 | | | Passes, partitions, models and instances question | Passes, partitions, models and instances question 2005-05-27 - By Bradley R. Gabe
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Not a bug.
An instance is an instance. If it could be split out into separate
geometries and whatnot, it would be called something else, like a multi. :-P
The rule with instances is so goeth the master, so goeth the instance. If
you need to use instances in order to save memory, then you won't be able
to split them out into separate passes and partitions, since modifying the
master's materials will affect all your instances.
However, if you are using them in order to refer to one original source, so
you can carry the source's modifications through the duplicates, you might
be able to use clones instead. With clones, you decide at which point of
the operators and properties you want to veer from the original.
Unfortunately, clones don't do anything to optimize your memory and
performance, so if you need a really big scene be prepared for rough sailing.
I think it's possible to do more advanced instancing things in mental ray
than what XSI provides. Are there any MR gurus out there willing to fill us
in on some more details? I'd be interested in that info.
-Brad
>Hi all,
>
>Maybe I'm overlooking something basic here, or did'nt read that fantastic
>manual closely enough ;)
>Or maybe it's already discussed to death on this forum and is my
>"Advanced" find in Outlook not so... well... advanced....
>
>- Ok, so I have some geometry, a model and a bunch of instances of this model.
>- I create a new pass and two partitions. In partition "A" I put my
>geometry, my model and some instances.
>- In partition "B" I put the rest of my instances. But when I set my
>render options for partition "A", my instances in "B" will automatically
>"share" the values from "A".
>
>Is it not possible to "split" scenes when having multiple instances of the
>same model in different partitions in the Pass??
>Or do I have to go the override route?? Or is this a <ahum> bug..... (runs
>for cover.....)
>
>
>cheers for the replys,
>
>rob wuijster
>s-5 multimedia
>holland
>
>
<html>
<body>
Not a bug.<br><br>
An instance is an instance. If it could be split out into separate
geometries and whatnot, it would be called something else, like a multi.
:-P<br><br>
The rule with instances is so goeth the master, so goeth the instance. If
you need to use instances in order to save memory, then you won't be able
to split them out into separate passes and partitions, since modifying
the master's materials will affect all your instances.<br><br>
However, if you are using them in order to refer to one original source,
so you can carry the source's modifications through the duplicates, you
might be able to use clones instead. With clones, you decide at which
point of the operators and properties you want to veer from the
original.<br><br>
Unfortunately, clones don't do anything to optimize your memory and
performance, so if you need a really big scene be prepared for rough
sailing. <br><br>
I think it's possible to do more advanced instancing things in mental ray
than what XSI provides. Are there any MR gurus out there willing to fill
us in on some more details? I'd be interested in that info.<br><br>
-Brad<br><br>
<blockquote type=cite class=cite cite=""><font face="arial" size=2>Hi
all,<br>
</font> <br>
<font face="arial" size=2>Maybe I'm overlooking something basic here, or
did'nt read that fantastic manual closely enough ;)<br>
Or maybe it's already discussed to death on this forum and is my
"Advanced" find in Outlook not so... well... advanced....<br>
</font> <br>
<font face="arial" size=2>- Ok, so I have some geometry, a model and a
bunch of instances of this model.<br>
- I create a new pass and two partitions. In partition "A" I
put my geometry, my model and some instances.<br>
- In partition "B" I put the rest of my instances. But when I
set my render options for partition "A", my instances in
"B" will automatically "share" the values from
"A".<br>
</font> <br>
<font face="arial" size=2>Is it not possible to "split" scenes
when having multiple instances of the same model in different partitions
in the Pass??<br>
Or do I have to go the override route?? Or is this a <ahum>
bug..... (runs for cover.....)<br>
</font> <br>
<br>
<font face="arial" size=2>cheers for the replys,<br>
</font> <br>
<font face="arial" size=2>rob wuijster<br>
s-5 multimedia<br>
holland<br>
</font> <br>
</blockquote></body>
</html>
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