My DirectionalLight shadow is broken, but why?

Probably the frustum of the light’s internal shadow camera is too tight. Have a look at the following example that shows how to configure the mentioned frustum. Relevant code section:

Keep in mind that the frustum should be as tight as possible in order to achieve good shadow quality.

Related: Explain the property of light.shadow.camera.near/far/right/left/top/bottom?

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