S2PLOT:3dPDF
From S2PLOT
Contents |
3d-PDF: Embedding S2PLOT Content in PDF Documents
Since version 2.02, S2PLOT has been able to write the displayed geometry to a VRML 97 format file. This format was selected as it can be read in by Adobe Acrobat 3D and embedded in Portable Document Format (PDF) files. Modern versions of Adobe Reader can then render the 3-d model interactively, allowing the reader to view the 3-d scene from any angle or distance. Individual parts of the model can be turned on and off by explicit user control (eg. toggling the display of axis labels) or by implicit programmatic control (eg. toggling the selected set of slices for display as a volume rendering).
The 3-d PDF capabilities of S2PLOT are documented in the following papers. If you embed S2PLOT content in a formally published article, please cite at least one of these sources:
- Fluke, C.J., Barnes, D.G., 2008, The Interactive Astronomy Textbook, Astronomy Education Review, 7(1). For interactive figures, please download paper from here. (AER).
- Barnes, D.G., Fluke, C.J., 2008, Incorporating interactive 3-dimensional graphics in astronomy research papers, New Astronomy, 13, 599. For interactive figures, please download paper from here. (ADS) - arXiv:0709.2734.
Requirements
- S2PLOT version 2.02 or higher
- version 2.4 or higher recommended
- S2PLOT is freely available for non-commercial and educational use
- Adobe Acrobat 3D version 8.1.2
- Adobe Acrobat Pro 9 Extended expected to work but not yet tested and interface may be different to that described below
- Acrobat 3D and Acrobat Pro 9 Extended are commercial software but frequently are available at special academic and education prices
VRML export from S2PLOT
Most S2PLOT geometry can be written to VRML format. While running an S2PLOT program, simply press Shift-W and a file called "test.wrl" will be written. It will overwrite any pre-existing "test.wrl" file in the current working directory.
When writing an S2PLOT program whose output may be captured to VRML, keep the following points in mind:
- screen-coordinate geometry is not saved to VRML
- line thickness is not properly supported in VRML
- textured spheres are not presently written to VRML (next version of S2PLOT)
- transparent dots are not presently written to VRML (next version of S2PLOT)
- disks are not presently written to VRML (next version of S2PLOT)
- both static and dynamic S2PLOT geometry is saved to the VRML file
- you can organise parts of your geometry into named sections of the VRML file (model tree) by using the S2PLOT function pushVRMLname
- correct volume rendering requires special attention (see below)
- frame animation is possible (see below)
- billboards can be used but require special attention (see below)
- handles are written and can be used for particular types of interaction (see below)
- Acrobat Reader generally struggles with more than say 5000 pieces of geometry (whether points, lines or facets)
- you can programmatically export the VRML file by declaring the function "void writeVRML20(void)" and calling it from a dynamic S2PLOT callback function
VRML import to Acrobat 3D
You can either create a new document in Acrobat 3D based on a VRML file, or you can embed a 3-d figure in an existing document.
- To create a new document, simply select "Create PDF: From File ..." from the "File" menu or the main toolbar. "Control-N" should also accomplish the same result. Choose your VRML file ("test.wrl" unless you have renamed it) and then press "Open". Continue below.
- To embed a 3-d figure in an existing document, select "Open ..." from the "File" menu ("Control-O" is the usual shortcut). Select the PDF file into which you will embed the figure, and press "Open". From the "Tools" menu go to "Advanced Editing" and choose "3D Tool". Drag out the area on the document where you wish to place the 3-d figure. In the resulting "Add 3D Content" window, click on the "Browse" button next to the "3D Model" field, and choose your VRML file and press "Open", then click "OK"
You should now see the "Acrobat 3D Conversion" dialog on-screen. This dialog is slightly different depending on which path you took above, however at this point, many of the defaults will suffice. Just make sure that the "3D Format in PDF" setting in the "Import" tab is "PRC Tessellation (Faceted)", and click "OK".
Import of the 3-d VRML model will now proceed, and can take from seconds to minutes depending on the complexity of the scene. On completion, click the "Hand" icon on the toolbar, click on the figure, and you will enter "3D mode". In this mode by default you can:
- drag with the left button to modify the viewing angle
- scroll the mouse wheel to zoom in and out
- drag up and down with the right button (or shift-left button) to zoom in and out
- drag with control-left button to "strafe" the camera
- drag with control-right button to select a rectangular zoom area
The 3D toolbar (usually showing above the figure) provides control of:
- lighting
- perspective versus orthographic rendering
- background colour
- rendering mode (wireframe, shaded, et cetera)
