freeware http://www.akustische-kunst.org/maxmsp/			a collection of externals for trigonometrical calculations and conversions. The 8 objects include conversion between angular and cartesian coordinate systems and some vector calculations.
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trig.ang2cart	External		Converts angular coordinates (azi/ele/dist) into cartesian (X/Y/Z).
trig.cart2ang	External		Converts cartesian coordinates (X/Y/Z) into angular (azi/ele/dist).
trig.crossprod	External		Calculates the vector cross product.
trig.deg2rad	External		Converts degrees (-180¡ - +180¡) into radiant (-pi - +pi).
trig.rad2deg	External		Converts radiant (-pi - +pi) into degrees (-180¡ - +180¡).
trig.vecang	External		Calculates the angle between vectors.
trig.veclen	External		Calculates the length of a vector.
trig.vecprod	External		Calculates the vector dot product.
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