DG Kernel (ActiveX) Documentation


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I3Dpt Interface

Get
Set
GetCoord
SetCoord
Add
Subtr
Mult
Copy
Norm
Normalize
Dist
Product
CrossProduct
Angle

I3Dpt interface represents 3D point or 3D vector depending on the context. The interface provides methods for simple operations with such objects. The interface is designed to allow creation of points or vectors for background calculations. To create a new point or vector, implementing the interface use IObjectGenerator_DG.Create("I3Dpt") > I3Dpt query.

For example, to calculate  angle between two vectors call IObjectGenerator_DG.Create("I3Dpt")  twice to create two vectors and obtain its interfaces, say i3DPt0 and i3DPt1. Use Set method below to define its coordinates and call i3DPt0.Angle(i3DPt1).

See also Collision Sample, Interface List


HRESULT Get( double* x, double* y, double* z )

Parameters

 x, y, z - [out] the returned coordinates of the element

Return Values

S_OK in case of success.
 
Remarks:

The methods returns the three coordinates of the point or vector.


HRESULT Set( double x, double y, double z)

Parameters

x, y, z - [in] new coordinates of the element

Return Values

S_OK in case of success.
Remarks:

Sets the three coordinates of the point or vector.


HRESULT GetCoord( short coord, double* val)

Parameters

coord - [in] index of the coordinate to retrieve.

val - [out] the returned value of the coordinate

Return Values

S_OK in case of success.
Remarks:

Returns coord -th component of the element


HRESULT SetCoord( short coord, double val)

Parameters

coord - [in] index of the coordinate to set.

val - [in] new value of the coordinate

Return Values

S_OK in case of success.
Remarks:

Sets coord -th component of the element.


HRESULT Add( I3Dpt* v )

Parameters

v - [in] I3dpt interface of the element to be added to this element

Return Values

S_OK in case of success.
Remarks:

The method adds coordinates of element v to coordinates of the element, which implements this interface.


HRESULT Subtr( I3Dpt* v )

Parameters

v - [in] I3dpt interface of the element to be subtracted from this element

Return Values

S_OK in case of success.
Remarks:

The method subtracts coordinates of element v from coordinates of the element, which implements this interface.


HRESULT Mult( double m )

Parameters

m - [in] factor to multiply coordinates of this element by

Return Values

S_OK in case of success.
Remarks:

The method multiplies all coordinates of this element by m


HRESULT Copy( I3Dpt* p )

Parameters

p - [in] element to copy

Return Values

S_OK in case of success.
Remarks:

Makes all coordinates of this equal to those of p


HRESULT Norm( double* norm )

Parameters

norm - [out] The returned value of Cartesian norm of the element

Return Values

S_OK in case of success.
Remarks:

Calculates norm of the element, (square root of sum of squares of all coordinates), which is length in case of the vector or distance to the origin on case of a point


HRESULT Normalize(VARIANT_BOOL* result)

result - [out] The returned success code. False is returned when the element is zero, more precisely when it has all coordinates in absolute value less than 1e-10.

Return Values

S_OK in case of success.
Remarks:

The method extends or shortens the vector to make its length equal to 1.0 when possible or returns false otherwise and leaves all coordinates unchanged (less than 1e-10 in absolute value).


HRESULT Dist( I3Dpt* p, double* dist )

Parameters

p - [in] point to calculate distance to.

dist - [out] the returned distance

Return Values

S_OK in case of success.
Remarks:

Returns distance between p and this.


HRESULT Product( I3Dpt* v, double* product )

Parameters

v - [in] I3dpt interface of the second element in the inner product

product - [out] the returned inner product of this and v

Return Values

S_OK in case of success.
Remarks:

Calculates inner product (sum of products or respective coordinates) of this and v.


HRESULT CrossProduct( I3Dpt* v, I3Dpt* u )

Parameters

v, u - [in] vectors Cross Product of which is to be calculated

Return Values

S_OK in case of success.
Remarks:

After call to the CrossProduct method this vector will have coordinates of Cross Product of v and u.


HRESULT Angle( I3Dpt* v, double* angle )

Parameters

v - [in] the second vector for angle calculation

angle - [out] the returned angle in radians between this and v

Return Values

S_OK in case of success.
Remarks:

The method returns angle in radians between this and v. Both vectors must not be zero otherwise an exception will be thrown.