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B3DBackingForm
  category: Balloon3D-Acceleration
  superclass: B3DTexture
  subclasses:

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instance methods
  accessing
  shouldPreserveContents

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instance methods
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shouldPreserveContents

Return true if the receiver should preserve it's contents when flagged to be clean. Most forms can not be trivially restored by some drawing operation but some may.

class methods
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