Point Light

Point Light emits light from a single point in all directions. Point Lights are useful for simulating sources of local light, such as lamps and lightbulbs.

Light Properties

Property	Description
Radius	Light range (in world units).
Source Radius	Light build source radius (in world units).
Source Length	Light build source length (in world units).
Fall Off Exponent	Controls the radial falloff of light. Works only if option Use Inverse Squared Falloff is disabled.
Use Inverse Squared Falloff	If checked, physically based inverse squared distance falloff will be used.
Color	Light emission color.
Brightness	Light brightness parameter. Controls intensity of the light emitted by this actor.
View Distance	Controls light visibility range. The distance at which the light be completely faded. Use value 0 to always draw a light.
Minimum Roughness	Controls the minimum roughness value used to clamp material surface roughness during shading. Can help with softening specular highlights.

Area Lights

By using Source Radius and Source Length properties you can change the point light source build dimensions. This allows to simulate area lights and bring more realism into the scenes.

Light Fall Off

Flax offers two modes for lights fall off. Custom Exponent parameter can be used or Inverse Squared Falloff mode Inverse quared mode gives more use physically based distance falloff, where Radius is only clamping the light's contribution. Hovewer using manual light falloff exponent gives more customization.

Shadow Properties

Property	Description
Mode	Describes how visual element casts shadows. Possible options: Option Description None Never render shadows. Static Only Render shadows only in static views (env probes, lightmaps, etc.). Dynamic Only Render shadows only in dynamic views (game, editor, etc.). All Always render shadows.
Sharpness	Controls shadows sharpness. Can be used to tweak the penumbra width.
Strength	Controls dynamic shadows blending strength. Default is 1 for fully opaque shadows, value 0 disables shadows.
Distance	Light shadows rendering distance (in world units).
Fade Distance	Light shadows fade off distance (in world units).
Depth Bias	Controls dynamic shadows depth bias value. Depth bias used for shadow map comparison.
Normal Offset Scale	Controls dynamic shadows normal vector offset scale. A factor specifying the offset to add to the calculated shadow map depth with respect to the surface normal.
Contact Shadows Length	The length of the rays for contact shadows computed via the screen-space tracing. Set this to values higher than 0 to enable screen-space shadows rendering for this light. This improves the shadowing details. Actual ray distance is based on the pixel distance from the camera.

Note

To learn more about shadows in Flax see this page.

Volumetric Fog Properties

Property	Description
Scattering Intensity	Controls how much this light will contribute to the Volumetric Fog. When set to 0, there is no contribution.
Cast Shadow	If checked, light will cast a volumetric shadow to Volumetric Fog. Also shadows casting by this light should be enabled in order to make it cast volumetric fog shadow.

Note

To learn more about Volumetric Fog effect see this page.

IES Profile Properties

Property	Description
IES Texture	Assigned IES texture (light profiles from real world measured data). Learn more about it here.
Use IES Brightness	If checked, light brightness will be based on imported IES Profile brightness. Then use Brightness Scale parameter to scale it.
Brightness Scale	Custom scale parameter for the light brightness if option Use IES Brightness is checked.

Note

To learn more about IES Light Profiles see this page.