Lights

xml3d.js has three predefined light models:

Point Light

A simple point light with attenuation.

URN

urn:xml3d:light:point

Supported parameters

Name	Type	Default	Description
intensity	<float3>	1 1 1	The RGB intensity of the point light.
attenuation	<float3>	0 0 1	The attenuation of the point light given as its constant, linear, e.g quadratic component.

The point light derives its position from the position of the referencing light element.

Directional Light

A simple directional light.

URN

urn:xml3d:light:directional

Supported parameters

Name	Type	Default	Description
intensity	<float3>	1 1 1	The RGB intensity of the directional light.

The directional light derives its direction from the orientation of the referencing light element. The default orientation is along the negative z-axis.

Spot Light

A simple spot light.

URN

urn:xml3d:light:spot

Supported parameters

Name	Type	Default	Description
intensity	<float3>	1 1 1	The RGB intensity of the directional light.
attenuation	<float3>	0 0 1	The attenuation of the point light given as its constant, linear, e.g quadratic component.
cutOffAngle	<float>	Math.PI/4	Spot angle in radians. Controls the size of the outer cone of a spot light, i.e. the circular area a spot light covers.
softness	<float>	0	Softness of the spot light in the range [0;1].

The spot light derives its position and orientation from the position and orientation of the referencing light element. The default orientation is along the negative z-axis.

Custom light models are not yet available.