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<p class="MsoPlainText">Following my email, below is a code defining parametrically a torus with as many LODs as required. It is also available here http://www3.ntu.edu.sg/home/assourin/teaching/LOD/lod2a.wrl (with the FVRML plugin installed)<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Best Regards,<o:p></o:p></p>
<p class="MsoPlainText">Alexei Sourin<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">EXTERNPROTO MyShape[<o:p></o:p></p>
<p class="MsoPlainText"> exposedField SFString color<o:p></o:p></p>
<p class="MsoPlainText"> exposedField MFInt32 shapeRes ]"MyShapeProto.wrl"<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">LOD { range [5,8,12,20,80] <o:p></o:p></p>
<p class="MsoPlainText">level [ <o:p></o:p></p>
<p class="MsoPlainText"> MyShape {shapeRes [100 100] }<o:p></o:p></p>
<p class="MsoPlainText"> MyShape {shapeRes [75 75] }<o:p></o:p></p>
<p class="MsoPlainText"> MyShape {shapeRes [50 50] } <o:p></o:p></p>
<p class="MsoPlainText"> MyShape {shapeRes [30 30] } <o:p></o:p></p>
<p class="MsoPlainText"> MyShape {shapeRes [20 20] } <o:p></o:p></p>
<p class="MsoPlainText"> MyShape {shapeRes [10 10] }<o:p></o:p></p>
<p class="MsoPlainText">] }<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">.............................................................................<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">PROTO MyShape[<o:p></o:p></p>
<p class="MsoPlainText"> exposedField MFInt32 shapeRes [10 10] ]<o:p></o:p></p>
<p class="MsoPlainText">{<o:p></o:p></p>
<p class="MsoPlainText">FShape {<o:p></o:p></p>
<p class="MsoPlainText">appearance Appearance {<o:p></o:p></p>
<p class="MsoPlainText">material Material { <o:p></o:p></p>
<p class="MsoPlainText">diffuseColor 1 1 1<o:p></o:p></p>
<p class="MsoPlainText"> } }<o:p></o:p></p>
<p class="MsoPlainText">geometry FGeometry {<o:p></o:p></p>
<p class="MsoPlainText">resolution IS shapeRes<o:p></o:p></p>
<p class="MsoPlainText">parameters [0.00001 6.2831853 0.00001 6.2831853]<o:p></o:p></p>
<p class="MsoPlainText">definition "<o:p></o:p></p>
<p class="MsoPlainText">x=(2 + 1*cos(u)) * cos(v);<o:p></o:p></p>
<p class="MsoPlainText">y=(2 + 1*cos(u)) * sin(v);<o:p></o:p></p>
<p class="MsoPlainText">z=1*sin(u);" }} <o:p></o:p></p>
<p class="MsoPlainText">}<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><img width="894" height="406" id="_x0000_i1025" src="cid:image001.jpg@01CA9305.034A7010"><o:p></o:p></p>
<p class="MsoPlainText">-----Original Message-----<o:p></o:p></p>
<p class="MsoPlainText">From: Alexei Sourin (Assoc Prof) <o:p></o:p></p>
<p class="MsoPlainText">Sent: Monday, January 11, 2010 8:53 PM<o:p></o:p></p>
<p class="MsoPlainText">To: 'Tom Sparks'; 'Alan Hudson'<o:p></o:p></p>
<p class="MsoPlainText">Cc: X3D Graphics public mailing list<o:p></o:p></p>
<p class="MsoPlainText">Subject: RE: [X3D-Public] Quadric surface<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">In FVRML/FX3D LOD can be done at the function level so that for different distances from the observer different rendering (polygonization) resolutions can be defined.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Best Regards,<o:p></o:p></p>
<p class="MsoPlainText">Alexei Sourin<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<o:p></o:p></p>
<p class="MsoPlainText">From: Tom Sparks [mailto:tom_a_sparks@yahoo.com.au] <o:p>
</o:p></p>
<p class="MsoPlainText">Sent: Monday, January 11, 2010 5:50 PM<o:p></o:p></p>
<p class="MsoPlainText">To: 'Alan Hudson'; Alexei Sourin (Assoc Prof)<o:p></o:p></p>
<p class="MsoPlainText">Cc: X3D Graphics public mailing list<o:p></o:p></p>
<p class="MsoPlainText">Subject: RE: [X3D-Public] Quadric surface<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">--- On Mon, 11/1/10, Alexei Sourin (Assoc Prof) <assourin@ntu.edu.sg> wrote:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">> You can also use FVRML or FX3D<o:p></o:p></p>
<p class="MsoPlainText">> function-based extension to directly write an equation of<o:p></o:p></p>
<p class="MsoPlainText">> your surface.<o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> http://www3.ntu.edu.sg/home/assourin/FVRML.htm<o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> <o:p></o:p></p>
<p class="MsoPlainText">> Best Regards,<o:p></o:p></p>
<p class="MsoPlainText">> Alexei Sourin<o:p></o:p></p>
<p class="MsoPlainText"><snip><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I looked at it a while back, but it has no LODing features<o:p></o:p></p>
<p class="MsoPlainText">to deal with super big 500,000Km+ models with centimeter detail levels<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">tom sparks<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> __________________________________________________________________________________<o:p></o:p></p>
<p class="MsoPlainText">See what's on at the movies in your area. Find out now: http://au.movies.yahoo.com/session-times/<o:p></o:p></p>
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