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displacement tiling issue

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displacement tiling issue

Unread postby mafriedl » Sat Aug 15, 2020 12:32 am

I'm new to Clarisse and was wondering if anyone could shed some light on an issue that I'm having. I'm trying to tile two displacement maps that I downloaded from the USGS (32bit tiffs). They displace nicely, except for the edges. I was able to fix the infinite downward displacement by clamping the low values to 0. But I'm still left with the nasty edge around the displaced mountain. This becomes an issue when trying to tile together multiple maps. I tried bringing the map into photoshop and reducing the canvas size from 10000px to 9000px, just to see if I could get a clean edge, but those edges were still there when brought back into Clarisse.

The tiff I'm using can be downloaded from here: https://www.sciencebase.gov/catalog/ite ... e35a21f215
Attachments
unclamped.JPG
geotiff before clamp
clamped.JPG
geotiff clamped
tileEdges.JPG
two tiles next to each other (each a separate displaced poly grid) showing the raised edge issue
mafriedl
 
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Re: displacement tiling issue

Unread postby dboude » Mon Aug 17, 2020 10:42 am

Hi,

The website is down momently. I'll give a try later. Or perhaps you could upload the map on the web ?

Cheers
Démian
Isotropix
Technical Artist - Clarisse Specialist
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dboude
 
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Re: displacement tiling issue

Unread postby ayanik » Mon Aug 17, 2020 11:48 am

With the default texture Repeat mode you will get these issues because the displacement map is not seamless and it will try blending the pixels at the borders.

Set the displacement map file U and V repeat mode to Edge. This will fix it.
ayanik
 
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Re: displacement tiling issue

Unread postby mafriedl » Mon Aug 17, 2020 4:47 pm

That indeed fixed it - thank you!
mafriedl
 
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