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UV for square

I have disorted square, that that fill ground lying in camera view. It should be image that will have more details close to camera. When i shorten edge close to camera UV starts to create triangles that are not visible in UV editor. Cutting plane to tris does not help. Best effect gives subdivision of plane (but there are still some small disortions)

Is there any smart way to do that?

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  • $\begingroup$ "It should be image that will have more details close to camera" I don't see any reason to do that. It's usually best to have texel density same for all visible areas of meshes, so I would either reunwrap the plane after scaling the edge down, cut the plane with knife instead of scaling edge or leave it as is and have half of it invisible to camera $\endgroup$ – Mr Zak Apr 25 '19 at 13:35
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Unfortunately, I don't believe there is any way to do this in blender via UV unwrapping.

The way all 3D programs calculate 4 sided quads is to split them into triangles.

As you scale it, blender is automatically triangulating the four sided quad so it creates a diagonal split along the face in a preferred angle depending on which direction you move the vertices (it changes depending on the algorithm blender uses).

Therefore one triangle will maintain its scale and the other will be distorted as you scale the bottom edge of one of the triangles (which don't appear to be visible until you start scaling because there is no visible edge separating them).

I suggest two methods. You could either bake your image using your subdivided version to use for your image texture for your 4 sided quad or you could use GIMP or photoshop and morph the image along the bottom edge, using the tools there and you could export your UV map template as another layer to use to help line it up.

Like this:

enter image description here

Blend file: https://www.dropbox.com/s/rmifrinjqmc34ba/UV%20plane%20stretching.blend?dl=0

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