Light v1.3.0

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

Page: Light

Light Type Type – – Selects the type of light source.
Point Light point
Spot Light spot
Area Light area
Volumetric Light volumetric
Environment Light env
Light Color Color – – RGB color of the light.
Light Color Colorr
Light Color Colorg
Light Color Colorb
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.
Environment Map Rotate Envlightmaprotatex
Environment Map Rotate Envlightmaprotatey
Environment Map Rotate Envlightmaprotatez

Page: Common

Free Extra GPU Memory Freeextragpumem – Free memory that has accumulated when output memory has grown and shrunk.