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// pattern for use in texture/pigment
// this pattern can only be used when applied to an object
// value is influenced by the slope of the object
slope
y, // direction vector for slope
//y, // optional: dependency from altitude
//<0.5,1.0>, // optional: range of slope values
//<0.75,1.0> // optional: range of altitude values
// alternativly (new in 3.7):
/*
slope { point_at <ReferencePoint> [, Lo_Slope, Hi_Slope] }
(Note that this variant currently does *not* allow for the "altitude" keyword to be used.)
The functionality is similar to MegaPOV's "aoi <ReferencePoint>" pattern,
except that the values are reversed, i.e. range from 0.0 for surfaces
facing away from the point in question, to 1.0 for surfaces facing towards
that point; thus, "slope { <Vector> }" and "slope { point_at
<Vector>*VeryLargeNumber }" have virtually the same effect.
*/
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