Re: multi channel option

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Allan Schaffer (aschaffe++at++shark.paris.sgi.com)
Fri, 10 Feb 1995 18:47:20 +0100

On Feb 10, 5:40pm, Henrik Ladholm wrote:
>
> Hi out there, specifically someone at SGI We have the multi channel
> option and a reality engine ONYX with two RM. We use three projectors
> for the display. With the 3++at++960x680_60 choice and 2 RM we can`t get
> antialiasing. Next lower resolution is 4++at++960x680_60. Is it possible
> to get 3++at++960x680_60 ? If not, is it a question of money or fact ?

Although I don't have the table in front of me, I suspect that
particular format requires 4 RM's in order to use multisampling.

Anytime you want to do multisampling you need the framebuffer to be
configured with 'medium' or 'large' pixel depth, but not 'small'.
Pixel depth is controlled (in essense) by (resolution / RM count).
Run /usr/gfx/gfxinfo to see your current pixel depth, and notice
how it changes as you change to various video formats.

Speaking practically, your options are to use a lower-resolution
video format (instead of 3++at++960x680_60), or to purchase additional RM
boards.

Regards,
Allan

-- 
Allan Schaffer
Silicon Graphics
aschaffe++at++sgi.com
http://reality.sgi.com/employees/aschaffe

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