I always wondered why 3D points in OpenGL, Direct3D and in general computer graphics were always represented as (x,y,z,w) (i.e. why do we use four dimensions to represent a 3D point, whatâs the w for?). This representation of coordinates with the extra dimension is know as homogeneous coordinates.
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Compression Couplings. Compression fittings are a way of joining copper pipes or a copper pipe to a fixture where you can't solder or where you may have to take the joint apart in the future. Toilet supply line is a good example.