Distorting the Output with the Warping module

The Warping module is a feature of the Output Setup. It is there to let you distort an output to adjust it precisely on your projection surface.

To use the warping feature, your output needs to be in "Setup" mode (the more advanced one, accessible fromor Output → Setup...).

There are two warping types: Perspective and Linear and both can be combined.

Perspective warping mode

Perspective warping allows you to adjust the corner of a screen to skew its rendering in the output. For instance it can be used to correct the shape of the output and make it rectangular if your projector is not perpendicular to the projection surface (like a keystone correction).

1. Select a screen.
2. On the right, select "Perspective" for the Warping type (it's the default one).
3. Select a corner of the screen in the Screens setup area.
4. Move this corner either with your mouse pointer, the arrow keys (to move precisely pixel by pixel) or by changing its coordinates in the Warping section.

As shown in the screenshot of the output destination just above, the rendering is distorted to correspond to the deformations you have applied to the Screen in the Output Setup.

Note: the warping distortion only affects the output rendering, it is not reflected on the Canvas in the work area or in the output setup window.

Linear warping mode

Linear warping allows you to distort only an area of the output, for instance to compensate for asperities on the projection surface.

1. Select a screen.
2. On the right, select "Linear" for the Warping type.
3. Adjust the number of Subdivisions if needed (from 3 to 15 on each axis).
4. Select a point on the warping grid of the screen in the Screens setup area.
5. Move this corner either with your mouse pointer or with the arrow keys (to move precisely pixel by pixel).

As shown in the screenshot of the output destination just above, the rendering is distorted to correspond to the deformations you have applied to the Screen in the Output Setup.

Note: the warping distortion only affects the output rendering, it is not reflected on the Canvas in the work area or in the output setup window.

Combining Perspective and Linear warping

When you toggle from one type to the other, it doesn't reset the deformations you have made, so both types of warping can actually be used in combination.

Note: if you use the reset button in one mode ("Reset corners" for Perspective and "Reset points" for Linear), it only resets the deformations made for this particular type of warping.