1 2 3 1 2 3 This Paper Presents the Design, Implementation and Evaluation of the Etree, a Database-Oriented Method for Large

1 2 3 1 2 3 This Paper Presents the Design, Implementation and Evaluation of the Etree, a Database-Oriented Method for Large

ETREE — A DATABASE-ORIENTED METHOD FOR GENERATING LARGE OCTREE MESHES ¡ ¢ Tiankai Tu David R. O’Hallaron Julio C. Lopez´ £ Computer Science Department, [email protected] ¤ Computer Science Department and Electrical and Computer Engineering Department, [email protected] ¥ Electrical and Computer Engineering Department, [email protected] Carnegie Mellon University, Pittsburgh, PA, U.S.A. ABSTRACT ¦¨§ © § ! ©#"$&%'© () * ()+,-© ./012/*#3 © ./4.56§ 87:9<;77:%=> -,$? @A.$© B0()§!.+85C.$D*#-"/ ./3@[email protected]() §4"/!,© .$&HJIK3!D( © L©#BM© .8( $ L$L.EG.18 -,$? F N3 E:3!FO 5C.$(P*#* .E./ :,© ./! Q?RFS3 :R!© !"§ -,$? $ /HUT03! WV¨.X -,$? $ E:§! ©#S3 ¨YZ§!*#© !BQS+3 /+$[§!\]@^ .©# !_)$) N.`§ a.E,+ 6.$X!© bHcT0a©#.+3 EUdV=.WV¨. VJE:§! ©#S3 'Ye$3!.B2+© "f-©#.$F)* .EB$*g?*#$ E©#!" .h/ + =§!K E©#*i!B).$5j() §)"/ ,-©#.$&H]kc* ©#()© R 2$$* 3-© ./X 3 "/"$ N ¨§-¨§ a`()§ .+)© 6GlgE© 2f V6R>.5m"/!,© " 2f:RF*#"$h.E() §! hn<op qGrQ\sVU©t§OuBqp v ()© *#* © ./w* ()+ ,x¨.$M)()().R+@W* © ()©tB ( $E,§ © nNu-yz {F\6x:H |[}+~ih/ Ki/-}+}0M}B]j}+-}}'Cj}+ i/-}+}'j4&&C!BCmmCi/¨ Cjfjj]-}+} 1. INTRODUCTION ( $b/a©t= ./ © ? * `. N.`*#"$Q() §! ].$ E./+2f© ./ $* !© b+ Hm¯j-"/`( $© G()().$R)E$ E©t© `E$F .2+©#!K5C@ 5E© 2f>EB$E,§ X5C.$ § >!,1 N.BJ./°!© bH±`4© !@ ¦¨§ © D© $L_E©t©#!"w()./()5.D§ X() §O"/ ,-©#.$ EB BN/I²§!./3!"/§! 3!( $bf ©tD .$ ©#?!* [.M N$( E.$()(3 !©tdRHaQ© bFEB $E© WRw© Q_ * .+!© !"G> !© Eh *#"$ $()./3! 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N3 EB?$*# EB3 © !" § D9<;N·$¶ &¿; N &% () §!@A E© ­ EQ© !5C.$( © .$> 3 E,§>$ ©t§ :]© @WE.$6.$]./3@[email protected]()§ .+ HcaD© !@AE.$U* "/.$@ § * ()@A .+!*#© ./! § © O8§!D .+ '&E..$,© @ - ma!:©#2/B5./( § 6? $*#$!EB.E/%+$ N.$ © FdV=.G!,?$ %g./ 5C.$K§!() §F* () %$[§! Application .$§!U5.a§!() §X .+! H Etree API n g e o r application-specific input n l i e i t r a o a c t t element a e c n d u g n o i a i database a l A v L L u a a q b n construct unbalanced balance balanced transform octree octree etreelibrary etreelibrary etreelibrary B-Tree node database Etree library Figure 2: Etree method of generating octree meshes. Figure 3: Etree architecture. ¨=./!E 3$* *tR%f 3!E:§` .E mEB$h?6©#() !* ()BQVU©t§ 3! ©#S3 )bfR8EBO? [,/©t©#.$*6 -,$? NR! 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