| | MAY 20218Vantage Point By By- BipinDama, Founder and CEO,Saras 3D, IncFoundationINTRODUCTIONA breath-taking painting by our own MF Hussain or by Mi-chel Angelo has two dimensions. The length and width. The canvass doesn't support the depth, but some of the paint-ings may give a perception of depth. And this perception of depth is different from the objects you see coming out of the screen in 3D movies. But why am I comparing mov-ies and still pictures? Well, the movie, as the name implies, is nothing but a fast-moving string of nearly identical still pictures projected on our eyes such that we perceive a con-tinuously moving `movie' if the speed is at least 16 pictures per seconds. They are called `Frames' in Television par-lance. Before further complicating the matter, we define here the objects and their dimensions.OBJECTS AND THEIR DIMENSIONSAn object is called a point, if the dimensions are very small. Like a Full stop dot `.'. But we know the modern day instru-ments are so powerful that this dot's diameter is also mea-surable. All-pervading Coronavirus has a size of 120 to 140 nano meter (1 nano meter is 0.000 000 001 meter) with a shape of a disk or a kidney. And they have spikes which are 20 nm long. But these are huge compared to the electrons having a radius of 2.82x10-15 m (or 2.82 Femto meter-fm). So practically, nothing is dimensionless as such.On the other hand, a line, or a series of closely placed dots, can be defined by the length or the distance. Hence it is unidimensional or 1D. Note that a line does have a finite width but for all practical purposes, it is ignored. So, the unit `meter' with necessary prefix (like nano, micro, kilo, mega etc) is sufficient to describe a line. A square, on the other hand, has both length and width, thus giving an area. Meter squared (m2) is the unit and it is two Dimensional. A cube has length, width and height. It occupies a volume whose measure is Meter cube (m3). A cube is drawn on a flat, 2D, paper or a computer screen like this:Here, we can see three of six sides of the cube. Length, height and depth. This cube can be rotated on any axis. But can be moved sideways or up and down, not out of the screen. This is not a true 3D. Technically, it is called `Monoscopic 3D', that is, a 3D object viewed with one of the eyes closed.Depth is perceived by the brain when we see an object with both the eyes, that is Stereoscopic 3D. Our eyes are about 65mm apart. Hence an object about an arms length far, will be seen at different angles by each eye. Our brain processes this and gives us the perception of depth, or dis-YEH 2D - 3D KYAHAI?(WHAT'S THIS NOISE ABOUT 2D-3D?)(Demystifying pictures, dimensions and depth perception)Are there any more dimensions? Yes. As if the theory of relativity was not complicated enough, Albert Einstein said that Time is the fourth dimension. But then Hermann Minkowski (1864-1909) linked space and time and coined the word spacetime which Einstein reluctantly agreed and Tensor mathematics was developed. But all these are beyond the scope of this blog and found a mention here just to ignite your minds.
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