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Set up image cache

The Setup Cache control panel lets you allocate system memory for image storage and retrieval, showing you how many frames fit in that allocation. When you play through the sequence the first time, there is a delay while images load into memory, then it plays quickly. This feature benefits both the shotCamera and pointCenteredCamera views.

To set up the image cache

1. Open the Setup Cache control panel in Maya Live.
2. Change the view panel to shotCamera by choosing Panels > Perspective > shotCamera.
3. Switch between the Pixel Type and Cache Size settings.

You are trying to find which combination gives you the greatest storage of frames (shown in the Frame Capacity field) and the most acceptable image display. The first two settings—RGB and RGBA—store images in full color, while the last two settings—Indexed and Luminance—store images with reduced color.

The image display does not affect the tracker itself, because it uses the full color information.

4. Experiment with the Texture Method setting.

Play through the sequence to see which setting gives you the fastest playback. Texture Method controls which OpenGL method Live uses to draw images onto the image plane, as seen through the shotCamera and pointCenteredCamera views.

SubImage gives the best performance on most SGI machines. On other platforms, the Image option can dramatically improve the speed of manipulating track boxes. If SubImage and Image make the performance worse, select None.

Notes The sequence plays slowly at first until the images are stored in cache.

5. Click Save Defaults if you want to permanently store these settings.

To playback images

Play back your images in the shotCamera or pointCenteredCamera panel using the Time Slider tools. Keep in mind that the first time you play a sequence, performance is slow until the images load into memory. For faster speed while scrubbing, click the play button first, wait for the images to load into memory, and then you can scrub.

To get the desired scrubbing results, you may need to adjust the Playback Speed setting under Window > Settings/Preferences > Preferences, in the Timeline category.

When to disable image cache

Turn off the Use Cache option box if you:

• render, because the image plane will otherwise not appear
• use a movie file as a proxy
• use large, full resolution plate images without a proxy image (however, we recommend you use lower resolution proxy images in this case)
• encounter errors during playback or track box manipulation

Keep in mind that Live purges images in the cache if you turn off the Use Cache option or change the Pixel Type setting.

Note Your images may disappear when you turn off the Use Cache. Move one frame forward or backward to refresh the image plane display.