chrampderiv

Since	18.0

float  chrampderiv(string channel, float ramppos)

float  chrampderiv(string channel, float ramppos, float time)

vector  chrampderiv(string channel, float ramppos)

vector  chrampderiv(string channel, float ramppos, float time)

Evaluates the derivative of a parm parameter with respect to position.

The ramppos is where on the ramp to evaluate. The ramppos is clamped to the range [0,1]

The time parameter can be used if the ramp is animated to evaluate at other than the current time. Note that this does not take a derivative with respect to time.