Super Sampling: Choose the type of Super Sampling.
Threshold: The default value is 0.5, since the Distance Transform considers 0.5 as the contour. Choosing a smaller value renders the glyphs bold; a larger value renders them thinner, until they completely disappear. A smaller value than 0.3 is clamped to 0.3, because such fragments are dicarded in fragment shader for performance reasons.
Switch Rendering: You can toggle between rendering the calculated distance field or rendering the resulting glyphs when using the calculated distance field.

\n\n\n## Details on Algorithms and Parameters\n\n

Font Name: The font is loaded from the local machine using the given font name, e.g. Arial, Verdana
(Original) Font Size: This size is used to pre-render the glyphs before the Distance Transform is applied. A higher value results in smoother fonts (high resolution font), but the Distance Transform performs slower. We encourage larger font size, as the Distance Field is only generated once.
Padding: Space that is added around the glyphs. Gives more space for dynamic range of distance transformed glyphs. That means, the glyphs get 'larger' and thus need more space to not be cut off.
Downsampling: Distance Fields are meant to be downsampled. We offer different downsampling types and also different scaling factors.
Dynamic Range: The Distance Transform calculates values, that need to be clamped in order to generate a PNG. Choose the min (black) and max (white) values. A lower black value will make the distance fields wider; a lower white value will make the distance fields brighter. In most cases, the black value should be lower than the white value. However, swapping the black and white value will invert the colors of the atlas.

\n\n### Packing\n\nOur implemented packing algorithms are based on the publication by Jukka Jylänki: [A thousand ways to pack the bin -- a practical approach to two-dimensional rectangle bin packing (2010)](http://clb.demon.fi/files/RectangleBinPack.pdf), except that for now, we don't use multiple bins (i.e. textures).\n\nThe *Shelf Bin Packing* (O(n log(n))) performs faster, but there are cases where *Max Rects Packing* (O(n^5)) gives better results.\n\nParameters: All glyph sizes, downsampled.\n\n### Distance Transform\n\n*llassetgen* offers two algorithms for the distance field creation:\n\nThe Algorithm \"Dead-Reckoning\" is based on: [GREVERA, George J. The “dead reckoning” signed distance transform. Computer Vision and Image Understanding, 2004, 95. Jg., Nr. 3, S. 317-333.](http://perso.ensta-paristech.fr/~manzaner/Download/IAD/Grevera_04.pdf).\nThere are 10 accesses per pixel over 4 passes.\n\nThe Algorithm called \"Parabola Envelope\" is based on: [FELZENSZWALB, Pedro; HUTTENLOCHER, Daniel. Distance transforms of sampled functions. Cornell University, 2004.](https://www.cs.cornell.edu/~dph/papers/dt.pdf).\nThere are 4 accesses per pixel over 2 passes, thus this algorithm is considerably faster than the \"Dead-Reckoning\" while *not* resulting in a lower quality distance field.\n\n#### Parameters:\n\n

Input: Bitmap image containing a mask which indicates where the charater is filled (true = inside, false = outside). The necessary padding should already be included in the input.
Output: Float image containing the signed distance to the closest edge, measured in pixels. The output can be rendered to a PNG file by assigning a dynamic range (black & white distance value), which also clamps all values above and below that range.

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