Goodies Menu Help in the DAVE master widget

Stereo

Pops up a widget which enables a stereo display when the MONO/STEREO button is toggled. Disparity angle can be controlled (larger disparity provides more depth but may make an image pair hard to fuse).

Single Buffer - paused

Causes the display to shift to single buffer mode whenever it is paused. This mode has a higher image quality since it uses twice as many bits per pixel. When in this mode the user will actually see the image being drawn (when it is paused). The current buffering mode is displayed in the DAVE viewing window title bar (this is not the same as the menu setting since that only controls the mode when paused). There is no need to use this on the GTX since it already has twice as many (48) bits as the other machines.

Dithering

Uses dithering to generate more possible display colors at the expense of a slight loss of spatial resolution. This tends to make the shading on object surfaces look smoother and have fewer contour artifacts. Dithering is almost a necessity on 8 bit systems (like INVITRO). Dithering tends to make volume data look worse. If dithering is activated it will say so in the DAVE viewing window title bar.

Load Map

This allows a personalized color map (as produced by cedit and savemap, see their man pages for more details) to be loaded. It must be loaded into the same map that is being used to display an object (default = 1 for objects , see the -IC command line option; default = 15 for data volume maps, see Edit Volume menu). If you used savemap to save map 10, say, then you can only load it into map 10 in DAVE. A "map" is every 256 entries in the color map (starting with map 0 going from 0-255). Note: use of the Edit Map widget will cause the personalized map to be replaced with a modifiable grayscale (i.e., don't try to modify your custom map with Edit Map).

Depth Cue

Turns intensity depth cueing on. This makes wireframes which are closer appear brighter, and those further away blend into the background. This is still somewhat buggy. See the "d" key option in the main DAVE widget help for further details (the "d" key does the same thing as this menu item).

Create (Movie) Script

This is a widget which permits the saving and playback of a data "fly through". Key frames can be specified and the system automatically interpolates between them; thus creating a very smooth flight through the data. These scripts can be annotated with a voice over (only GRAPHICS, INVIVO, and INVITRO have audio capabilities). See the _____ command line option in dave for specifing a script file to read in. Note: since only matrices are actually saved to a file, these scripts take up almost no space to store (except for voice-overs which are about 8kB/sec of talking). See also RGB Movie on the Stuff menu.

Change Light Dir.

Change the direction the front light is coming from. The same as the "l" key in the DAVE viewing window.

Reverse Normals (toggle)

Occassionally the system gets confused when reading in the objects from a file (e.g., from a pts file) and therefore when the objects are displayed as surfaces they appear inside-out. Thus, the outside appears red and the inside is shaded white. This toggle inverts this so they appear correct.

Flip Polygon

Occassionally one (or a few) of the outlines (polygons) which compose an object is not oriented correctly (e.g., clockwise) relative to the other polygons in the object. This widget permits manual specification of which polygons to flip to correct the problem. Most users should not use this.

Snoops

This opens up another viewing window which is a magnified view of a very small piece of the scene. It shows a subvolume of 12 by 12 data voxels in x and y. In z either all the data planes are shown (default) or only 12 planes are shown (if Render Cubes is specified - see Edit Volume help). The subvolume chosen is those voxels centered around the rotation point in the main viewing (i.e., the voxels in the center of the main window). You can center on any known coordinate using the Edit Crosshair widget. NOTE: To get rid of this window press the ESCAPE key when the cursor is in the snoops window. DO NOT pick "quit" from its menu - this will teminate the entire DAVE session.

ROI Analysis

This widget performs Region Of Interest analysis on volume data. It allows the user to analyze image data by creating histograms of data inside a specified region of interest or to plot data along a line in 3D. Regions are specified by moving a 3D crosshair which is controlled by the Edit Crosshair widget (on the Edit Menu in the DAVE Master Widget).

Colocal Analysis

This widget controls which voxels are displayed based upon each voxel's degree of colocalization (assuming two images are present). Thus voxel which do not have high colocalization can be eliminated from the view. Colocalization statistics are printed out.

Count Image Objects

This widget counts up the number of connected regions in the image and prints out statistics about them.

Single Buffer - moving

Causes the display to be in single buffer mode whenever the image is moving. This mode has a higher image quality since it uses twice as many bits per pixel. When in this mode the user will actually see the image being drawn (when it not paused). Thus you would not normally wany this option turned on. However, it you are making movies (RGB movie), each image is saved after it is completely drawn. So you don't care if you see the image change as it's being drawn; you'd rather get the higher quality for the movie. There is no need to use this on the GTX since it already has twice as many (48) bits as the other machines.

Dithering

Uses dithering to generate more possible display colors at the expense of a slight loss of spatial resolution. This tends to make the shading on object surfaces look smoother and have fewer contour artifacts. Dithering is almost a necessity on 8 bit systems (like INVITRO). Dithering tends to make volume data look worse. If dithering is activated it will say so in
Copyright 1995 by Lawrence M. Lifshitz and the University of Massachusetts Medical School. All rights reserved.