Geometry shaders render 3D models into polygons and color faces, while fragment shaders apply effects to the entire screen like tinting or distortion. Together, geometry and fragment shaders take models and textures and draw them, while fragment shaders alter the scene to make effects like lenses or Photoshop, potentially causing queasiness.

1. Shaders
Give 3D models shape and colour
Two kinds of shaders:
Geometry
Fragment

3. Geometry Shaders
Renders model data into polygons
Colours faces based on light and texture
Other uses such as culling, bump mapping,
tesselation, etc.

5. Fragment Shaders
Apply effects to the entire screen
Tinting, distortion, anti-aliasing

7. Geometry shaders take models & textures and
draw them
Fragment shaders alter the scene like a lens or
Photoshop effect
Together, they can make you pretty queasy