[Bf-funboard] On the subject of object IDs and renderpasses

[Matt Ebb]

On the contrary, I'd say the way that it works there in Max is more  
of a crappy workaround for their lack of render layers, as we have  
them. We have a fully fledged node based compositor where we can  
apply effects to different pieces of imagery with great flexibility,  
all they have is a totally non-visual system of mapping a number to a  
set of pixels, and the interaction is limited to that. yuck.

For doing things that are part of the final result that you're going  
to plan in advance, it's much, much better to use render layers.  
Unlike Object ID channels, render layers are *anti-aliased*, and will  
also provide extra pixels that would otherwise be occluded, which can  
be useful for all sorts of things like blur and glow. In this context  
(i.e. not as a workaround for lack of renderlayers), the main benefit  
as I can see (and as I have used in the past) for the object ID  
channel is just to have it there just in case you want to make crude,  
small modifications later without having to re-render the entire thing.

Matt



On 07/12/2006, at 15:11 PM, Bassam Kurdali wrote:

> I saw some mention on the blender cvs and committer's list about  
> object
> IDs in renderpasses.
> Back when I used Max, you could assign IDs to materials or objects.
> Several materials could use the same ID, and they were used to
> selectively apply effects in MAX's video post. The same seems to be  
> the
> case for the old blender glow texture and sequence plugin- indeed,  
> glow
> was the primary use for that feature in MAX.
> Now, is it the case with blender renderpasses that several objects can
> share the same ID? I can see that being useful, especially if the
> principle is expanded so materials can get assigned IDs too.ID's per
> object are not that useful, since you can put an object quite  
> easily on
> a renderlayer by itself, but there are cases where you might want that
> object rendered with something else, but have only that object glow or
> something.... like a light reflected in a mirror, or something.
>
>
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------------------------------------------
Matt Ebb . matt at mke3.net . http://mke3.net



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