# Sandbox.Rendering.DecalBlendMode

Controls how a decal's color affects the surface it is projected onto.

- Kind: enum
- Namespace: `Sandbox.Rendering`
- Assembly: `Sandbox.Engine`
- Modifiers: sealed

## Fields

- [`Additive`](/api/Sandbox.Rendering.DecalBlendMode/Additive): Adds the decal's color as emission. Useful for glowing marks that remain visible without lighting.
- [`Alpha`](/api/Sandbox.Rendering.DecalBlendMode/Alpha): Blends the decal's color over the surface using the decal's opacity.
- [`Multiply`](/api/Sandbox.Rendering.DecalBlendMode/Multiply): Multiplies the surface color by the decal's color. Useful for stains and darkening; white leaves the surface unchanged.