CHAPTER 12

Global Functions: Collage Generator™ Effect

11.Use Modifier 3 to adjust the vertical size of the output, stretching and compressing it to adjust for the size of the sphere, keeping the vertical size of the grid filling the output without clipping the image.

Correct for the flat to round surface distortions

12.On the Graphic Effect Mode channel set to Spherical Control 2 (DMX = 254), use the associated Modifier 3 to compress the grid edges adjusting the bend in horizontal grid lines. This adjustment should not be used to fill the projector output horizontally. Instead, it should be used in conjunction with the Spherical Mapping Global Effect Modifier 1 to control the longitude angle of the projected image. Global Effect Modifier 1 should be maintained close to the theoretical longitude angle.

13.Use Modifier 1 and Modifier 2 to adjust the amount of bend, up or down, in the horizontal lines of the grid. Modifier 1 controls amount of correction. Modifier 2 controls where the center of correction occurs.

14.If the spherical mapping effect is being used in conjunction with the Collage Generator effect, select the Enhanced Collage Generator option (DMX = 141) in the other Global Effect channel now. Set the appropriate grid size and grid elements selected with the internal collage alignment grid enabled. Go back through steps 1 through 11. Remember that pan and tilt adjustments are also available when using a DL.3 or DL.2 fixture.

Now you have a rough adjustment of the spherical mapping effect. From this point, finely adjust all the parameters until you bring the output to the desired shape.

When fine tuning Spherical Mapping adjustments, remember the following:

The Graphic Object effect 253 Modifiers 1 and 2 have a major influence on the shape of the vertical lines.

The Spherical Mapping Global Effect modifiers can be used to provide fine control of the shape of the vertical lines, but should be within several degrees of the expected latitude and longitude values.

The Graphic Object effect 253 Modifiers 1 and 2 are used to finely adjust the vertical bend in horizontal lines.

Spherical Mapping Tips

If the fixtures are arranged symmetrically around the sphere, the adjustment made to the various control Modifiers of Global and Graphic Spherical Mapping effects with be the same or nearly the same when the fine tuning is complete. You can save time by selecting the Modifier on all the fixtures you are using for the collage and making each adjustment on all the fixtures together.

Projector Pan, Tilt, and Zoom also affect alignment.

Don’t make small changes until the alignment is roughed in.

When alignment doesn’t seem to be working, record and store you current settings, then go back to the default values and begin again.

The longitude angle is the angle between fixtures from the vertical axis of the sphere and should be defined in your lighting plot. The plot should also give you a good idea of the latitude angle. The final values and those theoretical values should be close.

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Axon Media Server User Manual

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High End Systems AXON user manual Spherical Mapping Tips, 116

AXON specifications

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