Shadow glitches in Cycles When I render my scene in Cycles, I get these really weird glitches (Pictured in image). They happen more and more frequently the less directally my light source is illuminating them. Sorry if this is relatively simple, I am new to blender.



I might add that the render is an animation which both needs both very high (60000m) and fairly low (6m) clipping distance, and these glitches look a bit like what happens in the viewport when I set the clip distance really low. Not sure if this is at all relevant just thought that I might as well add it.
Have you tried recalculating normals? I often get weird artifacts/shadows when the normals get flipped around.

Tab into edit mode with your mesh selected
Select all the faces of the mesh with A
For blender 2.8 SHIFT + N brings up the recalculate normals tool. You want to &quot;Recalculate Outside&quot;.

Or you can access this via:
Edit Mode &gt; A &gt; Mesh menu &gt; Normals &gt; Recalculate Outside

https://all3dp.com/2/blender-recalculate-normals-simply-explained/#:~:text=There%20are%20two%20main%20ways,so%20they%20all%20face%20outwards.
Explanation of normals from All3DP:

Ever wondered why your Blender model is sometimes plagued by random
black voids?
The normal of a face describes the direction it’s pointing or facing.
Usually, in a closed model, all normals should be facing outwards.
However, sometimes when manually manipulating edges and faces in
Blender, the normals get flipped. It’s not the end of the world, but
it does make your model look weird. And once you export the model,
flipped normals can leave behind bad artifacts.
That’s why it’s best to fix these flipped normals. And the good news
is, they’re super easy to recalculate.