This method works for me.
1. Install Java3D. Once installation is complete, go to C Drive -> Program Files -> Java.
You should be able to see two separate folder of Java3D and your main java installation folder.
2. Move all the file contents in Java3D to the current Java version you have.
Copy "j3dcore-ogl.dll" from Java3D\bin to %current_java_jre%\bin.
Copy "j3dcore.jar","j3dutils.jar","vecmath.jar" from Java3D\lib\ext to %current_java_jre%\lib\ext.
3. Open electric, go to Help - > About Electric... -> Plugins. Check whether Java3D is installed.
Then, you may visualize your designed layout as 3D view.
Regards.