Hey Matthew,

What I think is happening, is that your heightfield is terraced (shaped like
steps) and your light-source is very close to the surface. This causes rays
from the light to hit the vertical edge of the terraces and not the tops of
them making the flat sides seem to glow white because your light source is
multiplied by 1.9. You can reduce the appearance of these white spots by
moving your light source higher in your scene. This however does not change
the fact that your heightfield looks like steps in profile.

Hope this answers your question,

J.N. Roy

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