Displacement 'popping ' 2005-01-31 - By kim aldis
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are you using 'view dependant', Lee? If not, you should be. Then set the
length to 1, max subdee as high as it'll go. Adjust quality by lowering
length, the lower the better the quality but the more polygons.
__ __
From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On Behalf Of
Lee Hallett
Sent: 31 January 2005 20:45
To: XSI@(protected)
Subject: Displacement 'popping'
Hi all, running into a bit of a problem with displacement mapping on a Poly
object. The object is a Poly sphere (a globe) with a displacement map for
the mountain ranges - the idea is to zoom right into the mountain areas -
however I'm having trouble with the render.
The displacement (driven by the alpha channel in a 6000 pixel, cylindrically
mapped .map file) is set up with the geometry approximation set to 'fine'
with a length of 0.33 and view dependent checked. As I'm moving into the
object it starts 'popping' - adding new geometry as I move closer. Should I
simply crank up (i.e. smaller number?) the 'length' setting? I want it to
add geometry when needed, but not visibly.
Also I'm getting some strange circular artifacts popping on the model in
areas where the should be no displacement. Unfortunately I can't post
anything up on the web, so I've thrown an attatched image in. Sorry for the
bandwidth...
<<Displacement.jpg>>
I don't know where these come from, but they pop on and off, geometrically
spaced.
Lee|3d animation and design..
Pixel pusher & 'telly colouring in' bloke
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