Problem with java3d

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http://unix.stackexchange.com – I want to play this java simulation: http://www.compadre.org/OSP/items/detail.cfm?ID=9640 in java 3d mode on a linux (ubuntu) system. But it doesn't work. If I switch to java 3d-mode it complains that java 3d is not installed. sudo aptitude install libjava3d-java didn't help. Then I did a right click in this java app and selected Diagnostics-> About Java 3D. Then I get the message: Java 3D was not found in: /usr/lib/jvm/java-6-openjdk-i386/jre/lib/ext:/usr/java/packages/lib/ext Then I tried cp /usr/share/java/*3d* /usr/lib/jvm/java-6-openjdk-i386/jre/lib/ext but I get the same error me (HowTos)