Fix Uv Without Unwrapping It All Again Blender

When texturing a model in Blender we will often need to work with UV maps. Occasionally nosotros may run into really disruptive issues that tin exist a scrap difficult to solve. Here are the common mistakes that we will cover in this article.

• UV map isn't visible
• The Image Texture Isn't Visible
• The UV Editor Background is white
• UV proportions don't match geometry
• UV Map is overlapping
• Textures are a cord of colors
• UVs are bent

If you are new to UV mapping I suggest that yous check out the ultimate UV mapping guide.

Related content: The definitive tutorial to UV mapping in Blender

Let'south swoop in!

The UV Map isn't visible in the UV Editor

The start problem we'll go over is our UV Maps not showing upwards. In short, check these things outset.

• Make sure nosotros're in edit mode in the 3D viewport by pressing Tab, and brand sure to select all faces you're editing earlier going to the UV Editor
• Enable the show overlays option at the top right of the UV Editor
• Make sure the UV Editor has a Linked Image at the height center

The first solution is to make certain our Mode is Set up to Edit Fashion in the 3D viewport. Nosotros can do this by pressing Tab, or past going to the manner menu in the meridian left corner of the 3D viewport.

Then nosotros'll desire to brand sure all the vertices/edges/faces we desire to modify in the UV Editor are selected, in the example beneath I selected all the faces by pressing A in the 3D viewport or by going to the select menu and choose all.

The next thing we tin do is brand sure that show overlays is enabled in the UV Editor, nosotros'll likewise want to make sure we're in the UV Editing Workspace, or have a window open up with the editor blazon set up to UV Editor.

In previous versions of Blender the UV editor and the Image editor were the same, since 2.8 and forward, the two editors has been separated into 2 different editors and you should utilise the UV editor with any after version.

As yous can see with Overlays disabled we won't be able to see or UV Maps, only when nosotros enable it we'll exist able to encounter our UV Maps.

On occasion Blender won't show our UV maps because there's no active image in the UV editor. If this happens it is most likely a issues. This tin can be stock-still past going to the image driblet down and either select the correct image or going to the file browser and calculation it.

The Image Texture isn't visible in the UV Editor

The next issue nosotros may have is that the image texture nosotros're mapping our UV map onto doesn't bear witness upwards in the UV Editor.

First we demand to empathise that the epitome shown in the background in the UV editor is completely separate from the materials and shaders. It is stand lonely fifty-fifty if Blender tries to choice the correct image sometimes.

We tin manually choose any image to have in the background at whatsoever time from the prototype selector in the header. As long equally the image is loaded into the electric current blendfile.

But click the prototype icon to become a dropdown showing all images available in the blendfile Chanses are that you have already loaded the prototype into your blendfile because you added it to your material in an paradigm texture node.

Related content: The complete beginners guide to Blender nodes, Eevee, Cycles and PBR

Click the binder icon to browse for an existing epitome on your hard drive or printing the new button to create a new paradigm to use equally the background.

The paradigm in the groundwork doesn't take anything to do with the UV map either other than being used as reference. We can utilise the UV map with any epitome texture in the shader editor. In fact, information technology is quite likely that it will exist used by multiple paradigm textures.

The UV Editor background is white

Some other issue we could take is that the background is showing as white, there can exist a couple reasons for this.

This first cause of these may be similar to the Image Texture non being visible, make sure you linked the correct Prototype in the UV Editor.

The second cause of this may be that we take many overlapping faces, while the UV Editor geometry is slightly transparent if nosotros have also many overlapping faces information technology will cause the background to be completely covered.

In this example I've unwrapped an object with a big amount of faces and set all the faces to overlap, as you tin see it results in a white groundwork.

Yous will see this faint edge around the edges indicating the edge of a UV mapped face up. We can map every face on an object in this way by going to the UV map menu in the 3D viewport while in edit mode and cull reset.

The first solution to this is to pack our UVs so that they do not overlap or simply unwrap the UV map again. While this will work in cases where we didn't intend for our UVs to be overlapping we have now inverse the UV map and we may or may not desire that.

This is where the second solution comes in handy, Blender gives us the selection to lower the opacity of the UVs. Go to the overlay menu and lower the UV opacity.

We tin can lower it only enough and so that the background image is visible through all the faces

Keep in listen that we'll probably desire to ready this back to one when we're working with non overlapping UVs as otherwise it tin quite difficult to really see them.

Proportions are not correct between face and uv map

We may besides take bug without our UV maps being incorrectly portioned, in some cases this is simply a scale consequence and in others we may but demand to manually suit the UV maps then that they are the correct proportion.

Before starting to UV unwrap, you lot should make sure that your scale is reset. You can practice this past going to object fashion in the 3D viewport, press Ctrl+A and choose calibration. This is unremarkably called to utilize the scale.

Y'all can read more than about it here:

Related content: How and why do we use scale in Blender?

You can also check if the scale is correct past pressing N to open the right side tool console in the 3D viewport while in object mode and in the detail tab, make certain that the calibration values in the transform section are all fix too 1.0.

In this example we can see that the scale of the object is non uniform since the Z axis is set to a value other than 1.0.

This tin besides be the consequence of an incorrectly unwrapped model, for example we may need to add seams to the model and so that it can be unwrapped correctly.

The UV map is overlapping

Another issue we may see is that our UV maps are overlapping, while this isn't e'er going to exist an issue, if we are for baking a texture we won't want this.

Related content: How to bake textures in Blender

The most simple style to prepare overlapping UV maps is to employ UV map packing. You can find information technology past going to the UV menu and choose pack islands. Some other way is to use the UV packmaster add-on. It is a paid add-on that you can observe here:

External content: Blendermarket - UVpackmaster

Nosotros tin can as well select individual UV islands and utilise the transformation tools to manually adjust the UVs until there is no more overlapping.

Texture is a cord of colors, how to correct it.

Sometimes our UVs will be so stretched that the texture just appears as a string of colors, in this example nosotros will need to unwrap the faces with this event since their uv data isn't set properly.

The best manner to fix this is to unwrap the affected faces. Starting time by selecting the stretched faces in edit mode and come across what the corresponding faces looks similar in the UV editor. Most often they announced as a unmarried thin line. If yous tin't see anything in the UV editor, press A to select everything while the mouse cursor is in the UV editor and press period to zoom the choice into view.

Next, unwrap these faces over again past going to the UV menu in the 3D viewport or by pressing U and choosing an unwrap method. Nearly likely yous would want to use the first option called "unwrap".

This should unwrap all the selected faces within the UV paradigm space.

Related content: How UDIM works in Blender

In this case the curved surface of this model doesn't have proper UVs, to fix that I used the UV Mapping Unwrap to generate working UVs for those faces.

With the affected faces unwrapped we can run across that the texture is at present being mapped properly onto the curved surface.

Note that I've added the red seams to the model to tell Blender how to cutting upwards the surface so that it tin map it onto texture, to add seams to our model modify the selection manner to border, then select the edges y'all'd like to make a seam and and then get to Edge > Marking Seam.

How do you straighten UVs in Blender?

Finally we may desire to straighten our UV Maps, for instance if we were to unwrap a curved surface like a cylinder we may run into the issue where the UV Maps are somewhat distorted, blender does this to minimize stretching merely when we're either trying to conserve UV Infinite or line up our texture seams this tin become an issue.

First nosotros'll desire to straighten the edges of a quad in the UV editor, then we select all the faces in the UV editor we'd similar to straighten, settings the straightened one to Active, and go over to the 3D View and navigate to UV > Follow Active Quad

Now all of the quads in our UVs volition be corrected, note that all of the selected UVs must be quads.

We can also apply the UV squares add-on y'all can find out more virtually it here:

Related content: Artisticrender Blender improver list - UV Squares

Final thoughts

UV Maps can exist a niggling complicated to work with at times, being able to apace solve issues we are having can save usa a lot of time since it may not be obvious at outset what is incorrect, and it tin be a lot easier to narrow downwardly the issue when nosotros have a checklist of fixes to go through.

Thanks for your time.

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Source: https://artisticrender.com/7-uv-mapping-problems-in-blender-and-how-to-solve-them/

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