eminet_VR

lights

aframe docs

documentation : aframe doc
exemples: default | properties | ambiant| directional | dir-target | hemisphere | point | spot

tuto

source : tuto
exemples : default | disable | ambiant | directional | hemisphere | point | spot | spot_target | shadow
exemple

types

Ambient : lights globally affect all entities in the scene

propriétés : color, intensity
position, rotation, and scale have no effect on ambient lights.
recommendation : to have some form of ambient light such that shadowed areas are not fully black
```
<a-entity light="type: ambient; color: #CCC"></a-entity>
```
example

Directional : infinitely far away, but from a specific direction, like the sun.

absolute position do not have an effect on the intensity
specify the direction using the position component
example : light upper-left at a 45-degree angle (only the vector matters, position=”-100 100 0” and position=”-1 1 0” are the same)
```
<a-entity light="type: directional; color: #EEE; intensity: 0.5" position="-1 1 0"></a-entity>
```
example

specify the direction by creating a child entity it targets.

<a-light type="directional" position="0 0 0" rotation="-90 0 0" target="#directionaltarget">
<a-entity id="directionaltarget" position="0 0 -1"></a-entity>
</a-light>

example
the most efficient type for adding realtime shadows to a scene.

Hemisphere : like an ambient light with 2 colors (1 above (color), 1 below (groundColor))

<a-entity light="type: hemisphere; color: #33C; groundColor: #3C3; intensity: 2">
</a-entity>

example

Point : omni-directional and affect materials depending on their position and distance

like light bulb (<> directional light).

<a-entity light="type: point; intensity: 0.75; distance: 50; decay: 2" position="0 10 10">
</a-entity>

example
properties : decay : amount the light dims along the distance (defautt : 1.0) distance : distance where intensity becomes 0.

Spot : cast light only in one direction (but not omni-directional)

<a-entity light="type: spot; angle: 45"></a-entity>

example
properties : angle : maximum extension from its direction (in degrees) (default: 60) decay : amount the light dims along the distance of the light (default : 1.0) distance : distance where intensity becomes 0 penumbra : percent of the spotlight cone that is attenuated due to penumbra (default : 0) target element the spot should point to