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    Point Light

    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

    Point 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.

    Area Lights

    Light Fall Off

    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

    Point Light Properties

    Property Description
    Mode Describes how visual element casts shadows. Possible options:
    OptionDescription
    NoneNever render shadows.
    Static OnlyRender shadows only in static views (env probes, lightmaps, etc.).
    Dynamic OnlyRender shadows only in dynamic views (game, editor, etc.).
    AllAlways 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

    Point Light 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

    Point Light 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.

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