Keep sun irradiance constant when changing distance and size�

Author: mororo250

sandbox/settings/appleseed.studio.xml

@@ -13,14 +13,11 @@
         <parameters name="file_dialog">
             <parameters name="frames">
                 <parameter name="last_directory" value="D:\appleseed-scenes" />
-                <parameter name="selected_filter" value="JPEG Files (*.jpg *.jpe *.jpeg *.jif *.jfif *.jfi)" />
-            </parameters>
-            <parameters name="light_paths">
-                <parameter name="selected_filter" value="" />
+                <parameter name="selected_filter" value="Bitmap Files (*.bmp *.cin *.dds *.dpx *.fits *.hdr *.rgbe *.ico *.iff *.z *.jpg *.jpe *.jpeg *.jif *.jfif *.jfi *.null *.nul *.exr *.sxr *.mxr *.png *.ppm *.pgm *.pbm *.pnm *.pfm *.psd *.pdd *.psb *.rla *.sgi *.rgb *.rgba *.bw *.int *.inta *.socket *.pic *.tif *.tiff *.tx *.env *.sm *.vsm *.tga *.tpic *.zfile)" />
             </parameters>
             <parameters name="projects">
-                <parameter name="last_directory" value="D:\appleseed\sandbox\tests\test scenes\light importance multipliers" />
-                <parameter name="selected_filter" value="Project Files (*.appleseed *.appleseedz)" />
+                <parameter name="last_directory" value="D:\appleseed-scenes" />
+                <parameter name="selected_filter" value="Plain Project Files (*.appleseed)" />
             </parameters>
         </parameters>
         <parameters name="render_region">

src/appleseed/renderer/modeling/light/sunlight.cpp

@@ -294,6 +294,7 @@ void SunLight::evaluate(
         square(static_cast<float>(distance_to_center)));
 
     value.set(radiance, g_std_lighting_conditions, Spectrum::Illuminance);
+    value *= m_sun_solid_angle;
 }
 
 void SunLight::compute_sun_radiance(
@@ -566,7 +567,7 @@ void SunLight::sample_sun_surface(
 
     outgoing = normalize(target_point - position);
     Vector2d test = static_cast<double>(SunRadius * m_values.m_size_multiplier) * p;
-    float squared_distance_to_center = test[0] * test[0] + test[1] * test[1];
+    double squared_distance_to_center = test[0] * test[0] + test[1] * test[1];
 
 
     RegularSpectrum31f radiance;
@@ -575,7 +576,7 @@ void SunLight::sample_sun_surface(
         m_values.m_turbidity,
         m_values.m_radiance_multiplier,
         radiance,
-        squared_distance_to_center);
+        static_cast<float>(squared_distance_to_center));
 
     value.set(radiance, g_std_lighting_conditions, Spectrum::Illuminance);