Download e-book for iPad: Obliq-3D tutorial and reference manual by Marc A Najork

By Marc A Najork

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However, the animation server thread must acquire Anim3D_lock before performing any repairs. So, by locking this mutex, the client program can prevent the animation server from updating the display. This is useful for programs that modify the scene graph such that at some intermediate points the scene graph does not reflect the intended scene. 4 The ProxiedObj Module - help ProxiedObj; TYPE ProxiedObj <: { extend: Self(X) All(Y<:{}) (Y) => X & Y } Objects of this type also contain a field "raw", which is for internal use only.

Program 18 demonstrated one way to move a camera: by modifying a transformation property that affects the camera. But all the relevant parameters of a camera, including its location and its target point (the point the camera is looking at) are controlled by properties, so instead of changing a transformation matrix, we can change the values of these properties. The following program demonstrates this technique. It creates a scene that contains a stationary torus, and a cone that moves around in a circle.

GO_StackError, invokePositionCB: (mr: PositionRec) => Ok, pushKeyCB: (cb: KeyCB) => Ok, popKeyCB: () => Ok ! GO_StackError, removeKeyCB: (cb: KeyCB) => Ok ! GO_StackError, invokeKeyCB: (mr: KeyRec) => Ok } TransformVal = TransformPropVal + Matrix4 A GO (or graphical object) is an object that describes some part of the scene. Geometric primitives, such as lines, spheres, tori, etc. are special kinds (and therefore subtypes) of graphical objects, and so are light sources and cameras. There is also a subtype of GO, namely GroupGO, that allows us to combine several graphical objects into a single one, thereby allowing us to impose a hierarchical structure on the scene.

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Obliq-3D tutorial and reference manual by Marc A Najork

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