# Fractals/Computer graphic techniques/2D/grid

The domain has been discretized into a mesh and then rasterized to the image

## Image

Digital image

• binary image ( 1-bit color)
• grayscale image
• color image

# grid

• 2D
• 3D

## Types

• regular mesh = Structured grid = global grid ( finite differences)
• a quadrilateral grid is most common in structured grids
• quadratic = rectangular mesh
• a triangular mesh
• "the Coxeter-Freudenthal triangulation. It is constructed by dividing space using a uniform cubic grid and the triangulation is obtained by subdividing each cube." 
• hexagonal
• An unstructured = irregular grid, adaptive grid, local grid ( fast marching methods)
• BSP tree
• A triangular surface mesh is always quick and easy to create. It is most common in unstructured grids.

tilings by regular polygons: regular (=structured ) grid

# coordinate system

In geometry, a coordinate system is a system which uses one or more numbers (= coordinates) to uniquely determine the position of a point in the space