The -b option allows the user to give a bounding cube for the scene, starting at xmin ymin zmin and having a side length size. If the cube does not contain all of the surfaces, an error results. The -b and -i options are mutually exclusive.
The -n option specifies the maximum surface set size for each voxel. Larger numbers result in quicker octree generation, but potentially slower rendering. Smaller values may or may not produce faster renderings, since the default number (5) is close to optimal for most scenes.
The -r option specifies the maximum octree resolution. This should be greater than or equal to the ratio of the largest and smallest dimensions in the scene (ie. surface size or distance between surfaces). The default is 1024.
The -f option produces a frozen octree containing all the scene information. Normally, only a reference to the scene files is stored in the octree, and changes to those files may invalidate the result. The freeze option is useful when the octree file's integrity and loading speed is more important than its size, or when the octree is to be relocated to another directory, and is especially useful for creating library objects for the "instance" primitive type. If the input octree is frozen, the output will be also.
The -w option suppresses warnings.
A hyphen by itself ('-') tells oconv to read scene data from its standard input. This also implies the -f option.
The only scene file changes that do not require octree regeneration are modifications to non-surface parameters. If the coordinates of a surface are changed, or any primitives are added or deleted, oconv must be run again.
Programs will abort with a "stale octree" message if they detect any dangerous inconsistencies between the octree and the input files.
Although the octree file format is binary, it is meant to be portable between machines. The only limitation is that machines with radically different integer sizes will not work together. For the best results, the -f option should be used if an octree is to be used in different environments.
warning - a non-fatal input-related error
fatal - an unrecoverable input-related error
system - a system-related error
internal - a fatal error related to program limitations
consistency - a program-caused error
Most errors are self-explanatory. However, the following internal errors should be mentioned:
Too many scene files
Reduce the number of scene files by combining them or using calls to xform(1) within files to create a hierarchy.
Set overflow in addobject (id)
This error occurs when too many surfaces are close together in a scene. Sometimes a dense scene can be accomodated by increasing the maximum resolution (by powers of two) using the -r option, but usually this error indicates something is wrong. Either too many surfaces are lying right on top of each other, or the bounding cube is inflated from an oversized object or an improper -b specification. Chances are, the surface "id" is near one of those causing the problem.
Hash table overflow in fullnode
This error is caused by too many surfaces. If it is possible to create an octree for the scene at all, it will have to be done in stages using the -i option.
oconv -i scene.oct book1 book2 `\!xform -rz 30 book3' > newscene.oct
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