Cylindrical Mapping Error

[frip51]

Hey there,
when applying cylindrical mapping to an object, I get strange results at the texture seam. The artefacts are especially strong when both surface seam and texture seam are in the same position. It looks like the texture file is repeated and compressed...
I've come across this error several times and couldn't find the reason, nor fix it.
Anyway, here's an image that illustrates my problem pretty well (whatever this object might be ):




Can somebody help, please?

Cheers,
Matthias

[jeanat9]

Re: Cylindrical Mapping Error

Can't you just shoot it from the other side? Moving your scene around but not the object avoiding the error. Otherwise move your map around see what comes out or depending on the size of the image shrink it. the render is also way over exposed.
gd luck jean

[fpedrogo]

Re: Cylindrical Mapping Error

enable the mapping widget and rotate the cylindrical mapping to have the seam line in the back of the model

[-Keith]

Re: Cylindrical Mapping Error

You could also just correct this in post processing. That might be the fastest solution.

[Micha_cg]

Re: Cylindrical Mapping Error

Is it on the bug list now?

Workaround: if the viewport show it right, than extract the rendermesh, export as OBJ and reimport it again. Now the mapping is burned in the mesh and VfR can't destroy it. Worked for me in the past.

[frip51]

Re: Cylindrical Mapping Error

Thx guys,
the point with rotating the mapping widget is, that the error around the seam area is still there. only the effect is less.

I did not show you guys what I'm actually doing, since it's confidential - but I can tell you that it's about applying several artworks to a product surface, needing to be analysed from every angle possible. Imagine the silly work of rotating scene, mapping widget and/or mapping offset in the process.

@Micha: this is the workaround solution! once it's done, no more issues! thanks a million!
Who is going to put it onto the bug list?

Cheers,
Matthias


PS: @jeanat9: don't worry 'bout exposure I turned off GI map, physical camera, floor layer and spot lighting. That merely to clean the image of disturbing/distractive details and not to win a Render contest here

[Micha_cg]

Re: Cylindrical Mapping Error

@Micha: this is the workaround solution! once it's done, no more issues! thanks a million!
Who is going to put it onto the bug list?

I sent it to the bug list today. It should be there, since the problem is discussed years before:

http://forum.asgvis.com/index.php?topic=4245.0

[frip51]

Re: Cylindrical Mapping Error

ah, brilliant!
thx again!

[matus.nedecky]

Re: Cylindrical Mapping Error

Oh god, it's not bug... it's there because of BOX mapping, Try Cylinder or Surface mapping, it will solve this issue. The very same problem I tried to solve here:

And it was good way.

[frip51]

Re: Cylindrical Mapping Error

Well, for some reason you might HAVE to apply a specific type of mapping.
And this should do its job, if you ask me.
If you read carefully, I applied cylindrical mapping. Surely, this is not meant to be - therefore it IS a bug.


By the way (and this is the main reason for my disinterment of this thread), I just encountered that using a PNG image can make things even worse, if it was created out of a leyered Photoshop file that hadn't been flattened before the save. The PNG is then being saved as if it contained transparency information which causes different problems, as we already know.
So, Photoshop's Flatten Image function has just become somewhat important.

Cheers,
Matt