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Light

tools/light·v1.3.0

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SUMMARY

Light is a light source tool for the POPX Path Tracer's lighting system. It functions similarly to TouchDesigner's built-in Light COMP but provides light parameters specifically designed for the Path Tracer's physically-based rendering pipeline.

The Light tool supports five light types: Point Light for omnidirectional illumination, Spot Light with cone angle and falloff controls, Area Light for soft rectangular illumination, Volumetric Light for atmospheric light effects with ray marching, and Environment Light for image-based lighting using an HDR environment map. Each light can be configured with color, intensity, distance attenuation, and optional texture/environment map projection.

Lights are referenced by the Path Tracer through the Render TOP's Lights parameter. To visualize the light as geometry in the scene or render the Environment Light as a background, toggle on the Render Flag on the Light COMP.

PARAMETERS

PAGELight

[+]Light Type	Type	Selects the type of light source.
[+]Light Color	Color	RGB color of the light.
Dimmer	Dimmer	Light intensity multiplier.
Bi-Directional	Bidirectional	Area and spot lights emit from both sides of surface.
Cone Angle	Coneangle	Spotlight cone angle in degrees.
Cone Delta	Conedelta	Spotlight falloff width at cone edge.
Cone Rolloff	Coneroll	Spotlight intensity falloff curve.
Volumetric Steps	Volsteps	Number of ray marching steps for volumetric light evaluation.
Volumetric Density Scale	Voldensityscale	Multiplier for volumetric light density.
Distance-Attenuated	Attenuated	Enables distance-based light intensity falloff.
Attenuation Start	Attenuationstart	Distance at which light attenuation begins.
Attenuation End	Attenuationend	Distance at which light attenuation reaches zero.
Attenuation Rolloff	Attenuationexp	Exponent controlling the attenuation falloff curve.
Diffuse Contribution	Diffusecontrib	Controls how much this light contributes to diffuse shading.
Specular Contribution	Specularcontrib	Controls how much this light contributes to specular reflections.
Texture/Environment Map	Texturemap	Texture map projected from the light source, or HDR environment map for Environment Light.
[+]Environment Map Rotate	Envlightmaprotate	Rotation of the environment map in degrees. Enabled when Light Type is Environment Light.

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