Alpha in VolumetoGeom

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2 total messages Started by Gus Williams Thu, 07 Jan 1993 15:16

#256

Author: Gus Williams
Date: Thu, 07 Jan 1993 15:16

37 lines
1822 bytes

Is there anyway to use the VolumeToGeom module without Alpha bitplanes?


I have a 4D35TG on which ginv gives:

Screen Resolution:  1280 x 1024 pixels.
Zbuffer Resolution: 0xFF800000 min  0x7FFFFF max.
No Accumulation Buffer present.
Alpha bitplanes in DoubleBuffered: 0, SingleBuffered: 0
Red   bitplanes in DoubleBuffered: 4, SingleBuffered: 8
Green bitplanes in DoubleBuffered: 4, SingleBuffered: 8
Blue  bitplanes in DoubleBuffered: 4, SingleBuffered: 8
Zbuffer  bitplanes present: 24
Stencil  bitplanes present: 0
Overlay  bitplanes present: 4
PopUp    bitplanes present: 2
Underlay bitplanes present: 4
User-defined Clipping Planes present: 0
antialiased points available in colormap
antialiased points not available in RGB
antialiased lines available in colormap
antialiased lines not available in RGB
antialiased polygons not available in RGB
Number of verticies per polygon allowed: 256.

The important point here is the 0 Alpha bitplanes.

I would even be interested in something slow and non-interactive like
a translation to a format understood by one of the PD ray-tracing
packages.


Assuming no luck on the above, can a 4D35/TG be upgraded to have
Alpha bitplanes? (I haven't bothered to call my Sales person yet :^) )

Thanks for any information.

Re: Alpha in VolumetoGeom

#257

Author: Roy Hashimoto
Date: Thu, 07 Jan 1993 17:37

9 lines
921 bytes

In article <1993Jan7.151604.19780@news.acns.nwu.edu> williams@casbah.acns.nwu.edu (Gus Williams) writes:
>Is there anyway to use the VolumeToGeom module without Alpha bitplanes?

It isn't alpha planes that you need, it's blend hardware.  You can write
a little program to find out if you have the proper hardware with a call
to getgdesc().  To the best of my knowledge, it is not available on PIs.

Roy Hashimoto
hashimoto@sgi.com

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