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-
- Release Notes for the Lightwave 3D Java3D Loader
- ------------------------------------------------
- Updated May 13, 1998
-
-
-
- These release notes are intended to document the known working and
- non-working features of the loader. This is important because the loader
- implements an important subset of Lightwave functionality, but it definitely
- skips many major features of Lightwave files. Please read these notes
- to make sure that the features you need are actually implemented. Or
- if you see differences between Lightwave display of your file and
- the Java3D version of that file, take a look at these notes to see
- what might not be working properly.
-
-
- Testing the Loader
- ------------------
- The application in this directory (Viewer) is intended to be a very
- basic test application for loading/viewing Lightwave 3D models. To
- use the program, type:
- java Viewer <filename>
- where <filename> is the name of a valid Lightwave 3D scene file that is
- reachable from the current directory. There is a very basic test file
- included in this directory called ballcone.lws. To load/view that file,
- type:
- java Viewer ballcone.lws
- Note that Lightwave scene files (*.lws) embed the pathnames to object
- files (*.lwo) within them, and that object files have pathnames
- to image files (for textures) embedded in them. Whatever those
- pathnames are in those files must be valid for the directory in which
- you are running the application that loads the scene file. For example,
- if I was loading in a scene file that referred to an object file
- called "data/object.lwo", then the file "object.lwo" should be located in
- a subdirectory of this current directory called "data".
-
-
- Summary of Loader
- -----------------
- The Lw3d loader was intended to implement a major subset of the features in
- Lightwave 3D that would be used for realtime 3D animations. That is, any
- features (such as Bones and other high-end rendering
- options) which would require significant rendering time were simply
- not doable. These more advanced features are intended to be rendered
- off-line, saving each frame separately and later compositing them
- together into an animation. But Java3D is a realtime 3D rendering
- system, so these type of animations just do not map into a Java3D viewer
- very well.
-
- Another category of non-implemented items are those that we simply have not
- yet gotten to. There are a few known features of Lightwave files that
- would work well through Java3D but just haven't been implemented in the
- loader yet.
-
- Although there are a lot of features that are not yet implemented,
- the basics of Lightwave 3D functionality (scene creation, animating
- objects/lights/cameras, different surface properties) all work pretty
- much as expected. So try it out and let us know non-documented items
- that didn't work properly.
-
-
- Details of Non-Implemented Features
- -----------------------------------
- This list is probably not comprehensive, but hopefully points out most of
- the features or areas where the implementation is incomplete (or not
- there at all).
-
-
- Limitations of Scene Files (*.lws)
- ----------------------------------
- 1) Bones/Skeleton
- Bones functionality is not implemented at all. Unfortunately, this
- great feature of Lightwave 3D is not currently implementable in the
- loader because the processing time that it would take to compute
- frames based on Bones data would be far more than a real-time rendering
- system can afford.
-
- The loader may, at some future point, provide a mechanism to read
- in frames of geometry that were saved from Lightwave Bones descriptions.
- That is, there are plug-ins available for Lightwave 3D that allow you
- to save out files with Bones information as a series of files with
- pre-calculated geometry for each frame; eventually we would like the
- Lightwave 3D loader to support those files.
-
- Workaround: None; the best and only workaround is to find a different
- method of animating your objects.
-
-
- 2) Spline paths
- Spline paths will be interpreted as linear piecewise paths instead,
- traveling between each control point specified for the spline.
-
- Workaround: Specify linear paths. If your path looks too hard-jointed
- through the loader, specify more keyframes for the path to smooth it out.
-
-
- 3) Object Scaling
- Scaling objects in the scene (versus the object files) is currently
- ignored.
-
- Workaround: scale the objects in their individual object files.
-
-
- 4) Shadows
- Shadows options are ignored in the loader.
-
- Workaround: None.
-
-
- 5) Envelopes
- Most envelopes are ignored. There are a couple of exceptions to this,
- such as light intensity envelopes, but even those features have not been
- completely implemented and tested.
-
- Workaround: None.
-
-
- 6) Camera effects
- All advanced-rendering camera effects are ignored in the loader. This
- includes the following items in Lightwave 3D files:
- - Lens Flare
- - F-stop
- - Focal Distance
- - Blur Length
- - Dissolves
- - Glow
- - Zoom
- - Intensity Falloff
- - Antialiasing
-
- Workaround: None.
-
-
- 7) Inverse Kinematics
- IK options such as Goal Objects and Anchors are ignored.
-
- Workaround: Animate objects directly instead of indirectly via IK.
-
-
- 8) Morphs
- All morph options are ignored.
-
- Workaround: None.
-
-
- 9) Display properties
- Lightwave allows you to specify surface properties for different rendering
- modes (e.g., wireframe color). All of these parameters are ignored and
- the full properties of any item are used at all times.
-
- Workaround: None.
-
-
- 10) Various Surface Properties
- Various minor surface properties are currently ignored, including:
- - Polygon size
- - Dissolves
- - Clip map
- - Unaffected by fog
- - Edge parameters
-
- Workaround: None.
-
-
- 11) Lights
- The following items are currently ignored for Light objects:
- - Target objects
- - Flare parameters
- - Shadow options
-
- Workaround: None for flares or shadows. For targeting problems, animate the
- light directly (versus indirectly through using Target).
-
-
- 12) Camera Targeting
- The Target option for Camera objects is currently ignored by the loader.
-
- Workaround: Animate the camera directly (versus indirectly through using
- Target).
-
-
- 13) Effects
- Most effects (from the Effects dialog box in the layout program) are
- ignored, save for fog (which should accept all parameters) and
- backdrop colors (solid backdrops only - gradient backdrops are
- ignored).
-
- Workaround: None.
-
-
- 14) Render Options
- Most options from the Render dialog box are ignored - most of these pertain
- to saving the animation in any case (something that doesn't happen through
- the Loader).
-
- Workaround: None.
-
-
-
- Limitations of Object Files (*.lwo)
- -----------------------------------
- 1) MetaNURBS
- Geometry stored in MetaNURBS format will be ignored by the loader.
-
- Workaround: pre-tessellate your MetaNURBS surfaces and save your
- geometry (object) files in that format.
-
-
- 2) Layered Object Files
- There is currently no support for the "Layered Object File Format"
- of Lightwave 3D.
-
- Workaround: None.
-
-
- 3) Reflectivity
- There is no way to reproduce the reflective properties of surfaces
- through Java3D, so any reflectivity settings in Lightwave object files
- will be ignored.
-
- Workaround: None.
-
-
- 4) Refraction
- Refractive properties of surfaces are ignored.
-
- Workaround: None.
-
-
- 5) Edge Transparency
- Edge transparency properties are ignored.
-
- Workaround. None.
-
-
- 6) Texture types
- Texture mapping is currently somewhat limited in the loader. The following
- types of texture mapping effects should work:
- - Diffuse (the texture modifies the Diffuse aspects of the surface)
- - Color (the texture modifies the Color properties of the surface).
- Textures that attempt to modify other parameters of the surface will
- be ignored.
-
- Also, the following texture types should work:
- - Planar Image Map
- - Spherical Image Map
- - Cylindrical Image Map
- Other kinds of mappings will not work (including Marble, Grid, Dots, etc.)
-
- Some Texture parameters will not work. The following should work correctly:
- - size
- - center
- Advanced texture parameters such as falloff and velocity will be ignored.
-
- Summary: There are so many texture mapping parameters in Lightwave 3D that
- it's difficult to produce a list of all of the items that won't work
- properly. In a nutshell, basic decal-type (color modifying) or brightness
- (diffuse modifying) textures that are mapped as planes, spheres, or
- cylinders should work correctly. Anything else will probably not work.
-
- Workaround: Use the basics.
-
-
- 7) Plug-ins
- There is currently no support for any plug-in capabilities. For example,
- if there are plug-in shaders specified for your file, those shaders will be
- ignored.
-
- Workaround: None.
-
-
- 8) Image Sequences
- There is no support for image sequences - textures must be static files.
-
- Workaround: None.
-
-
-