I want to render an image that has several objects in it, say a sphere, torus
and a cube. All these objects cast a shadow on a white plane. What I'd like is
for the plane to be completely featureless - that is to say completely white -
except for the shadows cast by the aforementioned objects. Currently, if I set
the ambient property of the plane to 1, the shadows of the objects do not
appear. If I set the ambient property to 0, the plane appears grey and doesn't
display a consistent color, rather a smooth gradient as the plane moves away
from the light source. Is there an easy way to achieve the desired result?

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