This feature allows specific areas to emit light through a mask texture and enables detailed definition of the emissive color using a color texture.

Open the material, locate EnableEmissivePart, and check the box.
Provide a texture for Tex_EmissiverPartMask, where white indicates the emissive area.
Adjust EmissiveColor and EmissiveIntensity to control the emissive color and intensity.

Check the results in the Viewport.

Create a texture similar to the mask and draw colors within the white areas (for example, create a gradient of red-purple for the nail area).

Check UseEmissiveTexture in the material, and assign Tex_EmissiverTexture to the texture.

Check the results in the Viewport

EmissivePart
| EnableEmissivePart | Enable EmissivePart |
|---|---|
| Tex_EmissivePartMask | Emissive area mask texture, where white specifies the emissive area |
| EmissivePartChannel | Channel sampled from the emissive area mask texture |
| UseEmissiveTexture | Enable the use of emissive color texture |
| Tex_EmissiveTexture | (Enabled when UseEmissiveTexture is checked) Emissive color texture |
| EmissiveColor | (Disabled when UseEmissiveTexture is checked) Emissive color |
| EmissiveIntensity | Emissive color intensity |