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This question already has an answer here:

In the picture the sun makes a diffuse shadow on the interior wall of the poolhouse. I want this to be a sharp shadow (as would be the case in real life, with a full sun). Don't know if and how I have to change the wall material and/or the lighting (or whatever).

(the material of the wall is shown on the right panel, as "concrete")

enter image description here

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marked as duplicate by Samoth, zeffii, p2or, X the fluffy 27 unicorn, VRM Jan 14 '16 at 15:46

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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A sun lamp with size 0 will give you a very sharp shadow:

enter image description here

As you increase the lamp's size it will give you much softer shadows.

enter image description here

enter image description here

related: Meaning of Sun Lamp Size?

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