How to project a test pattern

Sometimes you may want to test your projector to see whether it's in focus and projecting properly. Ember has a few built-in test patterns that you can call from the command line via SSH. Here's how to use them:

TEST PATTERN #1: CALIBRATION

The calibration image is the most commonly-used test pattern, and it can be called by typing the following:

showcal

Because its lines are very thin, you can use it for both focusing and aligning the projector. Here's what to look for:

  • The lines are in focus at the surface of the PDMS window in an empty resin tray 
  • The white dashes at the top and bottom are the within the window

If both of the conditions above are true, your projector is aligned.

If it's out of focus, you can use a 2.5mm hex key to turn the projector focus screw just above the power plug. All projectors are aligned and focused at the factory, so you should only need to adjust it if you've removed the projector or otherwise modified your Ember's optics.

When you're done using it, type the following to turn it off:

echo showblack > /tmp/CommandPipe

If you're doing a full calibration of your projector, you'll probably want to use the next test pattern to calibrate your projector's irradiance.

TEST PATTERN #2: ALL WHITE

This test pattern is an alternative to using the standard exposure test (exp_test.tar.gz) used when calibrating a projector's irradiance. It's more convenient because you don't have to wait for the build arm to descend before you can test your projector's irradiance. To use it, type the following:

echo showwhite > /tmp/CommandPipe

When you're done using it, type the following to turn it off:

echo showblack > /tmp/CommandPipe

 

TEST PATTERN #3: GENERIC TEST PATTERN

This is our original test pattern that we've kept around just because it's occasionally useful for various things. It shows the extents of the projected image on all sides (the white dashes). To use it, type the following:

echo test > /tmp/CommandPipe

When you're done using it, type the following to turn it off:

echo showblack > /tmp/CommandPipe

 

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