Bake unwraped texture

[alessandro_varini]

Hey there, i need your help cause i’m stuck for a problem. I have to create a label to stick on a bottle, from the bottom to almost the top, then i created a plane picture in illustrator, i putted on a model of a bottle in blender as an image texture, then from here (i need to create seam, probably bake it and get the image i want.

I need to do this thing, i need to embeed a picture to let you understand, look the map in the middle…

i tried to do something but i don’t get the result i want…

Please help me!!!

[RSEhlers]

There are several ways to do this…let me ask you, do you want it to look like a label ie: Beer bottle or water bottle where the texture looks like it is shrink-wrapped onto the bottle something like the painted labels?

If so I think what you need to do if you are going to use the UV map you showed. then you would need to add the texture and then scale the UV so that the label fits…something like this…

Of course, I did a completely different UV from yours with the cylinder projection and a plain UV unwrap with seams…on different parts then scaled and aligned in the UV window…

Another way is to unwrap…the UV map you have is fine…and use projection paint to stick the texture to the bottle. It looks like you want the texture on front and back, so you could use the ortho views to do that…you wouldn’t really need to bake the diffuse texture. for when you have finished the painting you save the image and you are done…of course, it would be nicer to add an HDRI and Bake the diffuse to get a better image…

[alessandro_varini]

yes ok, i get this… but what i shoud make is something a little more complicated… i almost need to do a sort of reverse engeeniring.
Then, from plane picture, i put it on the bottle, modifying the aspect (at the top of the bootle,that is narrow, the image get proportionally correct… From here, i need to export the proportionally correct image to print A4 sheet, for sticking to the bootle…

[RSEhlers]

Ok…I understand…
You are going to have to change the UV so that you have a shape to cut out…so it will need to be a combination of Seams and Scaling…I did a section grab of your image…made up a quick bottle…you will have problems where the curve transitions to the neck. What you are in essence doing is applying the texture then adding the seams and then splitting the bottle and flattening the parts…as done in Paper Modeling…here is a quick test of my set…

I didn’t have enought of the image to get all the UV onto it but the UV would be the edge you cut out and apply to the bottle…I chose to only do half of the bottle but you could stack both sides of the bottle to get the image on to the other side…you don’t want to get too much of the image around the bottle cause it will be difficult to flatten the image around the physical bottle…
Bottle-UV-02.blend (802.3 KB) I did not pack the images…too big…add an hdri and your image

[Stan_Pancakes (Stanislav Blinov)]

@RSEhlers

I did not pack the images…too big…

An offtopic tip - use the Compress option in the Save dialog (click the cog on the top right for it to appear). This can cut down on file size substantially.

[RSEhlers]

Thanks and I do know about it…but 4k HDRI still put it over the limit…and since he had the original texture and I grabbed a screen snip…figured to leave them out…

[alessandro_varini]

Thank you RSEhlers for your attemp… but the problem remains. Is right the top part that i’ve to figure out how to have it plane, without distorsion. What i really have to do is to flatten the bottle… un-roll the curvature of the bottle, or better of a label shrinkwrapped on the bottle… but i don’t know if blender can do something like this.
I have the possibility to try printer that can print an a4 format label, that can be transfered on a glass bottle using an autoclave… then i trying to under stand if i can make a single label to create all the 360 of the bottle…

here you see what it should be the format i want to get.

[StrayBillie (Billie Stray)]

Are you trying to do something like this?

[alessandro_varini]

Yes😁! It looks right what I need to do! but there is something strange about the view of “text”, I need that text or the image texture follow the shape, and then get narrower at the poles of the ball… btw,How is it possible to do this thing with an image texture?

[StrayBillie (Billie Stray)]

Well, tbh, I thought that what you already were doing in the first post…

1. The idea here is to first texture your image however you want (I just unwrapped “from view” for example, but you should probably use cylinder projection as user above demonstrated), use whatever projection you need, chop and unwrap your UV in a way that makes the texture follow the shape, etc…
2. Plug that UVmap into Vector socket of the Image Texture Node, which in turn is plugged into Color of the Shader.
3. Then create a second UV map ("+" in UVmaps tab). Turn on Render icon on that map in the same tab.
   Here I put every vertical seam on the narrowing part and unwrapped.
4. Create new image, plug second map into its Vector. Select that image, set bake settings, bake color. Don’t forget Output > Margin setting.

[RSEhlers]

If you want to use that specific UV…then the only way would be to Projection Paint onto it/bottle…If you add the texture and then bake the Diffuse map…It will always break the image in the petal section of the UV…texture Projection on the Bottle will only paint how it hits the bottle on the UV sections without the gaps in the image…

If you go this route which will get the results you want…then I would separate out the parts of the image to Background/Trees…The rectangular area/ couple…text with alpha background… and you could get superior results…that can then be baked to the diffuse and cut out… 2-minute example with the screengrab image…

messy but pay special attention to the Petal shapes on top…NO skipping of the image leaving blank areas or glitches in text/image…

[alessandro_varini]

in fact, i read too late your comment and the result is this one…

Now i would like to try your method RSEhelers… but i didn’t understand very well how put into practice… My experience in blender is just too little :(, but i will try!

[StrayBillie (Billie Stray)]

yep, those areas you circled controlled by the Margin setting

btw, don’t you need to put similar vertical cuts on the lower narrowing part as well?

[alessandro_varini]

i’ve done it, but i get this stretch anyway…

you said something about Margin setting?
Can be the model of my bottle the problem?

[StrayBillie (Billie Stray)]

hm… i see the seams, but it doesn’t look like you unwrapped with them?

Anyway look under Bake > Output > Margin. Lower this settings and that blurry padding area will be smaller. You probably need a couple of pixels there just in case. Or not.

[alessandro_varini]

Ok my dears, here we are… it looks ok and tomorrow i will try to print it and stick it onto bottle! let’s see the result as soon as possible…
The only little problem i see is that the image looks a little stretched, but with illustrator i fix a little bit the proportion.
(Question) is it better to use the image texture node on the shape of the bottle or use a plane shrinkwrapped around the bottle?

[RSEhlers]

Yes…the Margin adds a texture blend outside of the UV edge …in your case…I would set the margin to zero to get the sharp edge for cutting the image out…

??Why is your text/image reversed? WYSIWYG when you print this…

Here is my favorite video on Projection Painting/extraction…You could also search CGBoost on Youtube for another series which is also good!

Blender 2.8 Texture extraction projection painting (part 1)