Re: [JAVA3D] Transparency or detaching - make objects disappear

[Josh Richmond]

Hi Ai,

I know I'm not answering your question about transparency, but I think using a Switch 
node may be a preferable solution.

Josh

>>> [EMAIL PROTECTED] 08/12/02 07:06AM >>>
Dear all;

My scene contains about 1000 objects. I want to make about 750 of them
disappear and appear in my scene by clicking some buttons. Which one is
a better approach in terms of cheaper rendering?

1) Making the appearance of the objects totally transparent and than
opaque?
2) Detaching the objects from the scene and than attaching them again?

I chose the first approach:

Before I use transparency attributes (Code_1) the objects are looking
fine (see "without_tranparency.jpg"). Than I converted my code so that
the objects have transparency attributes (with 0.0 or 1.0 - opaque and
totaly transparent). When I apply transparency value 0.0 I expect my
objects to be totally opaque. However, the objects have some
transparency even if the value is 0.0 (see "with_tranparency.jpg"). Has
anybody got idea why this happens?

Regards
Ali


// APPEARANCE CODE_1_WITHOUT TRANSPARENCY ATTRIBUTES
  Appearance app = new Appearance();

  ColoringAttributes ca = new ColoringAttributes();
  ca.setColor(0.921875f, 0.92578125f, 0.81640625f);
  app.setCapability(Appearance.ALLOW_COLORING_ATTRIBUTES_WRITE);
  app.setCapability(Appearance.ALLOW_COLORING_ATTRIBUTES_READ);
  app.setColoringAttributes(ca);

  shape.setAppearance(app);

//******************************************************************************************

// APPEARANCE CODE_2_WITH TRANSPARENCY ATTRIBUTES
  Appearance app = new Appearance();

  ColoringAttributes ca = new ColoringAttributes();
  ca.setColor(0.921875f, 0.92578125f, 0.81640625f);
  app.setCapability(Appearance.ALLOW_COLORING_ATTRIBUTES_WRITE);
  app.setCapability(Appearance.ALLOW_COLORING_ATTRIBUTES_READ);
  app.setColoringAttributes(ca);

  TransparencyAttributes ta = new TransparencyAttributes( );
  ta.setTransparency(0.0f);
  ta.setTransparencyMode(TransparencyAttributes.BLENDED);
  app.setCapability(TransparencyAttributes.ALLOW_VALUE_WRITE);
  app.setCapability(TransparencyAttributes.ALLOW_VALUE_READ);
  app.setCapability(Appearance.ALLOW_TRANSPARENCY_ATTRIBUTES_WRITE);
  app.setCapability(Appearance.ALLOW_TRANSPARENCY_ATTRIBUTES_READ);

  app.setTransparencyAttributes(ta);
  shape.setAppearance(app);

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