OctaneRender® for Blender

Analytic lights resemble mesh lights but produce significantly less noise at lower sampling values compared to their mesh counterparts (Figure 1). A scene can accommodate up to 32 renderable Analytic lights. You can access the parameters for Analytic lights from the Shader Editor (Figure 2) or the Light Properties Panel (Figure 3).

Figure 1: Analytic light Example

Figure 2: The Analytic light Parameters in the Shader Editor

Figure 3: Analytic light Parameters in the Light Properties panel

Analytical Light Parameters

Accessible in Shader Editor and Light Properties

Type - Determines the light shape.

Spread Angle - Sets the width of the light source's cone of illumination when Quad or Disk light types are selected.

Spread Cutoff Hardness - Sets the edge hardness of the cone of illumination when Quad or Disk light types are selected.

Normalize Power - Keeps the emitted power constant when the angle changes.

Falloff Radius - Determines the falloff distance from the light source.

Use in Post Volume - Enables or disables the light in post volume rendering.

Emission - The emission type can be either a Texture Emission or a Black Body Emission. See the Mesh Emitters section for more details. 

Transform - Contains parameters to move, scale, and rotate the analytic light.

Object Layer - Contains the standard object parameters. See the Object Layer Node section for more details.

Quad Size - Determines the size of the light source when Quad is selected as the light type.

Disc Size - Determines the size of the light source when Disk is selected as the light type.

Sphere Radius - Determines the radius of the light source when Sphere is selected as the light type.

Tube Cap Radius - Determines the radius of the light source when Tube is selected as the light type.

Tube Length - Determines the length of the light source when Tube is selected as the light type.

Texture Emission Node - The default emission when you setup an Octane Area Light. For a list of its parameters, refer to the Texture Emission page.