POV-Ray : Newsgroups : povray.advanced-users : Why don't shadows get blurry after a certain distance? ("Distance Field Sha= : Re: Why don't shadows get blurry after a certain distance? ("Distance Field= Sha=3D Server Time
11 Aug 2022 10:56:20 EDT (-0400)
  Re: Why don't shadows get blurry after a certain distance? ("Distance Field= Sha=3D  
From: HackerDaGreat57
Date: 4 Jun 2022 13:00:00
Message: <web.629b8f38d86d60da2dae6647fefbff93@news.povray.org>
Alain Martel <kua### [at] videotronca> wrote:

> > I was just rendering the Biscuit sample and found something strange: The shadows
> > on objects don't get blurrier as they get farther away from the object.
> >
> > If your mind is completely foggy and you are confused and don't know what I'm
> > talking about, take a look at this Unreal Engine 4 documentation page:
> >
https://docs.unrealengine.com/4.27/en-US/BuildingWorlds/LightingAndShadows/RayTracedDistanceFieldShadowing/
> >
>
> That scene use a point light. That kind of light always produce sharp
> shadows without any blurring. It's an infinitely small light source.
>
> The used light is :
> light_source {<-140,200, 300> rgb <1.0, 1.0, 0.95>*1.5}
>
> To have blurring shadows, you need to use an area_light.
> Change it to :
> #declare Size = 3;
> light_source {<-140,200, 300> rgb <1.0, 1.0, 0.95>*1.5 area_light Size*x
> Size*z 17 17 jitter adaptive 0 circular orient}
>
> to simulate a spherical light source with a diameter of 3 units.

> sampling method.

> shadow get blurry.

Is it possible to change the 'Radius' of the point light? Like in Blender's
Cycles for example, there is an option to change the point light's radius which
increases the 'amount' of penumbra on my shadows.

Thanks anyway for the useful reference though.


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