Displacement map geometry artifacts

# 1 30-07-2012 , 08:35 PM

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I'm creating a 150 frame animation which includes a ground using displacement mapping. Some frames are how I want but many show strange artifacts.

Below are a small segment (frame 4-7) of the animation where the artifacts are worse. Note frame 4 and 7 are unaffected.

I’m rendering in mentalray, FG is off and I’m only using raytracing. The material is a lambert with a displacement map connected. The lighting is 3 point lights.

The problem arises as soon as I add the displacement to the material.

I'm really stumped on this one. Any help will be appreciated!

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# 2 30-07-2012 , 08:51 PM

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could be that you clicked view dependant in th emental ray approx. editor....

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# 3 30-07-2012 , 08:52 PM

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How did you create the displacement map, could you not get a way with a bump map..............dave

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# 4 30-07-2012 , 09:20 PM

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I haven't touched the approx. editor for this project. I tried to change the view dependent setting but nothing changes. I made a lambert, gave it a texture and added to the displacement field in the shader group a displacement 'file'.

I just noticed that without using displacement the texture blurs at some frames.

Has this something to do with the camera?

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# 5 30-07-2012 , 09:58 PM

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Ok, I found out that 'Shake' option for the camera was causing the issue. The displacement mapping doesn't have artifacts anymore. However I'm not sure why the shake option would do this.

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# 6 31-07-2012 , 08:23 AM

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wow I guess it's because I am getting old and my eye sight is not what it used to be but I cannot see any difference in the first four frames you posted 4-7

and then the next four frames are so dark I cannot make out any details in them.

It sounds like you have it figured out though so good on you.

"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675

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# 7 31-07-2012 , 09:12 AM

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If you save the linked images and flip through them on an image viewing application the difference is quite clear.

The camera shake was the last thing I suspected would be the problem. I used an expression instead to do the camera shake but the results aren't as good. I would still like to able to use 'shake' for this project but I noticed it was the cause of artifacts and texture warping in another project too. Please help if someone knows how to fix this.

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