Lights
Eagle Engine support three types of analitical light sources: point light; spot light; and directional light.
All these lights share the following parameters:
Light Color.
Intensity.
Volumetric Fog Intensity.
Does Affect World. If it’s set to false, the light will be ignored during the rendering.
Does Cast Shadows. If it’s set to false, the light won’t cast shadows.
Is Volumetric Light.
Note
Currently, the engine supports unlimited amount of light sources. But there’s a limit on the amount of light sources that cast shadows. The limit is 1024. So, a scene can have 1024 point lights and 1024 spot lights that cast shadows. This limit doesn’t really apply to directional lights since a scene can have only one active directional light.
Point Light
A point light simulates a light bulb from the real world which emits light in all directions. But the difference is that analitical light sources emit light from a single point in space.
Point light, additionally, has a Radius parameter that can be used to limit light’s influence.
Point Light
Spot Light
A spot light emits light from a single point in a cone shape. Users are given two cones to shape the light - the Inner Cone angle and Outer Cone angle. Basically, Spot Lights work like a flash lights.
Within the Inner Cone angle, the light achieves full brightness. As you go from the extent of the inner radius to the extents of the Outer Cone angle,
a falloff takes place, creating a penumbra, or softening around the Spot Light’s disc of illumination.
Also, there’s a Distance parameter that defines the length of the cones.
Spot Light with cones visualization
Directional Light
Directional Light simulates light that is infinitely far away (like a sun). The world position of it doesn’t matter, what matters is its direction.
Directional Light has one additional parameter - Ambient. It can be used to light parts of the scene that aren’t directly seen by it.
Directional Light