Interview Questions.

Question 1. What Is Vrml Useful For?

Answer :

VRML is beneficial for a ramification of programs, together with:

? Data visualization
? Financial analysis
? Entertainment
? Education
? Distributed simulation
? Computer-aided layout
? Product advertising
? Virtual department shops
? User interfaces to data
? Scientific visualization

Question 2. What Is The Difference Between Vrml 1.Zero And Vrml 2.Zero?

Answer :

The 3 essential variations are that VRML 2.Zero consists of:

? 3D sound
? Interactivity
? Object-orientated shape

Interactivity manner that items can pass around and reply to the user's movements.

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Question three. How To Put Vrml On A Web Server?

Answer :

You can FTP your VRML report onto a Web server, just as you would with an HTML document. The Web server will serve your file nicely simplest if the MIME kind is set up properly in the server.

The MIME type for VRML is "x-global/x-vrml". If you notice a pile of textual content appear whilst you try to get entry to your global out of your server, meaning the MIME kind is not set up nicely. E-mail your webmaster and ask them to set up the MIME type "x-international/x-vrml" for filename extension ".Wrl".

In addition, to serve VRML documents which have been compressed with GZIP properly, ask your webmaster to installation the Content Encoding type "x-gzip" for filename extension ".Gz" (if it is no longer already installation).

Question four. How To View Vrml On A Mac?

Answer :

There are actually numerous browsers available for Macintoshes, and not only for PowerMacs either. Browsers for 68K Macs include ExpressVR, a Netscape plug-in, and Virtus Voyager, a stand-on my own VRML viewer or helper utility.

Netscape's Live3D for PowerMac is step by step becoming solid. Other PowerMac software program consists of ExpressVR, Voyager, Whurlwind, and Equinox.

All of the preceding are VRML 1.Zero browsers. The new child on the block is RealSpace, with yes, a VRML 2.Zero browser for PowerMacs.

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Question five. How To Combine Vrml With Java And Javascript?

Answer :

There are several methods to combine VRML with Java and JavaScript. Netscape Live3D customers can use Netscape's LiveConnect technology with Live3D to affect a VRML international in an HTML web page from a JavaScript feature or a Java applet. Conceivably, different browser developers may want to upload LiveConnect interfaces.

In addition, VRML 2.0 has APIs for both Java and JavaScript, in order that Java and JavaScript can be referenced through Script nodes. The Java and JavaScript can pressure interactivity and other superior capabilities in the VRML international thru the Script node and ROUTE-ing. Sony's Community Place VRML 2.Zero browser supports the VRML 2.Zero Java API. SGI's Cosmo Player VRML 2.Zero browser helps the VRML 2.0 JavaScript API.

Other browsers might also have their personal Java APIs. Dimension X's Liquid Reality VRML 2.0 browser has its own Java API.

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Question 6. How To Navigate Through A Vrml World?

Answer :

There are three styles of modes that maximum browsers have:

fly, walk and factor but every browser makes use of barely distinctive names or patterns. In fly-like modes, it's like you are piloting a aircraft via a 3-d space, arrow keys or mouse course adjusts the path you're headed in, and you can also pass ahead and (sometimes) backwards. Walk mode helps you to flow round on an imaginary flat surface, and you need to press special keys to transport up and down.

Point mode is the great (maybe only?) excuse to apply a mouse in navigating a VRML surroundings. You click on an object you notice, and then you definitely move towards it.

Another characteristic of VRML is that you may have preset viewpoints that a world writer positions to can help you examine special vistas or perspectives within the international. Think of it as a film director positioning a digital camera whilst filming a scene. You can normally transfer between those through right-clicking and making a variety from a pop-up menu. In addition, there can be hyperlinks within the VRML world that link to other parts of the world -- other viewpoints!

It takes a chunk of getting used to, but you may step by step get the hold of it.

Question 7. How To Make A Vrml World Have A Small File Size?

Answer :

There is one easy manner to significantly reduce the document size of your VRML international. You can lessen the record size via eighty-90%!! You just want to compress it using GZIP.

GZIP is available for nearly all to be had Unix systems, plus different machines. Do a seek at your favorite seek engine to find a version to your gadget.

In Unix, if you have gzip, you simplest need to kind: gzip filename.Wrl, and your document will become compressed and feature the new filename filename.Wrl.Gz.

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Question eight. How To Add Behaviors Without Hand Editing?

Answer :

At this point, there are few VRML 2.Zero authoring equipment to be had that permit widespread behaviors, so that you're quite a lot caught the use of textual content editors. SGI's Cosmo Create consists of a few functionality.

Also, Paragraph's Virtual Home Space Builder gives the functionality of creating VRML 2.0 compliant lively textures. Look for VRML 2.0 conduct-authoring software program soon from Superscape.

Question nine. How To Have A Vrml World In A Frame Link To Other Frames?

Answer :

In VRML 2.Zero, you may use the parameters subject of the Anchor node with the value "goal=frame_name", wherein frame_name is the call of the frame to be focused by the link. Note: In VRML 2.Zero Draft 2 and in advance, the parameters subject became formerly called parameter.

Netscape's Live3D VRML 1.Zero browser has an extension to VRML 1.Zero that lets you target frames. The VRML navigation bar in VRMLSite uses this extension. You can add an additional discipline called goal and deliver it an SFString cost of the call of the frame. In addition, you may need to use a fields parameter inside the WWWAnchor node.

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Question 10. How To View Vrml Worlds?

Answer :

To view VRML, you want a VRML browser, helper application or plug-in. The maximum normally-used VRML 1.Zero browser is Netscape's Live3D, which is available on Windows and PowerMac machines.

Their are numerous VRML 2.0 browsers available in beta shape. They encompass converters that can help you view VRML 1.0 worlds as nicely. VRML 2.0 browsers encompass Dimension X's Liquid Reality, Silicon Graphics' Cosmo Player and Sony's Community Place (formerly referred to as Cyber Passage).

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Question 11. Do We Need To Compile Vrml Files?

Answer :

No, you do not need to bring together VRML documents (similar to HTML). When you view the source on worlds which have been compressed with gzip, you might imagine that they've been compiled, but they've only been compressed. VRML can be created the use of any textual content editor (so long as you realize the syntax of the language!).

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Question 12. How To Create Vrml?

Answer :

If you understand the VRML language, you can honestly create VRML in a textual content editor like notepad or just like HTML.

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Question 13. Where Are The Best Worlds?

Answer :

It may be a undertaking locating tremendous VRML worlds -- evaluate it to the task of finding cool HTML pages more than one years ago.

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Question 14. Why Do Worlds Show Up As Text When Put Them On Server?

Answer :

This occurs if the Web server has no longer been configured to supply the VRML MIME kind. What happens while the MIME kind has been set up is that once every body requests the document from the server, the server places a bit message at the beginning announcing that the record is VRML, now not text.

Question 15. Are There Many Differences Between Vrml 1.0 And 2.Zero?

Answer :

Yes, but no concerns, the incredible majority of VRML 2.Zero plugins will read your 1.0 code. Just take into account to specify within the header which model you used.

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Question 16. Is Vrml Case Sensitive?

Answer :

Yes! The maximum not unusual errors are from mis-typed case letters.

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Question 17. How To Specify The Coordinates In Vrml?

Answer :

Tridimensional shapes and routes are defined the usage of 3 coordinates X, Y and Z. Cutting down easy the X-axis is left to right, the Y-axis down to up and the Z-axis is lower back to the front. The Z-axis calls for a in addition abstraction in case you want to realize it in a theoretical foundation, however speaking practical it's just the stretching of the photo.

The unit for describing the distances to your digital world is relative, however almost anyone uses the meter unit. Of direction in case your making a model of a molecule you are not going to use meters but as an alternative Angstrom.

Angles' unit is radians, this confuses some however after a while you may get round it without difficulty. Just remember the fact that pi = 180º, that's about 3,1416 rad, so pick out up your calculator and divide, not anything greater to it.

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Question 18. How Can We Insert Comments In Vrml?

Answer :

Just placed the # individual before your comment line, similar to // for JavaScript. Remember that if your remark has  strains, you have to put the # before every line!

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Question 19. What Are Primitives In Vrml?

Answer :

Primitives are primary geometric shapes which are constructed into the language. The shapes to be had are: Sphere, Box, Cylinder and Cone. You should abuse these nodes due to the fact they may be defined in a small range of strains, retaining the dimensions of your file at a minimum.

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Question 20. What Are Nodes In Vrml?

Answer :

Nodes are the simple blocks for growing your scene. Each type of node has particular area, values and kids statements that are always inserted between  , so in no way forget about to shut your nodes.

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Question 21. What Are Scene Graphs In Vrml?

Answer :

Scene graphs are a hierarchical representation of all of the objects, visible and/or audio, that composes your virtual world. The illustration is made thru node statements that have fields and values to be determined, just like HTML tags and their parameters.

Question 22. What Composes A Vrml Document?

Answer :

The shape of the VRML document is a header, scene graphs, prototypes, routes and feedback. It's very essential to position the header on the first line of all your documents preceded by means of a # man or woman. When the browser begins analyzing them it will look for the VRML's version you used, so get it proper otherwise you may not get a accurate response from the browser.

For model 2.0: #VRML V2.Zero utf8.
And for version 1.Zero: #VRML V1.Zero ascii.

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Question 23. Do I Have To Compile My Vrml Code?

Answer :

No. Unlike Java, VRML does not want to be compiled at all. That's why it calls for a plugin for viewing it.

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Question 24. How Do We Get Started With Vrml?

Answer :

You can use any text editor to jot down your VRML code, there also are a extraordinary variety of programs to be had within the Web for special systems, some totally free and others pretty high priced.

For viewing your paintings, as I stated before, you will need a browser with a plugin, there may be quite a variety that you could choose from for one-of-a-kind structures. If you have got some programming knowledge studying VRML can be piece of cake, if no longer it nonetheless quite easy.

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Question 25. Why Should We Use Vrml?

Answer :

This language is gaining more and more popularity as a era for showing 3-D photos as it's a simple and on hand way to create interactive worlds.

Also an important feature is that VRML is encoded in UTF-eight (Unikey) layout, much like your internet page's HTML encoded in ASCII, so you can make very distinctive 3D scenes using very small documents, that can be downloaded quickly - that's one of the principal concerns when putting some thing at the internet.

For example: you can make a 3D animation emblem embedded on your homepage that takes a great deal less time to be downloaded than an ordinary animated gif.

Question 26. What Is Vrml?

Answer :

VRML stands for Virtual Reality Modeling Language. It is an ISO/IEC language advanced through a combined effort of a group of companies and 3D designers and programmers for describing 3-D scenes at the Web (fortuitously from the beginning the attempt converged to make it popular, no such success with HTML until W3C became created). The files have *.WRL extensions that can be viewed by way of a browser with the correct plugin or helper-software.

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