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OVERVIEW difield is a simple library for computing distance fields on GPU. It is written in Nemerle and uses NUDA extensions for GPU code. It currently supports computing distances to 2D polygons from a set of points. Both all-to-all and HBV-based algorithms can be used. Distances to polygon's eps-vicinty and distance quantile are supported as well. Distances for 3D polygons are planned for the future. PREREQUISITES - mono (version 2.0.1) - Nemerle (svn 9025) - NUDA (current from git; http://nuda.sf.net) - libgpuvm (for optimizing host <-> GPU data transfer; otherwise, works, but falls back to full copy; http://github.com/canonizer/libgpuvm) COMPILING make INSTALLING Will add this section in future. Currently, just drop bin/difield.dll in the directory of your app's executable. You may have to set MONO_PATH if working with mono. SAMPLES To compile a sample, execute 'make' in that sample's directory. To run it, execute 'make run'. See samples/common.mk for how to compile your application with difield. USAGE You can use difield.dll from any .NET language (yes, that includes VB :( ). In Nemerle: ncc -r extran-strategy -r extran-nemerle -r difield -t exe -o \ myprog.exe myprog.n In C# (mono): mcs -r extran-strategy -r extran-nemerle -r difield -t exe -o \ myprog.exe myprog.cs Abstract class Polygon stores information about the polygon. SimplePolygon computes distances to each edge and then chooses the minimum, while BspPolygon uses HBV to optimize distance computation. struct fvec2 represents a simple 2-component float vector. // create a polygon // vertices : array[fvec2], containing successive vertices of the polygon def poly = BspPolygon(vertices1); // compute distance field // df : array[float], points : array[fvec2] def df = poly.distField(points); // compute distance to polygons eps-vicinity // eps : float def df2 = poly.distFieldEps(points, eps); // compute perc-quantiles of distances to polygon // perc : float in 0.0f .. 1.0f def qf = poly.distQuantileField(points, perc);