[comp.sys.sgi] PI performance questions

bennett@galois.sgi.com (Jim Bennett) (06/06/89)

There have been a couple questions posted about the Personal Iris that haven't
received answers.  Here is the information that I have on these topics.

Urs Meyer at University of Zurich wrote:

> Our Personal Iris 4D/20G running SD3.1C exhibits problems when drawing
> polygons.  The top pixel row and the right pixel column are not 
> affected by the polygon drawing routines (bgn/endpolygon, v3...).

True, this is a bug in the viewport code in 3.1C, which has been fixed in
3.1D.  3.1D should be available, it is the release currently being shipped
on new units.

Steve Dempsey at UCSD wrote:

> Question:
> 	Do the non-GT and Personal IRIS 4D workstations also suffer from poor
> 	display list performance?

The Personal Iris display listable routines (move and draw) run at the same
speed as the non-display listable routines (v3f, etc.), so this problem
should not exist on the Personal Iris.

I don't know for sure about the other non-GT architectures.


Jim Bennett (bennett@sgi.com)