you can use the scalar state (raylength) drive the into a gradient
(use the mixer one because it got a input) input, then you get your
clamp for free. the last tab in the gradient lets you adjust the near
and far values. oplug the output of the gradient into the surface to
see the effect in the render region.
if that looks right use the gradient output to odulate the bump or
control a 2mix or whatever :)
ciao
franky
Thursday, August 16, 2007, 12:45:47 PM, you wrote:
AF> Use a scalar state node set to raylength, you will also need to
AF> clamp the min and max values using basic
AF> math nodes.
AF> A.
AF> -----Original Message-----
AF> From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM]On Behalf
AF> Of Mr Creighton
AF> Sent: 16 August 2007 11:38
AF> To: XSI(at)Softimage.COM
AF> Subject: Bump falloff by camera distance
AF> Hi there,
AF> Apologies for what is likely to be a ridiculously simple question. I'd
AF> like to be able to control a bump map's effect based on camera distance,
AF> so that a terrain object has a bump effect whilst close-up but fades to
AF> nothing as it recedes from the camera. I've been trying to get this
AF> working by playing about with Incidence nodes and ScalarState (Ray
AF> Length) / Scalar2Color nodes, but am unable to generate the effect I'm
AF> after.
AF> In Max I'd drive this effect with a Falloff map, but something about
AF> Incidence nodes in XSI is eluding me.
AF> Thanks,
AF> Dan Creighton
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