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Author Topic:  analytic slopes / directional DE  (Read 283 times)

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Offline claude

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analytic slopes / directional DE
« on: September 11, 2019, 08:49:30 PM »
Today I implemented directional DE in KF via derivatives.  The distance estimate is stored internally as a pair of floats, the length of this vector is used for analytic de colouring, and when analytic differences are enabled it is also used for slopes.  This allows jitter to be used (good for Moire reduction) without getting a noisy texture.  See attached examples.

Currently there is only one Differences control, maybe there should be a second toggle for screenbased vs analytic slopes mode?

Doesn't work properly when Guessing is enabled, I was trying to use geometric mean over complex DE but I might have messed up something there.

Should also enable cool stuff to be done with EXR exports, now saved as two channels DEX and DEY.  KF can no longer do anything useful with the DE (single-channel, not directional) EXR files.

The DEX/DEY channels are only saved if derivatives have been calculated, otherwise you can recalculate an approximation in screenspace fom the N+NF channels, so there's no point storing the redundant data.

Reference for directional distance esimate via matrix vector norm: https://fractalforums.org/fractal-image-gallery/18/burning-ship-distance-estimation/647/msg16648#msg16648

Linkback: https://fractalforums.org/index.php?topic=3068.0

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