Projection Mapping & Warp/Blend

Exaplay 3 integrates with VIOSO for professional geometric warping and edge blending across multiple projectors.

What Is Warp/Blend?

When multiple projectors cover the same surface (a curved screen, a building facade, or a multi-projector flat screen), two corrections are needed:

• Geometric warping — corrects lens distortion and keystoning so the image aligns with the physical surface.
• Edge blending — fades the overlapping region between adjacent projectors so the join is invisible.

VIOSO handles both using a calibration file (.vwf) produced by its auto-calibration software.

Loading a Calibration File

1. Open Config → Outputs.
2. Select the output you want to warp.
3. Click Load Warp File and choose the .vwf file produced by VIOSO Calibrator.
4. The warp is applied immediately; toggle it on/off with the Warp Enable switch.

Manual Warp Editor

For simple single-projector corrections without VIOSO Calibrator, Exaplay 3 includes a built-in grid warp editor.

Open it from Config → Outputs → Edit Warp.

Control Points

The editor shows a grid of control points overlaid on the output. Each point can be moved to correct the geometry at that location.

Action	How
Select point	Click the point
Move point (fine)	Arrow keys (0.01 unit steps)
Move point (coarse)	Shift + Arrow keys (0.1 unit steps)
Cycle points	Tab / Shift+Tab
Deselect	Escape or Enter
Reset all	Click the Reset button

Interpolation Mode

Choose between Linear and Bicubic interpolation from the Interpolation drop-down. Bicubic produces smoother results but requires more GPU.

Edge Blending

Edge blending parameters are loaded from the VIOSO .vwf file. If you need to manually adjust the blend curve:

1. Open Config → Outputs → Edge Blend.
2. Adjust the Blend Width slider for each overlapping edge (0–100 %).
3. Adjust the Gamma Curve to control the blend falloff shape.

Auto-Calibration (VIOSO)

If VIOSO AutoAlign is installed and a calibration camera is connected:

1. Go to the Auto Calibration view (/autocalibration).
2. Follow the on-screen wizard.
3. The resulting .vwf file is saved and loaded automatically.

Standalone Warp Widget

For quick on-site adjustments without opening the full editor, use the Standalone Warp Widget (/warpblend). This minimal view is optimised for touch-screen control on a tablet.