From adc93f6097615f16d57e8a24a256302f2144ec4e Mon Sep 17 00:00:00 2001 From: rsc Date: Fri, 14 Jan 2005 17:37:50 +0000 Subject: cut out the html - they're going to cause diffing problems. --- man/man3/arith3.html | 216 --------------------------------------------------- 1 file changed, 216 deletions(-) delete mode 100644 man/man3/arith3.html (limited to 'man/man3/arith3.html') diff --git a/man/man3/arith3.html b/man/man3/arith3.html deleted file mode 100644 index 71cf815c..00000000 --- a/man/man3/arith3.html +++ /dev/null @@ -1,216 +0,0 @@ - -arith3(3) - Plan 9 from User Space - - - - -
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ARITH3(3)ARITH3(3) -
-
-

NAME
- -
- - add3, sub3, neg3, div3, mul3, eqpt3, closept3, dot3, cross3, len3, - dist3, unit3, midpt3, lerp3, reflect3, nearseg3, pldist3, vdiv3, - vrem3, pn2f3, ppp2f3, fff2p3, pdiv4, add4, sub4 – operations on - 3-d points and planes
- -
-

SYNOPSIS
- -
- - -
- - #include <draw.h> -
- - #include <geometry.h> -
- - Point3 add3(Point3 a, Point3 b) -
- - Point3 sub3(Point3 a, Point3 b) -
- - Point3 neg3(Point3 a) -
- - Point3 div3(Point3 a, double b) -
- - Point3 mul3(Point3 a, double b) -
- - int eqpt3(Point3 p, Point3 q) -
- - int closept3(Point3 p, Point3 q, double eps) -
- - double dot3(Point3 p, Point3 q) -
- - Point3 cross3(Point3 p, Point3 q) -
- - double len3(Point3 p) -
- - double dist3(Point3 p, Point3 q) -
- - Point3 unit3(Point3 p) -
- - Point3 midpt3(Point3 p, Point3 q) -
- - Point3 lerp3(Point3 p, Point3 q, double alpha) -
- - Point3 reflect3(Point3 p, Point3 p0, Point3 p1) -
- - Point3 nearseg3(Point3 p0, Point3 p1, Point3 testp) -
- - double pldist3(Point3 p, Point3 p0, Point3 p1) -
- - double vdiv3(Point3 a, Point3 b) -
- - Point3 vrem3(Point3 a, Point3 b) -
- - Point3 pn2f3(Point3 p, Point3 n) -
- - Point3 ppp2f3(Point3 p0, Point3 p1, Point3 p2) -
- - Point3 fff2p3(Point3 f0, Point3 f1, Point3 f2) -
- - Point3 pdiv4(Point3 a) -
- - Point3 add4(Point3 a, Point3 b) -
- - Point3 sub4(Point3 a, Point3 b)
- -
-

DESCRIPTION
- -
- - These routines do arithmetic on points and planes in affine or - projective 3-space. Type Point3 is
- -
- - typedef struct Point3 Point3;
- struct Point3{
- -
- - double x, y, z, w;
- -
- };
- -
- - -
- Routines whose names end in 3 operate on vectors or ordinary points - in affine 3-space, represented by their Euclidean (x,y,z) coordinates. - (They assume w=1 in their arguments, and set w=1 in their results.)
- Name       Description
- add3       Add the coordinates of two points.
- sub3       Subtract coordinates of two points.
- neg3       Negate the coordinates of a point.
- mul3       Multiply coordinates by a scalar.
- div3       Divide coordinates by a scalar.
- eqpt3      Test two points for exact equality.
- closept3   Is the distance between two points smaller than eps?
- dot3       Dot product.
- cross3     Cross product.
- len3       Distance to the origin.
- dist3      Distance between two points.
- unit3      A unit vector parallel to p.
- midpt3     The midpoint of line segment pq.
- lerp3      Linear interpolation between p and q.
- reflect3   The reflection of point p in the segment joining p0 and - p1.
- nearseg3   The closest point to testp on segment p0 p1.
- pldist3    The distance from p to segment p0 p1.
- vdiv3      Vector divide -- the length of the component of a parallel - to b, in units of the length of b.
- vrem3      Vector remainder -- the component of a perpendicular to b. - Ignoring roundoff, we have eqpt3(add3(mul3(b, vdiv3(a, b)), vrem3(a, - b)), a). -
- - The following routines convert amongst various representations - of points and planes. Planes are represented identically to points, - by duality; a point p is on a plane q whenever p.x*q.x+p.y*q.y+p.z*q.z+p.w*q.w=0. - Although when dealing with affine points we assume p.w=1, we can’t - make the same - assumption for planes. The names of these routines are extra-cryptic. - They contain an f (for ‘face’) to indicate a plane, p for a point - and n for a normal vector. The number 2 abbreviates the word ‘to.’ - The number 3 reminds us, as before, that we’re dealing with affine - points. Thus pn2f3 takes a point and a normal - vector and returns the corresponding plane.
- Name       Description
- pn2f3      Compute the plane passing through p with normal n.
- ppp2f3     Compute the plane passing through three points.
- fff2p3     Compute the intersection point of three planes. -
- - The names of the following routines end in 4 because they operate - on points in projective 4-space, represented by their homogeneous - coordinates.
- pdiv4Perspective division. Divide p.w into p’s coordinates, converting - to affine coordinates. If p.w is zero, the result is the same - as the argument.
- add4   Add the coordinates of two points.
- sub4   Subtract the coordinates of two points.
- -
-

SOURCE
- -
- - /usr/local/plan9/src/libgeometry
- -
-

SEE ALSO
- -
- - matrix(3)
- -
- -

 -
-
- - -
-
-
-Space Glenda -
-
- - -- cgit v1.2.3