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tok
PostPosted: Thu Jul 12, 2007 10:05 am 
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Location: Hamburg / Ger
An issue concerning a pretty simple material. In order to achieve an uneven wall without repetitive patterns I created an mxm containing only one BDSF, Reflectance white (210), just this bump map (only larger, 2048 x 2048 size, bump 50.000)

Image

scaled the material via Sketchup to 10 m x 10 m, applied it to the model in Studio and selected a resolution of 5120 x 3840. The preview looks ok,

Image

but the render shows patterns that the material does not contain:

Image

What's that?

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Fernando Tella
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PostPosted: Thu Jul 12, 2007 10:14 am 
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Location: Madrid
The pixels of your bump map? (Wild guess) That is how a 2048 pixels image would look if resized to 5120.

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Last edited by Fernando Tella on Thu Jul 12, 2007 10:30 am, edited 1 time in total.

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Tea_Bag
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PostPosted: Thu Jul 12, 2007 10:23 am 
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Joined: Sat Nov 26, 2005 11:12 am
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Hey,

This might also help :wink:

http://www.maxwellrender.com/forum/view ... highlight=

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tok
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PostPosted: Thu Jul 12, 2007 11:04 am 
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Here is a detail of the original bump: 250 x 250, absolutely smooth.

Image

The strange silky patterns are produced by Maxwell, I am afraid. Any chance to avoid them?

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zoppo
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PostPosted: Thu Jul 12, 2007 11:33 am 
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Location: München
50 is quite a high value and nl is warning in the manual not to use them.
have you tried lowering it?

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tom
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PostPosted: Thu Jul 12, 2007 11:47 am 
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tok, email me your map and let me fix it for you. ;)

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tom
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PostPosted: Thu Jul 12, 2007 12:54 pm 
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OK, and here's the video of solution for everyone ;)

THINK! ABOUT IT

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Last edited by tom on Fri Jul 13, 2007 4:56 pm, edited 1 time in total.

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KurtS
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PostPosted: Thu Jul 12, 2007 1:59 pm 
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very good turorial, Tom. In what file format did you save the 16-bit map?
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tom
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PostPosted: Thu Jul 12, 2007 2:08 pm 
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Thanks Kurt! :)

As you may also verify from the manual page 21, only PNG and TIF allows saving 16 bit among supported formats. Personally, I always prefer PNG.

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tok
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PostPosted: Thu Jul 12, 2007 2:15 pm 
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Great! Thanks a lot, Tom!

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sandykoufax
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PostPosted: Thu Jul 12, 2007 2:20 pm 
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Joined: Sat Jun 18, 2005 7:26 am
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Location: Seoul, Korea
Very nice tip.

thank you master. :D

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Bubbaloo
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PostPosted: Thu Jul 12, 2007 3:41 pm 
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Joined: Sat Feb 24, 2007 11:50 pm
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Location: Tulsa, Oklahoma
Your knowledge is vast. Thanks for sharing some of it!

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rshanks
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PostPosted: Sat Jul 14, 2007 5:45 am 

Joined: Mon Aug 07, 2006 12:45 am
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Thanks Tom! :D Good info in the video and great solution for no audio

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simmsimaging
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PostPosted: Sat Jul 14, 2007 7:20 am 
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Thanks Tom - that helps a lot! Very clever use of Wordpad :)

b

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tom
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PostPosted: Sat Jul 14, 2007 9:42 am 
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Very nice to hear it worked :D ;)

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