After a UV map is generated, the artist adjusts and optimises it to minimise seams and overlaps. Once the model is unwrapped, the artist can paint a texture on each triangle individually, using the unwrapped mesh as a template.Ī UV map can either be generated automatically by the 3D application, be made manually by the artist, or by some combination of both techniques. For example, if the mesh is a UV sphere, the modeller might transform it into an equirectangular projection. One way is for the 3D modeller to unfold the triangle mesh at the seams, automatically laying out the triangles on a flat page. When an artist creates a model using the polygonal modelling method, with a 3D modeller like Wings 3D or Blender, UV coordinates are generated for each vertex in the mesh.
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The rendering computation uses the UV texture coordinates to determine how to paint the three-dimensional surface. UV is the alternative to XY it only maps onto a texture space, rather than into the geometric space of the object. The UV mapping process involves assigning pixels in the image to surface mappings on the polygon. The resulting coloured image is called a UV texture map. UV texturing allows for the colouring of polygons that make up a 3D object. Therefore, the term ‘UV coordinates’ describes how a texture is mapped onto a 3D object. As opposed to the X, Y and Z coordinates (the coordinates for the original 3D object in the modelling space), a different set of coordinates is used to describe the surface of the mesh, denoted by the letters U and V. The process of UV mapping is normally used for texturing 3D models it ‘projects’ a texture map onto the 3D object. UV mapping is the procedure of making a 2D image representation of a 3D model. UV mapping and texturing will make it aesthetically more appealing, as we will see. If you were to render the plane’s model without applying such colouring, it would seem pretty drab. Why is texturing of a model important? Obviously, a black-and-white rendered outline of a model is far less appealing to the eye than a picture rendered with colour combinations and texturing. This article continues from the previous one in which we dealt with modelling an airplane. Here we look at UV mapping - making a 2D image of the 3D model.
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