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Detect the normal of a polygon face

Hello everyone.

I am trying to deflect a non physic projectile with a pipe, So I thinked to get the normal of the face the projectile hits using a linetrace, but when I get the normal that always returned me the normal of the object, not the normal of the impact face.

Anyone knows how can I detect that normal to send the projectile in that way? I am using blueprints for all of this.

Thanks for your time

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Product Version: UE 4.20
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asked Aug 10 '18 at 11:12 AM in Blueprint Scripting

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2 answers: sort voted first

Check if this helps:


Edit: In short - the normal should be correct. To draw it correctly, however you should make:

 Start = ImpactPoint;
 End = ImpactPoint + ImpactNormal * 100.0f;
 //The *100 is just because the ImpactNormal is 1 centimeter long by definition and you might not see it.

Also, you don't need the second LineTraceByChannel just to draw a line. You can use DrawDebugLine instead.

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answered Aug 10 '18 at 11:56 AM

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Non physics actors can still use Collision hit results and dont have to trace in addition to that. The collision should give an impact normal

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answered Aug 10 '18 at 12:55 PM

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