VS:NurbsSurfaceEvalPt/ja

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.VectorScript|VectorScript ..VS:Function Reference|Function Reference ..VS:Function_Reference_Appendix|Appendix


Description

ハンドルで指定したNURBS曲面上の結び目u,vの座標を返します。
PROCEDURE NurbsSurfaceEvalPt(
objectHd  :HANDLE;
u  :REAL;
v  :REAL;
VAR p  :POINT3D);
def vs.NurbsSurfaceEvalPt(objectHd, u, v):
    return p

Parameters

objectHd HANDLE NURBS曲面のハンドル
u REAL U方向上の結び目の値
v REAL V方向上の結び目の値
p POINT3D 結び目の座標

Example

PROCEDURE LocusSurface;
{ Create a surface, then put loci on it }
CONST
    uMaxIndex   = 16;   { 17 points, 0 - 16 }
    vMaxIndex   = 16;   { 17 points, 0 - 16 }
    uDegree     = 3;    
    vDegree     = 4;
    xMin        = -3;
    xMax        = 3;
    yMin        = -3;
    yMax        = 3;
    zMax        = 3;
    numLoci     = 17;
VAR
    surfaceH                : HANDLE;
    x,y,z,u,v               : REAL;
    i,j                     : INTEGER;
    numKnotsU, numKnotsV    : INTEGER;
    maxFoundU, maxFoundV    : REAL;
    uStep, vStep            : REAL;
BEGIN
    { Create a Nurbs Surface }
    
    surfaceH := CreateNurbsSurface(uMaxIndex + 1, vMaxIndex + 1, uDegree, vDegree);
    IF surfaceH <> NIL THEN BEGIN
        FOR i := 0 TO uMaxIndex  DO BEGIN
            FOR j := 0 TO vMaxIndex DO BEGIN
                x := xMin + (xMax - xMin) * (i / uMaxIndex);
                y := yMin + (yMax - yMin) * (j / vMaxIndex);
                z := Cos(i - uMaxIndex / 2) *
                     Cos(j - vMaxIndex / 2) * 
                     zMax / (1 + x*x + y*y);
                NurbsSetPt3D(surfaceH, i, j, x,y,z);
            END;
        END;
        ResetBBox(surfaceH);
        
        { Add Loci }
        
        { Find number of knots in each direction }
        numKnotsU := NurbsNumKnots(surfaceH, 1);
        numKnotsV := NurbsNumKnots(surfaceH, 0);
        
        { Find the u and v real values that correspond the knots with the 
          maximum u and v indices. }
        NurbsKnot(surfaceH, 1, numKnotsU - 1, maxFoundU);       
        NurbsKnot(surfaceH, 0, numKnotsV - 1, maxFoundV);       
        
        Message(numKnotsU, ' ', numKnotsV);
        
        { Create 3D loci along each direction }
        uStep   := maxFoundU / (numLoci - 1);
        vStep   := maxFoundV / (numLoci - 1);
        
        u := 0;
        WHILE u <= maxFoundU DO BEGIN
            v := 0;
            WHILE v <= maxFoundV DO BEGIN
                NurbsSurfaceEvalPt(surfaceH, u, v, x,y,z);
                Locus3D(x,y,z);
                v := v + vStep;
            END;
            u := u + uStep;
        END;
    
        { Set View }
        Projection(0,0,9.76,-4.88,4.88,4.88,-4.88);
        SetView(#-45.0d,#-35.26438968275d,#-30.0d,0,0,0);
        RedrawAll;
    END;
END;
RUN(LocusSurface);

Version

利用可能バージョン: VectorWorks9.5

See Also

関連関数:

VS:NurbsKnot | VS:NurbsNumKnots

関連関数:

[[VS:NurbsKnot]]

| [[VS:NurbsNumKnots]]
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