From: Bram Stolk (bram++at++sara.nl)
Date: 02/01/2001 08:53:13
pfHello(),
When using performer 2.2 on SGI, and loading inventor files I get
invalid geometry.
After some experimenting, I came to the following conclusion:
It seems that the indices for indexed linesets must be either
ordered as increasing, or decreasing, but never mixed.
ivview does not have this problem, however, perfly does.
For instance, line indices like:
0,1,-1,
1,2,-1,
2,3,-1,
0,3,-1
are OK.
But the indices
0,1,-1,
1,2,-1,
2,3,-1,
3,0,-1
are not.
To my surprise:
1,0,-1,
2,1,-1,
3,2,-1,
3,0,-1
is OK again,
but:
1,0,-1,
2,1,-1,
3,2,-1,
0,3,-1
is not OK.
All index sequences are ok with ivview. Perfly shows missing lines.
Here is an example of an .iv file that is rendered correctly by ivview as
a rectangle. Perfly, however, renders too few lines (although pfStat lists
all lines... really weird!)
#Inventor V2.0 ascii
Separator
{
Material
{
emissiveColor 1 1 0
}
Coordinate3
{
point
[
-5 -5 0,
5 -5 0,
5 5 0,
-5 5 0,
]
}
IndexedLineSet
{
coordIndex
[
0,1,-1,
1,2,-1,
2,3,-1,
3,0,-1,
]
}
}
Finaly, this problem also occurs on longer primitives,
like lineset indices as '0,1,2,3,0'.
Is this fixed in 2.4, or is there a patch available for 2.2?
Regards,
Bram Stolk
-- ------------------------------------------------------------------------------ Bram Stolk, VR Specialist. SARA Academic Computing Services Amsterdam, PO Box 94613, 1090 GP AMSTERDAM email: bram++at++sara.nl Phone +31-20-5923059 Fax +31-20-6683167"I heard if you play the NT-4.0-CD backwards, you get a satanic message." "Thats nothing, if you play it forward, it installs NT-4.0" ------------------------------------------------------------------------------
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