lspline

float  lspline(float sample_pos, float value1, ...)

Samples a polyline defined by a series of (linearly spaced) values. This is useful for specifying a 1D data ramp.

vector  lspline(float sample_pos, vector value1, ...)

vector4  lspline(float sample_pos, vector4 value1, ...)

Samples a polyline defined by a series of (linearly spaced) vector values. This is useful for specifying a color ramp.

If you need variably-spaced keys, use lkspline instead.

sample_pos

The position along the curve at which to sample the value.

valuen

To define the shape of the curve, you pass a number of values specifying the key points through which the curve passes. The function automatically spaces the keys evenly.

Tip The spline function is a more flexible superset of this function.