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我正在尝试在 PovRay 中创建一个场景，其中高斯光束（倾斜 45°）穿过焦点为 500 毫米的镜头，然后从平面反射。没有镜头的渲染没有问题，但是当我加入镜头时，渲染不再完成。

将光子数减少到 100K 时，可以渲染场景但质量不佳。当我改用光子间距时，它不会以任何给定值完成渲染。我试过在 Windows 和 Linux 上渲染。在渲染消息中，第一个光子计数始终是不同的值，但之后，每个光子计数都是 0。然后看起来像这样：

==== [Rendering...] ========================================================
Photon count 608402
Photon count 0
Photon count 0
Photon count 0
Photon count 0
Photon count 0
Photon count 0
     ...

这是我的代码，我目前有：

    // adding a photon{} block to global_settings activates photon mapping.
    // photons also need to be adjusted for light sources and objects.
    global_settings {
        photons {
            //spacing 0.01                              // specify the density of photons (0.001) for quite good quality  
            count 100000                                // alternatively use a total number of photons
            
            //gather min, max                           // amount of photons gathered during render [20, 100]
            media 20                                    // media photons
            jitter 1                                    // jitter phor photon rays
            max_trace_level 5                           // optional separate max_trace_level
            adc_bailout 1/255                           // see global adc_bailout
            //save_file "filename"                      // save photons to file
            //load_file "filename"                      // load photons from file
            autostop 0                                  // photon autostop option
            radius 10                                   // manually specified search radius
            //steps 20
            expand_thresholds 0.2, 40
        }
    } 
#declare surface_radius = 200;                          // radius of surface
#declare incident_angle = 45;                           // angle for lightreflection
#declare beam_intensity = 10000;                        // intensity of beam 
#declare lense_distance = 524; 
#declare radius_lense = 400;               

#declare lense =        intersection{
                            sphere{ <0,0,0>, radius_lense scale<1,1,1>  rotate<0,0,0>  translate<0,radius_lense-0.01,0>  
                            }                             
                            sphere{ <0,0,0>, radius_lense scale<1,1,1>  rotate<0,0,0>  translate<0,-radius_lense+0.01,0>  
                        }
                            material{   
                                texture { pigment{ rgbf <0.98, 0.98, 0.98, 0.9> }
                                          finish { diffuse 0.1 reflection 0.2 specular 0.8 roughness 0.0003 phong 1 phong_size 400}
                                } 
                                interior{ ior 1.5 caustics 0
                                } 
                            } 
                             
                            translate<0,lense_distance,0> rotate<0,0,incident_angle>
                            photons {
                                target
                                refraction on
                                reflection off
                                collect off
                            }  
                        }

camera {
    location <-40,40,-70>                             // position
    look_at  <0, 0, 0>                                // view
    right x*1920/1080                                 // aspect
    angle 40
}

// Gaussian
light_source {
    <0,0,0>                                           // light's position (translated below)
    color rgb <0,beam_intensity,0>                    // light's color and intensity
    //spotlight
    cylinder
    translate <0,2*lense_distance, 0>                             // <x y z> position of light 
    parallel
    point_at <0, 0, 0>                                // direction of spotlight
    radius 5                                          // hotspot (inner, in degrees)
    tightness 5                                       // tightness of falloff (1...100) lower is softer, higher is tighter
    falloff 5                                         // intensity falloff radius (outer, in degrees) 
    rotate <0,0,incident_angle>
}

object{lense} 

// flat surface
union{
    merge{       
        cylinder { <0,-1,0>,<0,0,0>, surface_radius} 
        
    }
    texture{ pigment { color rgb<1,1,1> }
        normal { spotted 0.1 scale -0.005 }
        finish { specular 1 phong 1 reflection{ 1.00 metallic 1.00} }
    } 
    scale <1,1,1> rotate <0,0,0> translate<0,0,0>
    photons {
        target
        refraction off
        reflection on
        collect on
    }
}
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