shade_normals(self, normals, fraction=1.0)
Imagine an artificial sun placed at infinity in some azimuth and elevation position illuminating our surface. The parts of the surface that slope toward the sun should brighten while those sides facing away should become darker.
Increases or decreases the contrast of the hillshade. Values greater than one will cause intermediate values to move closer to full illumination or shadow (and clipping any values that move beyond 0 or 1). Note that this is not visually or mathematically the same as vertical exaggeration.
A 2D array of illumination values between 0-1, where 0 is completely in shadow and 1 is completely illuminated.
Calculate the illumination intensity for the normal vectors of a surface using the defined azimuth and elevation for the light source.
The following pages refer to to this document either explicitly or contain code examples using this.
matplotlib.colors.LightSource.hillshade
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