Light

Inherits: VisualInstance < Spatial < Node < Object

Inherited By: DirectionalLight, OmniLight, SpotLight

Provides a base class for different kinds of light nodes.

Description

Light is the abstract base class for light nodes. As it can't be instanced, it shouldn't be used directly. Other types of light nodes inherit from it. Light contains the common variables and parameters used for lighting.

Tutorials

• 3D lights and shadows

Properties

bool	editor_only	false
BakeMode	light_bake_mode	1
Color	light_color	Color( 1, 1, 1, 1 )
int	light_cull_mask	4294967295
float	light_energy	1.0
float	light_indirect_energy	1.0
bool	light_negative	false
float	light_specular	0.5
float	shadow_bias	0.15
Color	shadow_color	Color( 0, 0, 0, 1 )
float	shadow_contact	0.0
bool	shadow_enabled	false
bool	shadow_reverse_cull_face	false

Methods

float	get_param ( Param param ) const
void	set_param ( Param param, float value )

Enumerations

enum Param:

• PARAM_ENERGY = 0 --- Constant for accessing light_energy.
• PARAM_INDIRECT_ENERGY = 1 --- Constant for accessing light_indirect_energy.
• PARAM_SPECULAR = 2 --- Constant for accessing light_specular.
• PARAM_RANGE = 3 --- Constant for accessing OmniLight.omni_range or SpotLight.spot_range.
• PARAM_ATTENUATION = 4 --- Constant for accessing OmniLight.omni_attenuation or SpotLight.spot_attenuation.
• PARAM_SPOT_ANGLE = 5 --- Constant for accessing SpotLight.spot_angle.
• PARAM_SPOT_ATTENUATION = 6 --- Constant for accessing SpotLight.spot_angle_attenuation.
• PARAM_CONTACT_SHADOW_SIZE = 7 --- Constant for accessing shadow_contact.
• PARAM_SHADOW_MAX_DISTANCE = 8 --- Constant for accessing DirectionalLight.directional_shadow_max_distance.
• PARAM_SHADOW_SPLIT_1_OFFSET = 9 --- Constant for accessing DirectionalLight.directional_shadow_split_1.
• PARAM_SHADOW_SPLIT_2_OFFSET = 10 --- Constant for accessing DirectionalLight.directional_shadow_split_2.
• PARAM_SHADOW_SPLIT_3_OFFSET = 11 --- Constant for accessing DirectionalLight.directional_shadow_split_3.
• PARAM_SHADOW_NORMAL_BIAS = 12 --- Constant for accessing DirectionalLight.directional_shadow_normal_bias.
• PARAM_SHADOW_BIAS = 13 --- Constant for accessing shadow_bias.
• PARAM_SHADOW_BIAS_SPLIT_SCALE = 14 --- Constant for accessing DirectionalLight.directional_shadow_bias_split_scale.
• PARAM_MAX = 15 --- Represents the size of the Param enum.

enum BakeMode:

• BAKE_DISABLED = 0 --- Light is ignored when baking.

Note: Hiding a light does not affect baking.

• BAKE_INDIRECT = 1 --- Only indirect lighting will be baked (default).
• BAKE_ALL = 2 --- Both direct and indirect light will be baked.

Note: You should hide the light if you don't want it to appear twice (dynamic and baked).

Property Descriptions

bool editor_only

Default	false
Setter	set_editor_only(value)
Getter	is_editor_only()

If true, the light only appears in the editor and will not be visible at runtime.

BakeMode light_bake_mode

Default	1
Setter	set_bake_mode(value)
Getter	get_bake_mode()

The light's bake mode. See BakeMode.

Color light_color

Default	Color( 1, 1, 1, 1 )
Setter	set_color(value)
Getter	get_color()

The light's color. An overbright color can be used to achieve a result equivalent to increasing the light's light_energy.

int light_cull_mask

Default	4294967295
Setter	set_cull_mask(value)
Getter	get_cull_mask()

The light will affect objects in the selected layers.

float light_energy

Default	1.0
Setter	set_param(value)
Getter	get_param()

The light's strength multiplier (this is not a physical unit). For OmniLight and SpotLight, changing this value will only change the light color's intensity, not the light's radius.

float light_indirect_energy

Default	1.0
Setter	set_param(value)
Getter	get_param()

Secondary multiplier used with indirect light (light bounces). This works on both BakedLightmap and GIProbe.

bool light_negative

Default	false
Setter	set_negative(value)
Getter	is_negative()

If true, the light's effect is reversed, darkening areas and casting bright shadows.

float light_specular

Default	0.5
Setter	set_param(value)
Getter	get_param()

The intensity of the specular blob in objects affected by the light. At 0, the light becomes a pure diffuse light. When not baking emission, this can be used to avoid unrealistic reflections when placing lights above an emissive surface.

float shadow_bias

Default	0.15
Setter	set_param(value)
Getter	get_param()

Used to adjust shadow appearance. Too small a value results in self-shadowing ("shadow acne"), while too large a value causes shadows to separate from casters ("peter-panning"). Adjust as needed.

Color shadow_color

Default	Color( 0, 0, 0, 1 )
Setter	set_shadow_color(value)
Getter	get_shadow_color()

The color of shadows cast by this light.

float shadow_contact

Default	0.0
Setter	set_param(value)
Getter	get_param()

Attempts to reduce shadow_bias gap.

bool shadow_enabled

Default	false
Setter	set_shadow(value)
Getter	has_shadow()

If true, the light will cast shadows.

bool shadow_reverse_cull_face

Default	false
Setter	set_shadow_reverse_cull_face(value)
Getter	get_shadow_reverse_cull_face()

If true, reverses the backface culling of the mesh. This can be useful when you have a flat mesh that has a light behind it. If you need to cast a shadow on both sides of the mesh, set the mesh to use double-sided shadows with GeometryInstance.SHADOW_CASTING_SETTING_DOUBLE_SIDED.

Method Descriptions

float get_param ( Param param ) const

Returns the value of the specified Param parameter.

void set_param ( Param param, float value )

Sets the value of the specified Param parameter.