Polyreduce SOP
Summary[edit]
The Polyreduce SOP reduces a high detail polygonal model into one consisting of fewer polygons. The second input's polygons represent feature edges. They are matched to the input mesh by point numbers.
The methods to reduce polygonal models are:
 A percentage of their former size
 A specfic number of polys (within a few)
 According to distance from a camera
Note that as it requires (and outputs) a triangular mesh, the polygon count may increase as a result of this operation.
A second input for feature edges is provided.
Contents
Parameters  Page
Polygons reduce
 The polygons which will be candidates for simplification. Other polygons which share points with these might also be affected.
Features creases
 Which polygons are feature edges.
Parameters  Percentage Page
Choose reduction level with a percentage.
Keep % percentage

Parameters  Number Page
Specify a desired number of polygons.
Keep # numpolys

Parameters  Distance Page
Reduce polygons based on distance to an object.
Object obj
 The object to use as a reference.
Dist. Threshhold distance
 The world distance at which the polygons should be left at full detail.
Minimum % minpercent
 A lower bound to the level of reduction.
Stiffen Border borderweight
 Without any constraints, the edges of planar surfaces can erode. This controls a bias which penalizes such erosion.
Stiffen Features creaseweight
 The amount of penalty to add to the feature edges being eroded.
Equalize Edges lengthweight
 This bias penalizes the removal of long edges. It tends to reduce high aspect ratio triangles at the expense of more uniform reduction.
Prevent Mesh Inversion meshinvert
 When enabled, each reduction is tested to see if it would flip a triangle normal. While encurring a slight cost, the results are almost always worth it.
PreTriangulate triangulate
 As only triangular polygons will be reduced, this option will automatically triangulate the input polygons.
Prevent Cracking keepedges
 This prohibits the removal of any edge that occurs at the boundary of the polygons. This ensures no cracks develop with unreduced areas.
Use Original Points originalpoints
 When it collapses edges, it will use one of the two original points instead of finding the optimal interior point.
Operator Inputs
 Input 0 
 Input 1 
TouchDesigner Build:
SOPs 

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An Operator Family that reads, creates and modifies 3D polygons, curves, NURBS surfaces, spheres, meatballs and other 3D surface data.
The component types that are used to render 3D scenes: Geometry Component contain the 3D shapes to render, plus Camera, Light, Ambient Light, Null, Bone, Handle and other component types.