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OBJ files typically contain vertex positions, texture coordinates (also known as UVs), and normals, as well as face data. There are other kinds of things they can contain but those are the most common (see here for a fuller specification). Vertex positions are specified with the v command, texture coordinates with vt, and normals with vn. The faces then ...


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If you look closely at the edge of the sphere, in the first image it is sharp, and in the second image it's blurry, blending into the background color. This suggests to me that it's not the texture, but the ray distribution on the image plane that's the issue. The second image might be distributing rays over a larger area per pixel, for instance by using a ...


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Minification vs magnification is an extension of mipmap selection. When you calculate the desired mip level, it can come out to be less than 0 (or in general, less than the sampler's configured minimum LOD). In that case you're doing magnification of the lowest mip level. If the desired level comes out to a value greater than 0 then you're doing minification....


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