Strategies for object
placement 
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Procedural object placement works
only in xy plane. The height, equal to the offset in z
direction, comes from a extra source. Different
strategies for placing objects are supported. In
architectural scenes you will arrange the objects in
regular patterns. For natural looking scenes more
irregularity makes the result more realistic.
 Grid: Objects are placed according
to lines and rows.
 Floyd Steinberg: Objects are
placed on a grid, but there can be holes in the grid.
This is algorithm is normally used for half toning
printer output. This strategy can be helpful for
calculation objects locations too.
 Uniform Random: Objects are
distributed completely random over the xy plane.
 Poisson disk: Objects are
distributed randomly. A minimal distance between the
objects is kept. This is a good strategy for placing
plants in a landscape.
 Fermat Spiral: Fermat's spiral
with an angular of 137.508 degrees is a very specific
ordering. It can be used for blossoms or sun flower
heads.
 Logarithmic Spiral: Placing
objects along a logarithmic spiral.
 Explicit function: A user defined
function for calculating the locations. This function
must return two values: The x and ycoordinate of the
next position.
