Module tray_rust::geometry::emitter

An emitter is an instance of geometry that both receives and emits light

Scene Usage Example

An emitter is an object in the scene that emits light, it can be a point light or an area light. The emitter takes an extra 'emitter' parameter to specify whether the instance is an area or point emitter and an 'emission' parameter to set the color and strength of emitted light.

Point Light Example

The point light has no geometry, material or transformation since it's not a physical object. Instead it simply takes a position to place the light at in the scene.

"objects": [
    {
        "name": "my_light",
        "type": "emitter",
        "emitter": "point",
        "emission": [1, 1, 1, 100],
        "transform": [
            {
                "type": "translate",
                "translation": [0, 0, 22]
            }
        ]
    },
    ...
]

Area Light Example

The area light looks similar to a regular receiver except it has an additional emission parameter. Area lights are also restricted somewhat in which geometry they can use as it needs to be possible to sample the geometry. Area lights can only accept geometry that implements geometry::Sampleable.

"objects": [
    {
        "name": "my_area_light",
        "type": "emitter",
        "emitter": "area",
        "emission": [1, 1, 1, 100],
        "material": "white_matte",
        "geometry": {
            "type": "sphere",
             "radius": 2.5
        },
        "transform": [
            {
                "type": "translate",
                "translation": [0, 0, 22]
            }
        ]
    },
    ...
]

Structs

Emitter

An instance of geometry in the scene that receives and emits light.