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Poser - OFFICIAL F.A.Q (Last Updated: 2025 Jan 27 9:18 am)

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Subject: Can someone explain to me why this is happening

bandolin opened this issue on Feb 23, 2006 · 10 posts
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bandolin ( ) posted Thu, 23 February 2006 at 10:39 AM · edited Mon, 27 January 2025 at 10:38 AM

file_328785.jpg

This object is just 4 Poser primitives with a simple 2D texture applied. It is lit by a single spot light set to white. Why am I getting this funky lined pattern on the side and bottom? 


<strong>bandolin</strong><br />
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bandolin ( ) posted Thu, 23 February 2006 at 10:39 AM

file_328786.jpg

Here is the same object w/o the texture. 


<strong>bandolin</strong><br />
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bandolin ( ) posted Thu, 23 February 2006 at 10:54 AM

file_328787.jpg

This is the texture I'm applying 


<strong>bandolin</strong><br />
[Former 3DS Max forum coordinator]<br />
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bandolin ( ) posted Thu, 23 February 2006 at 10:55 AM

file_328788.jpg

These are a pair of examples with the texture above applied. On the left is a box and on the right is a 1-sided square. This is really bizarre. Something is going on here that I'm not understanding. 


<strong>bandolin</strong><br />
[Former 3DS Max forum coordinator]<br />
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Khai ( ) posted Thu, 23 February 2006 at 10:59 AM

increase your shadowmap size and that should go away.

bandolin ( ) posted Thu, 23 February 2006 at 11:03 AM

file_328789.jpg

Here I adjusted the shadow min bias to 5 instead of the default .8. The problem seems to have gone away. 


<strong>bandolin</strong><br />
[Former 3DS Max forum coordinator]<br />
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<p><em>Caution: just a hobbyist</em></p>

bandolin ( ) posted Thu, 23 February 2006 at 11:06 AM

file_328790.jpg

In this example I increased the Spot Light's Map Size to 512 from 256 as Khai suggested. 


<strong>bandolin</strong><br />
[Former 3DS Max forum coordinator]<br />
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stewer ( ) posted Thu, 23 February 2006 at 12:08 PM

In the case of Poser, which is using mid-point shadow maps, you can also try making your object thicker (as you noticed, the artifacts are stronger on the single plane), that should make things better. Otherwise, you have to deal with shadow bias - it's an unfortunate necessity that comes from the shadow mapping algorithm itself and it present in every program using shadow maps.

LadySythe ( ) posted Thu, 23 February 2006 at 3:32 PM

Oh, another with those render lines. I got those when rendering in Terragen aswell. Its nasty when you have a great pic... I wish I knew how to get rid of those. LS

infinity10 ( ) posted Thu, 23 February 2006 at 8:55 PM

Ooohhh, is that what those lines were... I got them too on my hi-res square, but I figured they looked interesting and used the prop as a sort of textured semi-opaque curtain. So, now I understand more about this. Thank you for asking and answering, Everyone.

Eternal Hobbyist

 

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