GLSPOTDIRECTION
GLSPOTDIRECTION is a uniform variable commonly used in computer graphics programming, particularly within OpenGL shaders. It represents a 3-dimensional vector that defines the direction of a light source, typically a spotlight. This variable is crucial for calculating the illumination of surfaces in a 3D scene when using lighting models such as Phong or Blinn-Phong.
In a fragment shader, GLSPOTDIRECTION would be used in conjunction with the surface normal and the camera
The specific implementation and usage of GLSPOTDIRECTION can vary depending on the rendering pipeline and the