Q3Quaternion_InterpolateFast (IM: QD3D)

Inside Macintosh: 3D Graphics Programming With QuickDraw 3D /

Chapter 20 - QuickDraw 3D Mathematical Utilities / QuickDraw 3D Mathematical Utilities Reference

QuickDraw 3D Mathematical Utilities / Managing Quaternions

Q3Quaternion_InterpolateFast
You can use the Q3Quaternion_InterpolateFast function to interpolate quickly between two quaternions.
TQ3Quaternion *Q3Quaternion_InterpolateFast (
const TQ3Quaternion *q1, 
const TQ3Quaternion *q2, 
float t, 
TQ3Quaternion *result);
q1
A quaternion.
q2
A quaternion.
t
An interpolation factor. This parameter should contain a value between 0.0 and 1.0.
result
On exit, a quaternion that is a fast interpolation between the two specified quaternions.

DESCRIPTION
The Q3Quaternion_InterpolateFast function returns, as its function result and in the result parameter, a quaternion that interpolates between the two quaternions specified by the q1 and q2 parameters, according to the factor specified by the t parameter. If the value of t is 0.0, Q3Quaternion_InterpolateFast returns a quaternion identical to q1. If the value of t is 1.0, Q3Quaternion_InterpolateFast returns a quaternion identical to q2. If t is any other value in the range [0.0, 1.0], Q3Quaternion_InterpolateFast returns a quaternion that is interpolated between the two quaternions.
The interpolation returned by Q3Quaternion_InterpolateFast is not as smooth or constant as that returned by Q3Quaternion_InterpolateLinear, but Q3Quaternion_InterpolateFast is usually faster than Q3Quaternion_InterpolateLinear.