SpatDIF

h1. Interpolation Extension

Any parameter change in a scene description can either be discrete (jump to) or continuous/interpolated (smooth)

h2. Interpolation flag 

h3. Interpolating on a parameter of an entity (source/sink/speaker)

@/spatdif/interpolate/source/1/position 1@

@/spatdif/interpolate/source/*/position 0@

h3. Setting a target time (duration) or imply interpolation to the next occurrence of the parameter

@/spatdif/interpolate/source/1/time 2.5@

@/spatdif/interpolate/source/1/time -1@

h3. Interpolation type

For each interpolation type the formula for increasing a normalized one-dimensional value {{latex($y_n$)}} from _0_ to _1_ over the normalized time interval {{latex($t_n$)}} starting at _0_ and ending at _1_.

*Linear*

@/spatdif/interpolate/source/1/type linear@

{{latex($y_n = t_n$)}}

*Cubic*

@/spatdif/interpolate/source/1/type cubic@

*Quadratic*

@/spatdif/interpolate/source/1/type quadratic@

*Cosine*

@/spatdif/interpolate/source/1/type cosine@

{{latex($y_n = 0.5 - 0.5 * cos(\pi * t_n$\))}}

Q: tweening/easing?