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Tips & Techniques 4 Visible and Invisible Objects

Tips & Techniques 4 Visible and Invisible Objects. Alice. Opacity. Opacity is a measure of how "see-through" an image or an object is. The less opaque an object is, the more see-through it is. Opacity of 100%, cannot see through the object

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Tips & Techniques 4 Visible and Invisible Objects

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  1. Tips & Techniques 4Visible and Invisible Objects Alice

  2. Opacity • Opacity is a measure of how "see-through" an image or an object is. • The less opaque an object is, the more see-through it is. • Opacity of 100%, cannot see through the object • Opacity of 0%, object is transparent (like clear glass) • In Alice, an object with an opacity of 0% is invisible.

  3. Changing the Opacity • A change in opacity can be used to simulate real world conditions. • Example • A fish swimming away from the camera should fade away because water blurs our vision of distant objects.

  4. Demo • Ch04Lec4LilfishOpacity • Concepts illustrated in this example • As opacity is gradually decreased, the fish becomes less visible. • At an opacity of 0%, the object is still in the world (can still see it listed in the object tree) but is effectively invisible.

  5. isShowing • The isShowing property has a Boolean value, either true or false. • Setting an object's isShowing property to false makes the object invisible in the world. • Once again, the object is not removed from the world, it is simply not visible in the world.

  6. Demo • Ch04Lec4ChickenIsShowing • Concepts illustrated in this example • A billboard can be used to display a title screen for the animation. • A 2-second wait gives the user time to read the billboard. • Changing the isShowing property to false makes the title screen disappear.

  7. Two properties • isShowing and opacity are two different properties. • isShowing works like an on/off switch • opacity works like a dimmer switch • Although each can be used to make an object invisible, changing one does not automatically change the value of the other!

  8. Practical Uses of Invisible Objects • An invisible object is sometimes useful as a stationary marker that creates • a target for a move to instruction • an external reference point for object rotational motion

  9. Demos • Ch04Lec4InvisibleTarget • Invisible circle makes it possible to move the object to a landing target. • Ch04Lec4InvisibleReferencePoint • External reference point acts as a pivot for the rotational movement of each object.

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