Hey, Dennis, could u possibly attach the mentioned example
AlphaApp.java? Is this tutorial available somewhere in Internet?
vladimir
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PS: u could send the example directly to my email.
Dennis J Bouvier wrote:
>
> The following is an excerpt from the next chapter (5) of the Java 3D
> API Tutorial. This particular section addresses the smoothing
> of the alpha waveform only.
>
> Chapter 5, titled Animation, will explain the Alpha,
> interpolator, BillboardBehavior, LOD, and Morph classes.
>
> Attached is an example of Alpha smoothing.
>
> Chapter 5 may be published before the end of July.
>
> I hope this helps,
> Dennis
>
> Smoothing of the Alpha Waveform
> In addition to the duration of the four phases, the programmer
> can specify a ramp duration for the increasing alpha and decreasing
> alpha phases. During the ramp duration, the alpha value changes
> gradually. In the case of motion interpolators, it will appear
> as though the visual object is accelerating and decelerating in
> a more natural, real world, manner.
>
> The ramp duration value is used for both the beginning and ending
> portions of the phase and therefore the ramp duration is limited
> to half of the duration of the phase. Figure 5-6 shows an Alpha
> waveform with both IncreasingAlphaRampDuration and a
> DecreasingAlphaRampDuration. Note that the alpha value changes
> linearly between the two ramp periods.
>
> An example program, AlphaApp.java, demonstrates the effect
> of an IncreasingAlphaRampDuration on an Alpha waveform. In
> this program there are three car visual objects. The three
> cars start at the same time from the same x coordinate and
> travel parallel. The upper car has no ramp (ramp duration = 0),
> the bottom car has maximum ramp duration (half of the duration
> of the increasing or decreasing alpha duration), and the middle
> car has half the maximum ramp duration (one quarter of the
> duration of the increasing or decreasing alpha duration).
> Each car takes two seconds to cross the view.
>
> Vladimir Olenin wrote:
> >
> > Hi,
> >
> > Let say that ViewPlatfrom is a car and i want to move it in accordance
> > with physics laws. This means that in the first place i need to specify
> > "ease-in"/"ease-out" behavior for acceleration/deceleration. It is said
> > in Java3D official documentation that for these purposes Interpolators
> > can be used (in section 9.6.2 - Acceleration of Alpha). It is said there
> > what Alpha parameters resposible for what, but, alas, no examples.
> >
> > This is quite a tough topic, so, please, if anyone out here has some
> > examples of using Interpolators or knows the sequence in which they
> > should be created/used/terminated, i would very appreciate any
> > information. Thank u!
> >
> > vladimir
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> --
> -----
> Dennis J Bouvier
>
> Find the Java 3D Tutorial "Getting Started with the Java 3D API" at
> http://sun.com/desktop/java3d/collateral
>
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