FogVolume

public FogVolume();

Creates a Box volume of size (2,2,2) with no assigned material. Requires Forward+ and enabled environment volumetric fog. In current RD, no assigned material selects default density-1 fog rather than disabling the volume. Assign a FogMaterial or fog-type ShaderMaterial to control its contribution.

public Material Material { get; set; }

Local participating-medium material. Use FogMaterial or a ShaderMaterial with shader_type fog; StandardMaterial3D describes a mesh surface and is not a fog shader. A visible FogVolume requires Forward+ and VolumetricFogEnabled on the effective Environment.

public RenderingServer.FogVolumeShape Shape { get; set; }

Volumetric fog region: Ellipsoid, Cone, Cylinder, Box or World from RenderingServer.FogVolumeShape. Local shapes use Size and the Entity transform. World acts globally without Size bounds; it does not replace Environment.VolumetricFogEnabled.

public Vector3 Size { get; set; }

Full local volume dimensions, not half-extents. Assignment clamps negative components to zero; zero dimensions do not define a useful fog region. Shape=World is not bounded by this size. The example Box uses 10×5×10.

public Material GetMaterial();

Volume contribution material: FogMaterial or a ShaderMaterial with shader_type fog. Assignment does not enable Environment.VolumetricFogEnabled. Volumes using the same material share its parameter values. null clears the assignment, but current RD uses its default material; set Visible=false to hide the volume.

public RenderingServer.FogVolumeShape GetShape();

Volume shape: Ellipsoid, Cone, Cylinder, Box or World. Local shapes use Size and the Entity3D transform; World is global. In current RD, referencing SDF disables the automatic shape mask, so provide your own DENSITY mask.

public Vector3 GetSize();

Full local-shape size, not half-extents or fog-grid resolution. Negative components are clamped to zero. World shape does not use this size as a global-volume boundary.

public void SetMaterial(Material material);

Volume contribution material: FogMaterial or a ShaderMaterial with shader_type fog. Assignment does not enable Environment.VolumetricFogEnabled. Volumes using the same material share its parameter values. null clears the assignment, but current RD uses its default material; set Visible=false to hide the volume.

public void SetShape(RenderingServer.FogVolumeShape shape);

Volume shape: Ellipsoid, Cone, Cylinder, Box or World. Local shapes use Size and the Entity3D transform; World is global. In current RD, referencing SDF disables the automatic shape mask, so provide your own DENSITY mask.

public void SetSize(Vector3 size);

Full local-shape size, not half-extents or fog-grid resolution. Negative components are clamped to zero. World shape does not use this size as a global-volume boundary.