Musgrave + OSL unpredictable behaviour

Archive User Feedback
1

I’ve found a problem with Musgrave texture when using OSL and I don’t know if this qualifies for a bug report.

Steps to reproduce:
1: Enable OSL support.
2. For default cube create new material, add Musgrave Texture, preview it.
3. Change Texture Detail over 15, and Lacunarity over 3.780.
The result should look like the one on the right:

2020-06-08-20;07;49
2020-06-08-20;07;491300×1118 291 KB

4. For comparison disable OSL.

Tested with Blender releases:
2.83
2.90 June 01 1d4bae856690
2.90 June 07 281319653e5b

2

You can report it as a bug. In general detail with such high values is not particularly useful, it’s just going to make rendering slower while adding more detail that’s too small to be visible or even representable as a float. Probably we’ll internally clamp the detail to avoid this problem.

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3

Thank you. It’s done.

4

Note that OSL is applying analytic antialiasing to shaders. It will automatically suppress details smaller than the Nyqist limit.

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