- Part 1: Terms and Techniques
- Part 2: Geometries and Materials
- Part 3: Loading and Using Textures
- Part 4: Light Sources
- Part 5: Controls
A PointLight is an omnidirectional light source with an intensity decay in a spherical shape out from its initial source position.
Returning to the example code from Part 3, a PointLight can be added through only a few lines of code. However, in adding in a PointLight source, the material type must change away from Basic in order to show the light source.
Unlike PointLight, SpotLight emits only in one direction from a single distant position.
Returning to the Part 3 example code again, a SpotLight can be added through setting a light color only. While PointLight needed an intensity, distance, and position, SpotLight only needs a light color because it emits from a distance into a scene.
Similar to PointLight, AmbientLight expands outward instead of from a single point. However, it also broadcasts completely through the scene to all objects that can receive it.
Using the same example code, the green part of the checkered pattern texture can be filtered out through using only ambient red light. The result “transforms” the green into red and the red side into black.