Volumetric scaterring

[studiodg]

Hello,
I use Volumetric scattering,
on simple volumes work but on an extruded curve I don't have the same result

I have a transparent result with dark edges but on an extruded curve, everything is dark

Thank you for you help

[romullus]

Did you check if the normals are facing in the right direction, i.e. outwards, not inwards?

[studiodg]

Sorry i don't know, How to change the direction facing ?

Thank you

[romullus]

The easiest way is to add normal modifier to the object and make sure that flip normals is checked on.

[pokoy]

As Romullus said, this might be a normal problem, but could it be that the object has overlapping faces? Maybe the spline it was extruded from has multiple splines all in the same place?

[maru]

I guess it's either flipped normals or the object elements are not welded (some unwelded faces).

[studiodg]

Yes,
I created an arc then I extruded. Now I have several faces. how to render in one face?

Thank you

[studiodg]

I found thanks. I only had one face. My extruded shape was not closed...
 Thank you because thanks to you I tried a lot of manipulation on my shape and not on the texture.
 Thanks for your help :D

[maru]

The Shell modifier could be also useful here (it turns one-sided geometry into solid geometry by adding thickness).