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Step 3Using the Applet
Now you're ready to start making sketches.
Step (1)
Unzip the Capture Applet to a local drive, then open the exe inside the windows.application folder. After a few seconds a window should open that looks something like the image below. Now, either turn on your LED (if you decided to go with a pre-made flashlight) or slide a battery in between the two leads. If you're going with option two, make sure the voltage of the battery falls within the LED's acceptable range.
Step (2)
Position you light so that it can be seen by both cameras. A small green circle will show you the position that the camera sees as the greenest spot on each video feed. I've defined the greenness of a pixel based on its RGB value like this:
Greenness = G/4 + (G-R) + (G-B)
Which favors bright green pixels, making a semi-dark room without many green things in it an ideal environment.
The positions of the 0.5% greenest are averaged to find position of the light in each video feed. Both coordinates from the XY camera feed and one from the Z camera feed are used to construct a 3D point.
Step (3)
When you're ready, press the Start Capture button. A green line will appear in the Path Display box. That is the XY plane projection of your path. It should give you an idea of how much of your frame you're using, but (if you're drawing instead of attaching the LED to a dancer) you shouldn't use it as a drawing guide. Instead, think about the shape you're drawing in space. You'll get a much better result.
Step (4)
Press Stop Capture when you're done. If you're happy with the path you've draw, press Export . You'll notice that the export button has a number after it. That number will increase each time you make a new path and choose to export it. The number you see at the time of exporting will be the name of the exported text file. To keep all names unique, the date and time at which they are exported is also included in the name. The text files will write to the same folder as the exe and will be named like this:
path_data_1_y2008m8d19h10m2s25.txt
Step (5)
You can record and export as many paths as you want. When you're finished, make sure to quit by clicking on the small X in the corner of the applet. That will clear the cameras from Quicktime.
Now you're ready to make the sculpture geometry.
Step (1)
Unzip the Capture Applet to a local drive, then open the exe inside the windows.application folder. After a few seconds a window should open that looks something like the image below. Now, either turn on your LED (if you decided to go with a pre-made flashlight) or slide a battery in between the two leads. If you're going with option two, make sure the voltage of the battery falls within the LED's acceptable range.
Step (2)
Position you light so that it can be seen by both cameras. A small green circle will show you the position that the camera sees as the greenest spot on each video feed. I've defined the greenness of a pixel based on its RGB value like this:
Greenness = G/4 + (G-R) + (G-B)
Which favors bright green pixels, making a semi-dark room without many green things in it an ideal environment.
The positions of the 0.5% greenest are averaged to find position of the light in each video feed. Both coordinates from the XY camera feed and one from the Z camera feed are used to construct a 3D point.
Step (3)
When you're ready, press the Start Capture button. A green line will appear in the Path Display box. That is the XY plane projection of your path. It should give you an idea of how much of your frame you're using, but (if you're drawing instead of attaching the LED to a dancer) you shouldn't use it as a drawing guide. Instead, think about the shape you're drawing in space. You'll get a much better result.
Step (4)
Press Stop Capture when you're done. If you're happy with the path you've draw, press Export . You'll notice that the export button has a number after it. That number will increase each time you make a new path and choose to export it. The number you see at the time of exporting will be the name of the exported text file. To keep all names unique, the date and time at which they are exported is also included in the name. The text files will write to the same folder as the exe and will be named like this:
path_data_1_y2008m8d19h10m2s25.txt
Step (5)
You can record and export as many paths as you want. When you're finished, make sure to quit by clicking on the small X in the corner of the applet. That will clear the cameras from Quicktime.
Now you're ready to make the sculpture geometry.
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