On the inside of the candle you can see this square which does not blend nicely. I have tried recalculating, remove and add subsurf with different view/render settings. Only thing that i see change is that the square get’s lighter or darker with different renders but can’t seem to get rid of it.
Possibly it’s just because of the way i modeled it? It started as a tube and in edit view i can see all vertices nicely aligned, no irregularities.
Thnx in advance!
Did you flip the normals ctrl-n? (or is that what you mean by “recalculated?”)
Hi NRS,
With recalculating i mean the recalculate button on the tool menu in blender 2.5 (Normals -> Recalculate), flip direction is there as well. I tried your crtl-n suggestion, thnx for that, but i don’t see any changes. I started on a new tube and up to now it does not show this problem with basically the same modeling and subsurf/smooth applied.
I guess i’ll end up throwing away the old one.
Knowing why this happens would be very nice, but i noticed that an accidental Noob keystroke somewhere in the process can easily set you off in the direction of trouble where it is difficult to track-back what’s actually wrong.
Well, hey, it’s good practice, just make another one and better watch what your doing 
This is the result (for now)
Time to un-render my head 
Hi,
A few things you could check for next time are:
Are there any internal faces? Subsurf and shading don’t like internal faces and you can often get issues.
Are there any duplicated vertices taking up the same or similar positions. Again that can confuse Blender. Try removing doubles from the special menu.
Sometimes you have to recalculate normals for only certain faces. In the display options of your 3d window, you can cause the normals to be displayed (as blue lines shooting out of each face in the direction of the normal). This allows you to manually go through and adjust normals as needed.
Sometimes, the human mind can outperform the automated functions. Sometimes…
Thnx AI and benu for the feedback.
What i indeed found was that i had ‘limit selection to visible’ selected in edit mode. So i did not see the extra faces inside the candle, a whole bunch of em in fact. That did solve it.
Thnx again!
That’s nice. Are you going to animate it with a flame? If so, I’d like to know your approach. With procedural textures or particles? I am trying to animate a hand lighting an old fashioned oil lamp and can" seem to get the flame to look right.
Hi Jetplane,
Not sure. Was not planing on animating this one and if i would i can add that my animation knowledge is far from sufficient to be able to actually make choices on an approach. I did create a flame once in a tutorial and that was a ‘halo’ textured sphere. We’ll it was more of a flame area glow than a flame.
From what i have been reading so far i guess i would look into particles. As soon as i will i’ll share my experience with it