Eevee: Add irradiance smoothing

This is a parameter that will make the interpolation between irradiance
cells of a same Irradiance Volume smoother, reducing the weight of the
light leaking correction factors.

It is usefull in some cases to avoid harsh lighting transition that can
happen when a sample point it near a surface.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_scene.c b/source/blender/makesrna/intern/rna_scene.c
index 123ed562343..850560646ec 100644
--- a/source/blender/makesrna/intern/rna_scene.c
+++ b/source/blender/makesrna/intern/rna_scene.c
@@ -5682,6 +5682,12 @@ static void rna_def_scene_eevee(BlenderRNA *brna)
 	                               "Size of the shadow map applied to each irradiance sample");
 	RNA_def_property_override_flag(prop, PROPOVERRIDE_OVERRIDABLE_STATIC);
 
+	prop = RNA_def_property(srna, "gi_irradiance_smoothing", PROP_FLOAT, PROP_FACTOR);
+	RNA_def_property_range(prop, 0.0f, FLT_MAX);
+	RNA_def_property_ui_range(prop, 0.0f, 1.0f, 5, 2);
+	RNA_def_property_float_default(prop, 0.1f);
+	RNA_def_property_ui_text(prop, "Irradiance Smoothing", "Smoother irradiance interpolation but introduce light bleeding");
+
 	prop = RNA_def_property(srna, "gi_show_irradiance", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_sdna(prop, NULL, "flag", SCE_EEVEE_SHOW_IRRADIANCE);
 	RNA_def_property_boolean_default(prop, 0);