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3D Vectors Script Author - Mike Williams Email: mrw@netcomuk.co.uk Webpage: Summary: Basic 3D vector functionality. Instructions: This script supports 2 vectors, A and B. A vector is defined using the top 3 stack values in reverse order (z is top of the stack, y is next, then x) - use >A to define A and >B to define B.  A> and B> put the current vector values on the stack. A<>B swaps the values of A and B. All vector operators leave their results on the stack to be then stored or cleared. Binary operators that are are A+B (addition), A-B (subtraction), A.B (dot product) and AxB (cross product). Unary operators are |A| (length), a^ (unit vector, or direction cosines), and s.A (scaling). Clear removes 3 values from the stack as a quick way of removing a vector's values. Code: RPN.2.f+3 \V1.0 - nuff said \V1.1 - test for 0 length in unit vec \V1.2 - fix cross product \Get & put A & B vectors [a]xaxbxc; [b]xdxexf; [x]XcXbXa; [y]XfXeXd; \Duplicate a vector [d]g3g3g3; \Vector functions [l]r32Pr32Pr32P++s; \length [s]g1r5*r2g1r5*r2r4*; \scale [t]r6r4+r5r4+r4r4+; \sum [u]r6r4-r5r4-r4r4-; \difference [v]r6r4*r5r4*r4r4*++; \dot product "3D Vector" "A+B: vector sum" CaCbCt; "A-B: vector difference" CaCbCu; "A.B: vector dot product" CaCbCv; "AxB: vector product" xbxf*xcxe*-xcxd*xaxf*-xaxe*xbxd*-; ~ "|A|: vector length" CaCl; "a^: unit vector" CaClg10=0(d1D'Zero length vector!|OK|'d1:Car4tCs); "s.A: scale vector" ?1Car4Cs; "A<>B: swap vectors" CaCbCxCy; ~ ">A: get A from stack" ?3Cx; ">B: get B from stack" ?3Cy; "A>: put A on stack" Ca; "B>: put B on stack" Cb; ~ "Clear: pop vector values" ?3d1d1d1;