the camera. Inclusion of externally modeled plants and trees
is supported by Terragen. Commercial and free plant models
can be added to your scene with population nodes that can
create a field of weeds or entire forests. The placement of
objects is controlled by distribution settings in the population
node, which randomly places replicated objects into an area,
rotating and varying the size of a basic object model. [9] This
variation can take a single tree model and create a convincing
forest from that one model. Using the painted shader as a filter
(“blended shader” in Terragen terms) can provide fairly precise
control over where objects are placed. In [2], tree placement
along the Missouri river as well as the crop fields were con-
trolled with a painted shader applied to the tree population.
10. This is a screen capture of PTGui at it stitches the
14 images that made up my Carter, MT panoramic view.
10
