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I just noticed that a black-white gradient used as opacity, is only applied on the external surface of a tube, not on the complete object (volume).
As you can see in the red area, the inner surface of the tube is not affected.
Is there a way to bypass this issue ?
I made a rendering until the end.
We can observe it kinda works on external surface, but :
A - inner surface is not affected by opacity gradient
B - upper surface is completely visible when opacity should be 0%
Thank you for technical feedback.
I am not confusing. If you look closely the first screen capture the inner surface (circled in red) should act as the outter one (in green), as the opacity gradient is applied on the entiere object.
My objective is to get a fading object (from 100% to 0% at the top).
Then the upper surface should completely disappear.
About Blender, I started looking at it.. but their dimension's management is such a pain…
Resolving your issue depends on how the model is unwrapped. If the inner and the outer surfaces share the same UV location (not normally good practice but could be useful in this instance) then a single gradient would work, if they do not then a separate gradient would be needed on each part of the UV map.
You said , "About Blender, I started looking at it.. but their dimension's management is such a pain…"
What problem are you having with it? I use Blender a lot and have never had an issue with dimensions. Just set the units to real world units and go.