This tool allowed users to create detailed technical drawings, and was affordable to many smaller design, engineering, and architecture companies.

Dot products and cross products reveal their geometry, without the need for determinants. For the impatient and aren't we all a little? Frequently 3D graphics uses a 3-tuple, x,y,zwithout concern for whether it represents a vector or a point.

When being more careful, U: The origin is then O: A direction is a vector with length ignored. All lines are ordinary Euclidean lines, not projective oddities like lines at infinity.

U is the minimum squared distance of L from the origin. U is the point of L closest to the origin. V] is the plane through L perpendicular to its origin plane, for non-null V.

N is the point where L intersects plane [N: P] is the plane containing L and point P: N] is the plane containing L and direction N not parallel to L.

Let N, N1, N2 be unit vectors along the coordinate axes, with U. N is a point on L if N is not perpendicular to U. U and this point both satisfy a plane equation [E: Represent L as U and this point to transform by non-perspective homogeneous matrix.

Represent L as two points to transform by perspective homogeneous matrix.

N2] are distinct planes containing L. P satisfies both these plane equations if L contains P. U parameterizes points on L. N2] parameterizes planes through L. Sum positive if right-handed screw takes one into the other; negative if left-handed.

Let N be a unit vector along a coordinate axis, with U1xU2. N is the point of intersection, if any. U2] is the common plane for non-parallel lines. Let N, N1, N2 be unit vectors along the coordinate axes, with U1.

N] is the common plane for parallel distinct lines. N1] is the common plane for equal lines through origin. Here are two related tricks, a lagniappe, as they say in New Orleans. Let P be the point x,y,z.

N and distinct direction vectors ExN1 and ExN2 lie in the plane. In reality, line intersections, parallelism, and various other alignments have vanishingly small probability.

Small perturbations destroy them, and so numerical tests may need the robustness of error bounds.Ada Lovelace, the namesake of the Ada programming language, considered the world’s first computer programmer We left off the previous tutorial at parsing input from a user or a file, so we’re going to address that today.

A user may draw to the basic abstract interfaces, either in C++ code or, more usually, via visualization commands through a user interface, and expect it to be rendered in one of a number of different ways: to a computer screen (graphic drivers) or to a file for subsequent browsing (file-writing drivers).

File name Extensions List.A.B.C.D.E.F.G.H.I.J.K.L.M.N.O.P.Q.R.S.T.U.V.W.X.Y.Z.$$$ Temporary file FAX.2gr A file that. Writing a simple raytracer in Common Lisp Introduction to Iteratees in Scala Saddling the horse with type-classes in Scala Context bounds View bounds: h4 (#1) Restricting a generic function to parameters of a certain type (#2) Having type-classes provide behaviour (#3) Increasing type-safety (possibly adding behaviour) (#1) Implicit conversion.

The largest collection of Hello World programs on the Internet. Add Date: Clojure is a LISP language variant on the JVM. It is more emphasis on pure functional programming than Common Lisp, but provides the status of some of STM tools to deal with the problem it has introduced.

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Scripting - ImageJ