Yes! very clear and to the point. Why-o-why is this not on the first
page of the rendering manual? it should have been since day one of XSI.
Even "Rendering with Mental Ray", as far as I remember, had no mention
of this (OK, I dropped it about halfway through -real life was too
tempting).
<RANT>
Softimage should keep in mind that there ARE still plenty of freelancers
and small studios who'd like to do quality 3D without becoming or hiring
full-time programmers, without the whole thing becoming just another
tedious technical endeavour? I find the ever-growing and apparently
irreversible split between creative and technical tasks quite
depressing.
</RANT>
Thanks a lot François!
Christian Rittener
> -----Original Message-----
> From: owner-xsi(at)Softimage.COM
> [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Francois Lord
> Sent: March 24, 2006 10:18
> To: XSI(at)Softimage.COM
> Subject: Re: bump mapping with procedural textures?
>
>
> Yes. The Bumbmap Generator adds the projection to the state
> and passes
> it on to its children nodes. They recieve it, pass it to
> their children
> and so on until it reaches the Vector State node. The Vector
> State takes
> the projection from the state, puts it in the coord input of
> its parent,
> and then each node start to calculate their stuff and pass
> the result to
> their parent.
>
> The state is some kind of table containing various data about the
> object, polygon, normal, UV, distance, etc. The material node
> gives the
> state to its children in a particular order, and each node
> can read and
> write to this state. This makes it possible for a node to modify the
> state before another one reads it. This is exactly what the Bumpmap
> Generator does: it recieve the state first, modifies the normals, and
> give it back to the material node. Then it is given to the
> Phong node,
> which only reads the state and shades the object according to the new
> normals.
>
> I'm not a shader writer. I took all this from a seminar given by Dave
> Lajoie. I thought it was good stuff to know, even for
> ordinary users to
> understand the render tree better.
>
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