beshers@cs.columbia.edu (Clifford Beshers) (05/08/91)
I've recently been doing some animation using Starbase that consists solely of points. Interestingly, the only way to display a single 3D point is with the marker function. Using polymarker works quite well. I can get between 10 and 30 thousand points per second. Unfortunately, they are all of the same color. The polymarker function seems to ignore the color/vertex specification I give it and just uses the marker color. The only other way to draw points is by drawing small lines, which is costly both in space and time. Does anyone know of a faster way of drawing 3D colored points? Thanks, Cliff -- ----------------------------------------------- Clifford Beshers 450 Computer Science Department Columbia University New York, NY 10027 beshers@cs.columbia.edu
billk@hpsad.HP.COM (Bill Katz) (05/08/91)
Try the marker_color() command. From the polymarker(3G) man page:
The marker is drawn with the current marker_color. As with
all output primitives, polymarker is affected by the current
drawing_mode and write_enable.
MARKER_COLOR(3G) MARKER_COLOR(3G)
NAME
marker_color - select color for subsequent polymarker
primitives
.
.
.
Polymarker primitives are altered by this procedure.
Hope this helps.
Disclaimer: I just work on Spectrum Analyzers, I don't speak for HP.
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______________________________________________________________________________lang@hpfcso.FC.HP.COM (John J. Lang) (05/10/91)
> Try the marker_color() command. From the polymarker(3G) man page:
marker_color can be used to set the color of markers, but every marker in
a single polymarker is still the same color. It would be possible to follow
each marker color with a single point marker, but with a large loss in
performance.
Another way to do points besides move/draws is single pixel block_writes.
If you are willing to work in a 2d space, this may be a faster solution.
At HP-UX 8.0 a polypoint primitives was added. It does support color
per vertex, but is only supported on the Turbo VRX. I know of no plans
to support it on other current devices.
John Lang
HP-UTD Fort Collins, CO
Any opinions are mine, HP will listen to them if it wants to.