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3.1.1 Points
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Point ( expression ) = { expression, expression, expression, expression };
Creates an elementary point. The expression inside the parentheses is the point's identification number; the three first expressions inside the braces on the right hand side give the three X, Y and Z coordinates of the point in the three-dimensional Euclidean space; the last expression sets the characteristic mesh length at that point. See Characteristic lengths, for more information about how this characteristic length information is used in the meshing process.
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Physical Point ( expression | char-expression ) = { expression-list };
Creates a physical point. The expression inside the parentheses is the physical point's identification number (if a char-expression is given instead, a unique identification number is automatically created); the expression-list on the right hand side should contain the identification numbers of all the elementary points that need to be grouped inside the physical point.