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Ramlyn
Ramlyn
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This a problem that was said also other times. When rotating something of exactly 45, 135, 225 and 315 degree, strange lines appear.
This is a letter T, made with polygons. Rotating it of different values, nothing happens. It appears correctly.  |
| Posted: February 27, 2021 1:35 am |
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Ramlyn
Ramlyn
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But if I rotate it of135 degree.....  |
| Posted: February 27, 2021 1:36 am |
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Ramlyn
Ramlyn
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As sometimes it was suggested, I work on the Anti-Aliasing.
But even increasing to 65 Samples and All Pixels.....  |
| Posted: February 27, 2021 1:38 am |
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Ramlyn
Ramlyn
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The turn around solution is increasing or decreasing the rotation angle of a small value.
Then the lines don't appear anymore.  |
| Posted: February 27, 2021 1:41 am |
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Ramlyn
Ramlyn
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Anyway, it would be better to solve the problem, I think.
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| Posted: February 27, 2021 1:42 am |
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SpaceRay
SpaceRay
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Ramlyn wrote:
The turn around solution is increasing or decreasing the rotation angle of a small value. |
So, to make it more clear, if I understand it right, it happens only with 135 degrees, and with 134 or 136 degrees it works correctly, or what amount of degrees you need so it is removed?
maybe you could put the filter here so other can test it too.
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Ramlyn wrote:
Anyway, it would be better to solve the problem, I think. |
Yes, I too that it would be better to solve it if it possible.
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| Posted: February 27, 2021 12:28 pm |
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Ramlyn
Ramlyn
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SpaceRay wrote:
So, to make it more clear, if I understand it right, it happens only with 135 degrees, and with 134 or 136 degrees it works correctly, or what amount of degrees you need so it is removed? |
Even 0.01 degree is ok.
You just need to move from exactly 45, 135, 225 and 315 degree.
It is easy to see even in a simple filter.
Make two adjacent squares. Add a different color background. Then use Rotate to turn them of 45, 135, 225 and 315 degree.
You should be able to see the problem.
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| Posted: February 28, 2021 12:38 am |
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Rachel Duim
So Called Tortured Artist
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I have dealt with this issue for a long time. It really is not fixable given that pixels are generally used as squares. Any software or program that rotates at exactly 45 degrees etc etc is going to have to deal with the triangular result, which will require anti-aliasing to look "correct". So a level of approximation is added by the rotate that can not be ignored. Like the gaps you are seeing, I have had this issue since the wallpaper filters.
It is "kludge-able" however. Your method works, but I prefer to take the "seed" shape that I'm going to rotate and Scale it slightly larger with center set appropriately. Experiment, it seems that values like 1.001 or 1.0001 work for the scale factor. At least for me, messing with the angles even a little I can see the difference. My 2 cents... Math meets art meets psychedelia. |
| Posted: February 28, 2021 3:32 pm |
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Ramlyn
Ramlyn
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Rachel Duim wrote:
It is "kludge-able" however. Your method works, but I prefer to take the "seed" shape that I'm going to rotate and Scale it slightly larger with center set appropriately. Experiment, it seems that values like 1.001 or 1.0001 work for the scale factor. At least for me, messing with the angles even a little I can see the difference. My 2 cents... |
Thank you! Yes, your idea is good too.
We need to remember of this problem when we make filters.
Because it can compromise the results.
I think I will probably have to check if some of my previous filters are ok too.
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| Posted: March 2, 2021 11:46 pm |
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