corner pin.
• Effect Mask (blue) - optional. Constrains the warped area.

Static sign replacement:
Image (new sign) → Corner Positioner (4 corners on the source sign)
                         → Merge 2D FG
MediaIn (shot with the old sign) → Merge 2D BG
                                    ↓
                                 MediaOut

Animated sign replacement with 4 Trackers:
Image → Corner Positioner (4 corners animated by 4 Tracker modifiers)
     → Merge

Post-Planar Tracker refinement:
Planar Tracker → Corner Positioner (fine manual adjustment) → Merge

Top Left / Top Right / Bottom Left / Bottom Right (X and Y)

Position of the 4 corners. Crosshairs you can drag in the viewer. Accepts a Tracker modifier for automatic animation (right-click → Modify With → Tracker Position).

Offset X / Y

Fine adjustment. If an attached tracker does not hit exactly the right pixel, the Offset compensates without having to redo the tracking.

Mapping Type

Bi-Linear: simple 2D warping (without a true perspective calculation). Perspective: 3D perspective calculation with 2D mapping. More realistic.

Bi-Linear

Interpolates linearly between the 4 corners. Fast, but the inner texture does not really respect 3D perspective - useful for stylized effects, not for realistic integration.

Perspective

Correctly computes the perspective homography: the image is distorted as if it really sat on a 3D plane seen from that perspective. The choice for realism.

Rule: realistic screen replacement → Perspective. Graphic transition or 2D effect → Bi-Linear.

• Static sign / billboard replacement - place the 4 corners on the target sign in a locked-off shot → the replacement image takes on the perspective.
• Screen replacement with 4 Trackers - attach 4 Tracker modifiers to the 4 corners. Each tracker follows one corner of the source screen → the corner pin follows automatically.
• Post-processing a Planar Tracker - after an imperfect Planar Tracker, a downstream Corner Positioner lets you finely touch up the corners without re-running the track.
• Perspective correction - an image of a document photographed at an angle → Corner Positioner to straighten it into a front view (Perspective mode).
• 2D insertion in a locked-off shot - display a logo or UI on a wall, a table or a shop window in a shot without camera movement.
• Simulated projection mapping - simulate a video projection on a building facade or a flat object in a comp.

• Perspective by default for realism. Bi-Linear is fine for simple or stylized cases.
• 4 separate Trackers for animation - attach each corner to a Tracker modifier (right-click → Modify With → Tracker). The 4 Trackers follow the 4 corners independently.
• Offset for fine correction - if a tracker attached to a corner does not point to exactly the right pixel of the source image, Offset snaps it back without re-tracking.
• Alignment with the source image - the 4 corners must match the 4 corners of what you want to replace, not the overall frame. If the sign in the footage is not truly rectangular (rounded corners, for example), still stretch to the outer edges.
• After a Planar Tracker, not always needed - the Planar Tracker already does the corner pin automatically. Only add a Corner Positioner when a correction is needed.
• Viewer markers for precision - zoom in the viewer to place the corners pixel-perfect on the edges of the target sign.
• For a corner pin on a non-flat surface (curvature, organic warping), Corner Positioner is not enough. Use Grid Warp or a combination of Corner Positioner + Grid Warp.