Sharandra
 |
If set to Electricity with a scale of 0, the Perlin noise shows nasty seams.
And not just in the preview. Hours of work wasted.   |
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| Posted: March 24, 2013 7:49 pm | ||
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Vladimir Golovin
Administrator |
This is due to our method of making Perlin seamless (we edge-blend octaves individually before blending them together). If you look closely, these seams are visible at any scale as reduced dynamic range at the edges, especially if you use a custom profile curve.
To fix, try to increase Scale / Roughness. |
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| Posted: March 25, 2013 5:49 am | ||
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Sharandra
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Hmm well, no offence, but your method obviously fails in this case, because that is not what I´d call seamless.:S
Roughness doesn´t have any effect on the seams and increasing scale neither, because I need it at a small scale and they only become less noticeable at a fairly big scale. At least I know now where they come from. I would have never suspected the innocent Perlin Noise to be the cause of this.  |
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| Posted: March 25, 2013 11:42 am | ||
Indigo Ray
 |
Is this related? If you take the derivative of perlin noise, you get these weird boxes. This occurs w/ and w/o "seamless tiling" checked. The boxes rotate with "angle" of the perlin noise.
Perlin Boxes Bug.ffxml |
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| Posted: March 25, 2013 11:45 am | ||
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Indigo Ray
|
see here
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| Posted: March 25, 2013 11:46 am | ||
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Vladimir Golovin
Administrator |
Indigo, this is another artifact inherent to Perlin noise. In our implementation it appears relatively rarely, while our first implementations had it all over the place. We consulted with Ken Perlin and he advised us to use a domain rotation trick, which we built into FF1.0. The cubing still appears sometimes, and the only way to minimize it is to tweak the variation setting, which affects the internal 3D rotation of Perlin octaves before they are sliced into 2D.
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| Posted: March 26, 2013 10:39 am | ||
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