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- Environment Variables
- Eric Pepke
- September 11, 1992
-
- Summary: Description of environment variables used by SciAn
-
- SciAn uses a number of environment variables for debugging and for setting
- default parameters. All variables begin with SCIAN_.
-
- SCIAN_SHOW_CONFIG
- If this variable is defined (any definition will do), then SciAn will
- print to standard output the decisions it makes about the machine while
- setting it up.
-
- SCIAN_VETO_RGB
- If this variable is defined, then SciAn will not use RGB mode even if it
- is present.
-
- SCIAN_VETO_CMAP
- If this variable is defined, then SciAn will not use color map mode even
- if it is present.
-
- SCIAN_VETO_DOUBLE
- If this variable is defined, then SciAn will not use double buffers even
- if it can.
-
- SCIAN_VETO_ZBUFFER
- If this variable is defined, then SciAn will not use the Z-buffer even
- if there is one.
-
- SCIAN_FORCE_ZBUFFER
- If this variable is defined, then SciAn will try to use the Z-buffer even
- if there isn't one.
-
- SCIAN_VETO_OVERLAY
- If this variable is defined, then SciAn will not use overlay planes even
- if they are there. This causes SciAn not to work most of the time.
-
- SCIAN_FORCE_OVERLAY
- If this variable is defined, then SciAn will try to use overlay planes
- even if they are not there.
-
- SCIAN_SCAVENGE_COLORS
- If this variable is defined, then SciAn will try to scavenge colors from
- the existing color map as much as it can instead of define new entries.
- This keeps the color map more pristine and may be a good idea on systems
- with not very much memory. However, it may take longer.
-
- SCIAN_COLOR_BEG
- This variable can be defined as an integer giving the start of the
- colors in the color map that SciAn writes over for its own use.
-
- SCIAN_N_COLORS
- This variable can be defined as the number of colors that SciAn can use.
- It overrides assumptions about the system.
-
- SCIAN_RECORDER_DEV
- This variable should be a string which is the path of the terminal device
- used to drive a videodisc recorder connected to the machine.
-
- SCIAN_preference
- Any variable of this form is a default preference if no preferences file
- is found. Names and values of preferences can be found in
- ScianPreferences.c. Look for the shortName field of prefInfo.
-