Graph :

- fxy :
  - plotting a z=f(x, y) function using THeightField
  - using TXYZGrid as graph grid
- heightfield :
  - more advanced uses for THeightField (resolution changes, color, lighting...)
  - using THeightField to plot a dynamic f(x, y) function
- splines :
  - basic spline use with color interpolation
  - using the camera in orthogonal mode for rendering 2D graphs
- points :
  - rendering clouds of points with TGLPoints
  - point paramaters
- projection :
  - connecting graph points to their projection plane
  - using parallel projection matrices
  - blending direct OpenGL with other scene objects

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