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How to get a random point in a hollow circle

alt text

Like in this image,player is the red point,and I want to get random point in black area.

Product Version: UE 4.22
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asked Aug 14 '19 at 06:16 AM in C++ Programming

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xermao
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2 answers: sort voted first

Idk about c++, but with blueprints you would take the random unit vector node and multiply the by the radius of your circle. Could use the random float in range node for the radius to control the width of the circle.

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answered Aug 14 '19 at 06:53 AM

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IndieGameCove
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avatar image xermao 5 days ago

Can you post a picture about the blueprint you talk?I'm not familiar with blueprint

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Here the c++ version:

 3D : 
 auto result = FMath::VRand(); 
 result *= FMath::RandRange(BlackAreaInnerRadius,BlackAreaOuterRaduis);
 
 2D : 
 auto result = FVector2D(FMath::VRand()); 
 result.Normalize();
 result *= FMath::RandRange(BlackAreaInnerRadius,BlackAreaOuterRaduis);
 

you would need to add the player location to the result obviously

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answered Aug 14 '19 at 10:24 AM

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Firefly74
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