Modify display and documentation of attenuation for Light3D

doc/classes/OmniLight3D.xml

@@ -14,8 +14,10 @@
 	</tutorials>
 	<members>
 		<member name="omni_attenuation" type="float" setter="set_param" getter="get_param" default="1.0">
-			The light's attenuation (drop-off) curve. A number of presets are available in the [b]Inspector[/b] by right-clicking the curve. Zero and negative values are allowed but can produce unusual effects.
+			Controls the distance attenuation function for omnilights.
-			[b]Note:[/b] Very high [member omni_attenuation] values (typically above 10) can impact performance negatively if the light is made to use a larger [member omni_range] to compensate. This is because culling opportunities will become less common and shading costs will be increased (as the light will cover more pixels on screen while resulting in the same amount of brightness). To improve performance, use the lowest [member omni_attenuation] value possible for the visuals you're trying to achieve.
+			A value of [code]0.0[/code] smoothly attenuates light at the edge of the range. A value of [code]1.0[/code] approaches a physical lighting model. A value of [code]0.5[/code] approximates linear attenuation.
+			[b]Note:[/b] Setting it to [code]1.0[/code] may result in distant objects receiving minimal light, even within range. For example, with a range of [code]4096[/code], an object at [code]100[/code] units receives less than [code]0.1[/code] energy.
+			[b]Note:[/b] Using negative or values higher than [code]10.0[/code] may lead to unexpected results.
 		</member>
 		<member name="omni_range" type="float" setter="set_param" getter="get_param" default="5.0">
 			The light's radius. Note that the effectively lit area may appear to be smaller depending on the [member omni_attenuation] in use. No matter the [member omni_attenuation] in use, the light will never reach anything outside this radius.

doc/classes/SpotLight3D.xml

@@ -24,8 +24,10 @@
 			The spotlight's [i]angular[/i] attenuation curve. See also [member spot_attenuation].
 		</member>
 		<member name="spot_attenuation" type="float" setter="set_param" getter="get_param" default="1.0">
-			The spotlight's light energy (drop-off) attenuation curve. A number of presets are available in the [b]Inspector[/b] by right-clicking the curve. Zero and negative values are allowed but can produce unusual effects. See also [member spot_angle_attenuation].
+			Controls the distance attenuation function for spotlights.
-			[b]Note:[/b] Very high [member spot_attenuation] values (typically above 10) can impact performance negatively if the light is made to use a larger [member spot_range] to compensate. This is because culling opportunities will become less common and shading costs will be increased (as the light will cover more pixels on screen while resulting in the same amount of brightness). To improve performance, use the lowest [member spot_attenuation] value possible for the visuals you're trying to achieve.
+			A value of [code]0.0[/code] smoothly attenuates light at the edge of the range. A value of [code]1.0[/code] approaches a physical lighting model. A value of [code]0.5[/code] approximates linear attenuation.
+			[b]Note:[/b] Setting it to [code]1.0[/code] may result in distant objects receiving minimal light, even within range. For example, with a range of [code]4096[/code], an object at [code]100[/code] units receives less than [code]0.1[/code] energy.
+			[b]Note:[/b] Using negative or values higher than [code]10.0[/code] may lead to unexpected results.
 		</member>
 		<member name="spot_range" type="float" setter="set_param" getter="get_param" default="5.0">
 			The maximal range that can be reached by the spotlight. Note that the effectively lit area may appear to be smaller depending on the [member spot_attenuation] in use. No matter the [member spot_attenuation] in use, the light will never reach anything outside this range.

scene/3d/light_3d.cpp

@@ -616,7 +616,7 @@ void OmniLight3D::_bind_methods() {
 
 	ADD_GROUP("Omni", "omni_");
 	ADD_PROPERTYI(PropertyInfo(Variant::FLOAT, "omni_range", PROPERTY_HINT_RANGE, "0,4096,0.001,or_greater,exp"), "set_param", "get_param", PARAM_RANGE);
-	ADD_PROPERTYI(PropertyInfo(Variant::FLOAT, "omni_attenuation", PROPERTY_HINT_EXP_EASING, "attenuation"), "set_param", "get_param", PARAM_ATTENUATION);
+	ADD_PROPERTYI(PropertyInfo(Variant::FLOAT, "omni_attenuation", PROPERTY_HINT_RANGE, "-10,10,0.001,or_greater,or_less"), "set_param", "get_param", PARAM_ATTENUATION);
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "omni_shadow_mode", PROPERTY_HINT_ENUM, "Dual Paraboloid,Cube"), "set_shadow_mode", "get_shadow_mode");
 
 	BIND_ENUM_CONSTANT(SHADOW_DUAL_PARABOLOID);
@@ -649,7 +649,7 @@ PackedStringArray SpotLight3D::get_configuration_warnings() const {
 void SpotLight3D::_bind_methods() {
 	ADD_GROUP("Spot", "spot_");
 	ADD_PROPERTYI(PropertyInfo(Variant::FLOAT, "spot_range", PROPERTY_HINT_RANGE, "0,4096,0.001,or_greater,exp,suffix:m"), "set_param", "get_param", PARAM_RANGE);
-	ADD_PROPERTYI(PropertyInfo(Variant::FLOAT, "spot_attenuation", PROPERTY_HINT_EXP_EASING, "attenuation"), "set_param", "get_param", PARAM_ATTENUATION);
+	ADD_PROPERTYI(PropertyInfo(Variant::FLOAT, "spot_attenuation", PROPERTY_HINT_RANGE, "-10,10,0.01,or_greater,or_less"), "set_param", "get_param", PARAM_ATTENUATION);
 	ADD_PROPERTYI(PropertyInfo(Variant::FLOAT, "spot_angle", PROPERTY_HINT_RANGE, "0,180,0.01,degrees"), "set_param", "get_param", PARAM_SPOT_ANGLE);
 	ADD_PROPERTYI(PropertyInfo(Variant::FLOAT, "spot_angle_attenuation", PROPERTY_HINT_EXP_EASING, "attenuation"), "set_param", "get_param", PARAM_SPOT_ATTENUATION);
 }