3D Graphics Programming with QuickDraw 3D 1.5.4

Determining Vector Dot Products

QuickDraw 3D provides routines that you can use to calculate dot (or scalar , or inner ) products of vectors.

Q3Vector2D_Dot

You can use the Q3Vector2D_Dot function to determine the dot product of two two-dimensional vectors.



 
float Q3Vector2D_Dot (

                     const TQ3Vector2D *v1, 

                     const TQ3Vector2D *v2);

The Q3Vector2D_Dot function returns, as its function result, a floating-point value that is the dot product of the two vectors v1 and v2 .

You can use the Q3Vector3D_Dot function to determine the dot product of two three-dimensional vectors.



 
float Q3Vector3D_Dot (

                     const TQ3Vector3D *v1, 

                     const TQ3Vector3D *v2);

The Q3Vector3D_Dot function returns, as its function result, a floating-point value that is the dot product of the two vectors v1 and v2 .