Also, what if I scale the camera before I add the focal_blur? I am 
having trouble with a scene in which the center never appears in focus 
like I want it to.

:(



On 2/10/2018 7:47 PM, Mike Horvath wrote:
> What effect does scaling a camera have on focal_blur?
> 
> I have two cameras, and they should both produce the same result. But 
> they don't.
> 
> 
> 
> // focal blur camera
> camera {
>    location  <0,0,-5>
>    look_at   <0,0,0>
>    right     x*image_width/image_height
>    up y
>    aperture 1.0           // [0...N] larger is narrower depth of field 
> (blurrier)
>    blur_samples 10        // number of rays per pixel for sampling
>    focal_point <0,0,0>    // point that is in focus <X,Y,Z>
>    confidence 0.95        // [0...<1] when to move on while sampling 
> (smaller is less accurate)
>    variance 1/200         // [0...1] how precise to calculate (smaller 
> is more accurate)
>    scale 2
> }
> 
> /*
> // focal blur camera
> camera {
>    location  <0,0,-10>
>    look_at   <0,0,0>
>    right     x*image_width/image_height
>    up y
>    aperture 1.0           // [0...N] larger is narrower depth of field 
> (blurrier)
>    blur_samples 10        // number of rays per pixel for sampling
>    focal_point <0,0,0>    // point that is in focus <X,Y,Z>
>    confidence 0.95        // [0...<1] when to move on while sampling 
> (smaller is less accurate)
>    variance 1/200         // [0...1] how precise to calculate (smaller 
> is more accurate)
> }
> */

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