There are two things I want you to ask for a favor.

I want to make the light source, which is positioned randomly between y=0~1 and
emits the light at the specific angle, 45 degrees. The light beam forms the
conical surface.
(Q1) Can I make this light source ?

I conceive that if the light through the torus (or the disk) is only rendering,
the above requirement can meet. So, I write the source code as follows, but the
pov-ray dose not work properly. It seems to be wrong with the "projected
through" option.
(Q2) What is wrong in my source code and how to  revise it ?


The pov-ray version is 3.7.

source code:
*********************************************
#include "colors.inc"
#include "textures.inc"

background{Black}

camera {

    location <0, -1, 0>
    right <-1.33, 0, 0>
    angle 40
    look_at <0, 0.5, 0>
  }


 //Source

 #declare r2 = seed(12345);
 #declare I = 0;
 #declare number = 10;



 #while (I < number)

 #declare a = rand(r2);

 #declare Object1 = torus {
                            0.1, 0.05

                            sturm
                            translate <0, a-0.1, 0>

 }


 light_source {

        <0, a, 0>
        color 100000
        projected_through {Object1}

        }



#declare I = I+1;
#end

 *********************************************


Sincerely,
Yoneyama.

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