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Whats up with perlin noise z scale?

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andyz
Posts: 15
Filters: 5
The z coordinate in get_perlin_noise does not work as expected for me - its scale seems to be way off that of the x & y axis.
Normally with 3d perlin noise I can swap the x & z coordinates and get rougly similar results but in FF lua get_perlin_noise(x,y,0,10) is totally different to get_perlin_noise(0,y,x,10) because everything is stretched horizontally with the latter.
Why is the z scale different?
Posted: August 25, 2014 9:33 am   Details E-Mail
Indigo Ray
Adam

Posts: 1442
Filters: 82
The 4th parameter of get_perlin_noise controls the "scale" of the x and y coordinates, but it does not seem to affect the z coordinate. The noise(0,y,x,scale) is not stretched when the scale is set to 500 or so.
Posted: August 25, 2014 8:51 pm   Details E-Mail
GMM
Moderator
Filter Forge, Inc
Posts: 3491
Andyz, please attach or email a filter that would illustrate your issue.
Posted: August 27, 2014 11:17 am   Details E-Mail
andyz
Posts: 15
Filters: 5
here is simple example

noiseproblem.ffxml
Posted: August 28, 2014 6:02 pm   Details E-Mail
Vladimir Golovin
Administrator
Posts: 3446
Filters: 55
Andyz, yes, the Z coordinate of our perlin noise behaves differently. Our implementation of perlin noise was not intended to provide a full 3D noise. In our 2D adaptation of the Perlin Noise algorithm, the X and Y coordinates are special because the noise must be capable of seamlessly tiling itself along the XY plane, but not in the third dimension. The stretching you see is probably caused by the fact that the Z coordinate is not affected by the scale factor argument.
Posted: September 15, 2014 10:28 am   Details E-Mail
andyz
Posts: 15
Filters: 5
Ok, I am doing something different from the norm (3d noise on a sphere for planets) but I used a LUA implementation of improved perlin noise which is actually very fast!
Posted: September 17, 2014 5:34 am   Details E-Mail

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