>> I have literally no idea what you're talking about. Are you using a
>> different release version to me or something? I have no problems here.
>
> 3.7 official.
>
> The attached shows artifacts present at various accuracies for the function
> sqrt(x*x+y*y+z*z)-1. max_gradient set to 100 for all spheres, which is more than
> enough.
>
> The first might look acceptable... but just try adding a pattern displacement,
> and it'll become obvious that the accuracy is set too high.

Assuming you've got no pattern displacement in any of those images, it 
looks to me like it's something to do with the shadow ray being started 
too close to the surface (and hence the tracer immediately thinks the 
shadow ray has been blocked by the isosurface itself).

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