An attempt for a flame, using a blob container. Some dots appear on the surface:
known bug?

Also: In the doc at "3.4.7.5 Area Lights" it is explained that, with 'circular',
area_lights can be elliptical if x and y axis are not equal. It seems that if I
make so, the thickness of the soft shadows are of the same thickness in all
directions. In this test scene I tried y=5*x, but the soft shadow of the sphere
on the left is even all around. Is this the effect of 'orient'? What did I miss?

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