LTCGI

LTCGI is an optimized plug-and-play realtime area lighting solution using the linearly transformed cosine algorithm for standalone Unity and VRChat. When enabled in Poiyomi Shaders, it can dynamically illuminate your mesh and sample realtime reflections from a World that is actively producing LTCGI.

For more detailed information on this system, visit the LTCGI Documentation .

Avatar Deprecation Warning

Use of LTCGI on Avatars should be avoided unless absolutely necessary, as LTCGI in newer Worlds now use custom VRC Light Volumes to affect Avatars. This module will eventually be removed from Poiyomi Shaders in the future. World owners should see LTCGI Docs regarding updates for continued shader compatibility.

In this demonstration, the video player is reflecting off of the avatar's eye, and the light is dynamically illuminating the face and the environment from LTCGI.

Anim Toggle

Type

Toggle

This checkbox allows toggling LTCGI effects at runtime.

tip

LTCGI rendering is enabled by default. To turn off LTCGI in-game, you need to animate this Toggle (checkbox) when creating toggles for LTCGI on this Material. Animating the Section Header will not work!

Diffuse Tint

Type

Color

Color to blend multiplicatively with LTCGI to tint the lighting. Use shades of gray to darken lighting as desired.

Specular Tint

Type

Color

Color to blend multiplicatively with LTCGI to tint the reflection. Use shades of gray to darken reflections as desired.

Use Reflection and Specular

Type

Toggle

Default

On

When enabled, will sample the metallicity and smoothness values from Reflections & Specular for LTCGI.

info

If Reflections & Specular module is turned off, the Metallic and Smoothness sliders will appear below and serve as a fallback.

Those sliders will also appear if you turn off this checkbox.

Metallic

Type

Range

Range

0to1

Shown when

Use Reflection and Specular is disabled

Determines how metallic the surface is.

Smoothness

Type

Range

Range

0to1

Shown when

Use Reflection and Specular is disabled

Determines how rough or smooth the specular reflections are.

Use Exposure Occlusion

Type

Toggle

Default

Off

Enables LTCGI to use Exposure Occlusion.

Specular Multiplier

Type

Range

Range

0to2

Default

1

Modifies the multiplicative factor of LTCGI's speculars. Use this for artistic control of it's appearance.

Diffuse Multiplier

Type

Range

Range

0to2

Default

1

Modifies the multiplicative factor of LTCGI's diffuse. Use this for artistic control of it's appearance.