3D Graphics Programming with QuickDraw 3D 1.5.4

Scaling Vectors

QuickDraw 3D provides routines that you can use to multiply a vector by a floating-point scalar value.

Q3Vector2D_Scale

You can use the Q3Vector2D_Scale function to scale a two-dimensional vector.



 
TQ3Vector2D *Q3Vector2D_Scale (

                     const TQ3Vector2D *vector2D, 

                     float scalar, 

                     TQ3Vector2D *result);

vector2D: A two-dimensional vector.
scalar: A floating-point number.
result: On exit, a two-dimensional vector that is the result of multiplying each of the components of vector2D by the value of the scalar parameter.

DESCRIPTION

The Q3Vector2D_Scale function returns, as its function result and in the result parameter, the two-dimensional vector that is the result of multiplying each of the components of the vector vector2D by the value of the scalar parameter. Note that on entry the result parameter can be the same as the vector2D parameter.

Q3Vector3D_Scale

You can use the Q3Vector3D_Scale function to scale a three-dimensional vector.



 
TQ3Vector3D *Q3Vector3D_Scale (

                     const TQ3Vector3D *vector3D, 

                     float scalar, 

                     TQ3Vector3D *result);

vector3D: A three-dimensional vector.
scalar: A floating-point number.
result: On exit, a three-dimensional vector that is the result of multiplying each of its components by the value of the scalar parameter.

DESCRIPTION

The Q3Vector3D_Scale function returns, as its function result and in the result parameter, the three-dimensional vector that is the result of multiplying each of the components of the vector vector3D by the value of the scalar parameter. Note that on entry the result parameter can be the same as the vector3D parameter.