FogMaterial

public FogMaterial();

Creates a fog material with Density=1, Albedo=White, Emission=Black, HeightFalloff=0, EdgeFade=0.1 and DensityTexture=null. It is a FogVolume material, not an ordinary MeshInstance3D surface material.

public Color Albedo { get; set; }

Medium light-scattering color, not a guaranteed final pixel color. Output depends on lights, Density and Environment. Emission controls the medium’s own emission.

public float Density { get; set; }

Local volume contribution to density. Positive adds fog, zero removes its contribution and negative reduces existing density. This is not transparent-mesh alpha. In the gallery, 0.08 creates local mist at global density 0, while -0.12 reduces global fog at 0.02.

public Texture3D DensityTexture { get; set; }

Optional Texture3D whose red channel multiplies Density using volume UVW. null clears it and leaves the built-in sampler white fallback. This is not a Texture2D. Use a fog-type ShaderMaterial for custom world-coordinate mapping.

public float EdgeFade { get; set; }

Nonnegative exponent of the shape-edge density falloff. Positive values fade density toward the boundary; increasing it changes the transition profile rather than Size. Negative assignments become zero. The gallery uses 0.5.

public Color Emission { get; set; }

Medium self-emission. Black removes this contribution. It does not replace Light3D for lighting neighboring meshes: the fog shader writes emission into the volume buffer rather than creating a light.

public float HeightFalloff { get; set; }

Nonnegative density falloff upward along world Y relative to the FogVolume position. Zero retains density across height before other factors. The shader uses clamp(exp2(-HeightFalloff × (worldY − volumeY)), 0, 1); negative assignments become zero.

public Color GetAlbedo();

Incoming-light scattering RGB. Without lighting/emission, black albedo produces an absorbing volume. Color alpha does not control fog transparency; density does.

public float GetDensity();

Density contribution, not surface alpha. Positive adds fog, zero removes this material contribution and negative subtracts overlapping density. The setter retains negative values. Density subtraction does not guarantee removing another volume emission: RD accumulates them separately.

public Texture3D GetDensityTexture();

Optional Texture3D whose red channel multiplies Density using volume UVW. null clears it and leaves the built-in sampler white fallback. This is not a Texture2D. Use a fog-type ShaderMaterial for custom world-coordinate mapping.

public float GetEdgeFade();

Nonnegative exponent of SDF-based density falloff toward the shape boundary. It is neither a width in meters nor the volume Size. The setter clamps negative values to zero without an upper limit of one.

public Color GetEmission();

Medium self-emission RGB, not a Light3D illuminating nearby models. Contribution depends on positive density. Black removes this material emission; another volume negative density does not necessarily erase it.

public float GetHeightFalloff();

Nonnegative height attenuation along world Y relative to FogVolume position. The built-in shader uses clamp(exp2(-HeightFalloff * (worldY - volumeY)),0,1). The setter clamps negative values to zero but permits values above one.

public void SetAlbedo(Color albedo);

Incoming-light scattering RGB. Without lighting/emission, black albedo produces an absorbing volume. Color alpha does not control fog transparency; density does.

public void SetDensity(float density);

Density contribution, not surface alpha. Positive adds fog, zero removes this material contribution and negative subtracts overlapping density. The setter retains negative values. Density subtraction does not guarantee removing another volume emission: RD accumulates them separately.

public void SetDensityTexture(Texture3D densityTexture);

Optional Texture3D whose red channel multiplies Density using volume UVW. null clears it and leaves the built-in sampler white fallback. This is not a Texture2D. Use a fog-type ShaderMaterial for custom world-coordinate mapping.

public void SetEdgeFade(float edgeFade);

Nonnegative exponent of SDF-based density falloff toward the shape boundary. It is neither a width in meters nor the volume Size. The setter clamps negative values to zero without an upper limit of one.

public void SetEmission(Color emission);

Medium self-emission RGB, not a Light3D illuminating nearby models. Contribution depends on positive density. Black removes this material emission; another volume negative density does not necessarily erase it.

public void SetHeightFalloff(float heightFalloff);

Nonnegative height attenuation along world Y relative to FogVolume position. The built-in shader uses clamp(exp2(-HeightFalloff * (worldY - volumeY)),0,1). The setter clamps negative values to zero but permits values above one.