YACHT DESIGN SOFTWARE
EUROPEAN DISTRIBUTOR FOR
AEROHYDRO
MARINE DESIGN SOFTWARE
3D Points  Beads  Magnets  Rings 
Point  Bead  Magnet  Ring 
Blended Point  
Center Point  
Copy Point  Copy Bead  Copy Magnet  Copy Ring 
Intersection Point  Intersection Bead  Intersection Magnet  Intersection Ring 
Mirrored Point  
Offset Point  
Projected Point  Projected Magnet  
Rotated Point  
Tabulated Point  
Tangent Point  Tangent Magnet  
Arclength Bead  Arclength Ring  
Proximity Bead  Proximity Magnet  Proximity Ring  
XYZ Bead  XYZ Magnet  XYZ Ring 
Curve entities  Snake entities 
Arc  Arc Snake 
Bspline FittedCurve  Bspline Fitted Snake 
Bspline Curve  Bspline Snake 
Cspline Curve  Cspline Snake 
Conic Section  
Contour Curve  
Copy Curve  Copy Snake 
Edge Snake  
Expanded Curve  
Foil Curve  Foil Snake 
Helix  
Geodesic Snake  
Intersection Snake  
Line  Line Snake 
Mirrored Curve  
NUBspline Fitted Curve  NUBspline Fitted Snake 
NURBS Curve  NURBS Snake 
Offset Curve  
PolyCurve  PolySnake 
Procedural Curve  Procedural Snake 
Projected Curve  Projected Snake 
Radius Arc  
Relative Curve  Relative Snake 
Rotated Curve  
SubCurve  SubSnake 
Tabulated Curve  
XSpline Curve  
UVSnake 
Arc Lofted Surface  Blend Surface  Blister 
Bspline Fitted Surface  Bspline Lofted Surface  Bspline Surface 
Centerpoint Boundary Surface  Copy Surface  Cspline Lofted Surface 
Developable Surface  Expanded Surface  Foil Lofted Surface 
Mirrored Surface  NUBspline Fitted Surface  NURBS Surface 
Offset Surface  PolySurface  Procedural Surface 
Projected Surface  Relative Surface  Revolution Surface 
Rolling Ball Fillet  Rotated Surface  Ruled Surface 
SubSurface  Sweep Surface  Tabulated Surface 
Tangent Boundary Surface  Translation Surface  Trimmed Surface 
XSpline Lofted Surface 
Block Solid  Boundary Solid  Bspline Lofted Solid 
Bspline Solid  Copy Solid  Ruled Solid 
Copy TriMesh  Expanded TriMesh  Light TriMesh 
Offset TriMesh  PolyTriMesh  Surface TriMesh 
TriMesh  TriMesh Bspline Snake  TriMesh Copy Magnet 
TriMesh Copy Ring  TriMesh Copy Snake  TriMesh Edge Snake 
TriMesh Intersection Snake  TriMesh Magnet  TriMesh Projected Magnet 
TriMesh Projected Snake  TriMesh Ring  TriMesh SubSnake 
Composite Surface  Contours  Copy Contours 
Strain Contours  Copies  Entity List 
Formula  3point Frame  RPY Frame 
Graph  PolyGraph  Knot List 
Plane  Relabel  Text Label 
Variable  Wireframe 
Name  Argument(s)  Result  Synopsis 
ABS  1, any units  Same units as argument  Absolute value 
ACOS  1: unitless  unitless  arc cosine (radians) 
ACOSD  1: unitless  unitless  arc cosine (degrees) 
ALARM  2: any units  Unitless  ALARM has 2 arguments ALARM(x,y). The alarm "goes off" (goes into error) if (1) it is set (x > 0) AND (2) y < 0. Using a formula or expression for y, you can build various warning limits into a model. 
ANGLE  3: point, point, point  Unitless (degree)  Angle of three points (angle at pt2 between the directions to pt1 and pt3) 
ARCLEN  3: curve, unitless, unitless  Length  Arc distance along curve, from t1 to t2 
AREA  2: surface, use_sym (0 or 1)  Area = L^2  Area of surface, CompSurf, or TriMesh 
ASIN  1: unitless  unitless  arc sine (radians) 
ASIND  1: unitless  unitless  arc sine (degrees) 
ATN  1, unitless  Radian (unitless)  Arc tangent 
ATND  1, unitless  Degree (unitless)  Arc tangent (in degrees) 
ATN2  2, both with same units  Radian (unitless)  Arc tangent(y/x) 
ATN2D  2, both with same units  Degree (unitless)  Arc tangent(y/x) (in degrees) 
BBOX  1. Entity or Entity List 2. Real scale factor 3. Real sign 4. Index, 1 to 3 for X, Y, or Z component  Length  The BBOX function gets information about the bounding box of an entity, or a set of entities specified by an Entity List. A bounding box is the smallest rectangular solid, aligned with the global coordinate system, that encloses the selected entities. 
BSPL  1. KnotList, or *UNIFORM for uniformly spaced knots. 2. K, polynomial order (2 for linear, 3 for quadratic, 4 for cubic, etc.) 3. N, number of basis functions. 4. I, index indicating which basis function to evaluate (1 to N). 5. T, parameter (nominal range 0 to 1, but can be any real value) 
unitless  The BSPL function evaluates the socalled “Bspline basis functions”, which are the mathematical foundations of Bspline and NURBS curves and surfaces. Example: BSPL( *UNIFORM, 3, 5, 2, 0.40) returns 0.3200. In this case the knots are uniform (0, 0, 0, 1/3, 2/3, 1, 1, 1); the Bsplines are quadratic (K = 3); there are N = 5 of them; I = 2 selects the second basis function; T is 0.40. Errors: 222. NURB has too few knots for its order and number of control points. 223. NURB has too many knots for its order and number of control points. 234. Insufficient spacing between knots. 556. BSPL function: order less than 1. 557. BSPL function: number of basis functions less than 1. 558. BSPL function: index is out of range (1 to number of basis functions). 
CEIL  1: any units  Same units as argument  CEIL(x) is the smallest integer that is greater than or equal to x. 
CENTROID  3: entity, use_sym (0 or 1), index (13, for X,Y,Z coordinate)  Length  Coordinates of centroid 
CLEAR  2: point, graphic entity  Length  Clearance 
COS  1, radian (unitless)  Unitless  Cosine 
COSD  1, degree (unitless)  Unitless  Cosine (of angle in degrees) 
COSH  1: unitless  unitless  hyperbolic cosine 
CURV  1/Length  Curvature of host curve or snake, at t location of bead/ring. If t is on a breakpoint, hi_side (0 or 1) controls whether curvature is measured below or above the break. kind: 0 is 3D curvature of curve or snake; 1 is normal curvature of snake; 2 is geodesic curvature of snake. 

CURVINT  3: curve, t, real  L times units of real  Integral of real times ds along curve. ds is the element of arc length along the curve. t is a Variable. real is a Formula descended from t. 
DIST  2: point, point  Length  Distance between points 
ERROR  1: entity  Unitless  Error code attached to entity (0 if no error). 
EXP  1, unitless  Unitless  Exponential 
FLOOR  1: any units  Same units as argument  FLOOR(x) is the greatest integer that is less than or equal to x. 
FRAMEPOS  3: point, frame, index (13, for x,y,z coordinate)  Length  Coordinates of point in frame 
GRAPH  2: graph, unitless  Unitless  Evaluation of graph 
HYDRO  6: sp.gr., Zcg, sink, trim, heel, index  various, depending on index  Fixedposition hydrostatics based on the visible contours. index is 1 to 29; selects one of 29 results, e.g. index = 6 for displacement volume; index = 15 for wetted surface. 
IF  3: any units  Same as units of selected argument  If arg1 >0, arg2; else arg3 
LOG  1, unitless  Unitless  Natural logarithm 
LOG10  1, unitless  Unitless  Base10 logarithm 
MASS  3: entity, use_sym, index  M ML 
Mass, if use_sym is not 0, includes symmetry images. Index = 0 returns Mass. Index = 1, 2 or 3, the value returned is the mass moment with respect to X, Y or Z. This is the product of mass times the X, Y or Z coordinate of the centroid. Unit dimensions are ML. 
MAX  2, both with same any units  Same units as arguments  Maximum 
MIN  2, both with same any units  Same units as arguments  Minimum 
PI  1; any units  Unitless  PI has 1 argument, but its value is immaterial; PI(x) = pi for any x. 
ROUND  1, any units  Same units as argument  Rounding to integer 
ROUND2  1, any units  Same units as argument  ( x, places) rounds x to the specified number of decimal places. E.g., ROUND2(PI(0),2) is 3.140000. 
SIGN  1: any units  Unitless  SIGN(x) is +1 when x > 0, 1 when x < 0, 0 when x = 0. 
SIN  1, radian (unitless)  Unitless  Sine 
SIND  1, degree (unitless)  Unitless  Sine (of angle in degrees) 
SINH  1: unitless  unitless  hyperbolic sine 
SQRT  1, unit dimensions all multiples of 2  Unit dimensions of argument divided by 2  Square root 
STRAIN  2: Surface/TriMesh, index  Unitless  Surface/TriMesh is a surface or TriMesh entity index = 0 or 1, for minimum or maximum strain This function reports the strain range for an Expanded Surface or Expanded TriMesh. 
SURFCURV  5: magnet, hi_side_u, hi_side_v, kind, angle  L^1 for kind = 0 or 2; L^2 for kind = 1  Surface curvature kind = 0, normal curvature kind = 1, Gaussian curvature kind = 2, mean curvature 
SURFINT  4: surface, u, v, real  L^2 times units of real  Integral of real times dA over surface dA is the element of area on the surface u and v are Variables real is a Formula descended from u and v. 
TAN  1, radian (unitless)  Unitless  Tangent 
TAND  1, degree (unitless)  Unitless  Tangent (of angle in degrees) 
TANH  1: unitless  unitless  Hyperbolic tangent 
TPOS  1, bead or ring  Unitless  t parameter 
UNITMASS  1: entity  M for a point ML^1 for a curve ML^2 for a surface ML^3 for a solid 
unit weight property of entity 
UPOS  1, magnet or ring  Unitless  u parameter 
VELOCITY  3: curve, t, hi_side  Length  Rate of change of arc length with respect to t If t is on a breakpoint, hi_side (0 or 1) controls whether velocity is measured below or above the break. 
VOLUME  2: solid, use_sym (0 or 1)  Volume = L^3  Volume of solid 
VPOS  1, magnet or ring  Unitless  v parameter 
XPOS  1, point  Length  X coordinate 
YPOS  1, point  Length  Y coordinate 
ZPOS  1, point  Length  Z coordinate 