Cameras and the Z-Axis of the Scene Graph in Java

Generation QR in Java Cameras and the Z-Axis of the Scene Graph
Cameras and the Z-Axis of the Scene Graph
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In the examples that you have seen so far, there are only two axes the x-axis, which runs from left to right and the y-axis, which runs from top to bottomAlthough we haven t mentioned it so far, there is also a z-axis, which is logically perpendicular to the scene The coordinates on the z-axis start at 0 on the scene itself; positive z values are used for the space behind the scene and negative values for the space in front of the scene You can position a node along the z-axis by setting the value of its translateZ variable Increasing the value of this variable makes the node move further away from the user, whereas decreasing it moves it closerThe following example, which you can find in the file javafxuibasics/JavaFX3Dfx in the JavaFX Book GUI project, varies the translateZ variable of a rectangle from 0 to 300 over a period of 5 seconds, which has the effect of lifting the rectangle off the scene and moving it toward the userThe operation is then reversed, causing the shape to appear to move back onto the surface of the scene
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1 2 3 4 5 6 7 8 9 var z:Number; Stage { title : JavaFX 3D Features scene: Scene { width: 300 height: 300 camera: bind PerspectiveCamera { fieldOfView: 30 }
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10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
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content: [ Rectangle { x: 0 y: 0 width: 100 height: 100 translateX: 100 translateY: 100 translateZ: bind z; fill: ColorGREEN effect: DropShadow { radius: 10 } } ] } } Timeline { repeatCount: TimelineINDEFINITE autoReverse: true keyFrames: [ at(0s) { z => 0 } at (5s) { z => -300 } ] }play();
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The position of the rectangle along the z-axis is controlled by its translateZ variable, which is bound to the value of the script variable z on line 18The movement of the rectangle along that axis is caused by the timeline on lines 28 to 39Timelines are discussed in 18, Animation If you run this example using the TV emulator, you see the rectangle slowly grow in size as its z coordinate decreases, thereby moving it closer to your eye, and then shrink back to its original size as its z coordinate returns to 0You can see two stages in this process in Figure 14-16 The rectangle s size changes as it moves toward or away from your eye because the scene is viewed using the PerspectiveCamera installed on lines 7 to 9A PerspectiveCamera enhances the impression of a three-dimensional scene by making things further away look smaller than things that are closer9 You can also install a Parallel
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The fieldOfView variable of the PerspectiveCamera class is meant to limit the part of the scene that the viewer can see, but in JavaFX 13 it does not work
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Figure 14-16
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Animating a rectangle along the z-axis
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does not provide the perspective effect If you were to change lines 7 to 9 of this example to install a ParallelCamera and run the example again, you would see that the rectangle s size does not change as it moves along the z-axis because of this, it is impossible to tell that there is any movement at all, until the rectangle gets too close to the viewer, at which point it disappears ParallelCamera is intended to be used when you don t need 3D effects and is effectively the default if you don t install a PerspectiveCameraWhichever camera you use, it is positioned a fixed distance above the center of the scene and looks directly down at itThis limits the usefulness of the 3D features for this release, because it is not possible to produce different views of the scene by moving the camera Note
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The JavaFX TV emulator is supported only on Windows If you are not using Windows, you can still run this example by forcing the use of the Prism toolkit To do this in NetBeans, right-click the node for the JavaFX Book GUI project and select Properties; then select Run This opens the form shown in Figure 4-10 in 4, A Simple JavaFX Application In the JVM Arguments field, enter -Xtoolkit prism (without the quotes) and then run the example Unfortunately, the Prism toolkit does not work with older graphics cards that do not have graphics acceleration features built in You can do the same thing in Eclipse by adding these JVM arguments to the Run Configuration for this example
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