# Texture Coordinate vs Geometry Node

When working with generated texture coordinates I see sometimes the Texture Coordinate (generated) and sometimes the Geometry (Position) node used. What is exactly the difference ?

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Geometry position is almost certainly the (X,Y,Z) coordinate of the surface (or interior) point that is to be coloured/textured etc. as part of the render. Texture Coordinate defines what is to be used for the (U,V) coordinate used to lookup a position on the UV Map and use the pixel information found at that point as the source for the rendered pixel (or the onward journey through node graph). link – PaulMc Jan 18 at 14:52

The Generated and Position outputs each represent coordinate systems. These are often used as texture coordinates for procedural textures since they are 3-dimensional, though they can be useful for other effects as well.

## Generated Texture Coordinates

Generated coordinates are defined by the bounding box of an object, and are unique to each object.

Generated texture coordinates give the bounding-box-space position across the mesh. The bottom, left, front of the bounding box is the origin (coordinates `[0, 0, 0]`), and the top, right, back of the bounding box is `[1, 1, 1]`.

I use generated coordinates when I need the texturing to transform, particularly rotate, with the object. However when the bounding box is significantly non-cuboidal generated textures will stretch and distort the texturing. In these cases you may need to manually "un-stretch" the texture with a mapping node, or use Position coordinates.

Generated coordinates can also be useful for non-texturing methods, like creating gradients or other more advanced techniques.

## Position Coordinates

The Geometry > Position output gives the position in world-space across the object. The origin (`[0, 0, 0]`) is the world origin and all other points are simply their respective position in Blender Units relative to the origin.

I like to use Position coordinates to keep uniform texture scaling across with a material assigned to multiple objects with different sized bounding boxes. Using Position coordinates also prevents distorted stretching on objects with significantly non-cuboidal bounding boxes.

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I would say it does not matter too much in practical situations to use the one or the other. Or are there situations that it matters which node you use ? – Old Man Jan 18 at 18:52
@JanScherders See edit. – PGmath Jan 18 at 19:11
thanks for your edit. It really adds value – Old Man Jan 18 at 21:19