Trace SOP

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The Trace SOP reads an image file and automatically traces it, generating a set of faces around areas exceeding a certain brightness threshold. You can control this threshold and the resolution of the resulting faces.


Parameters - Trace Page

TOP Name top - Specify the TOP image to trace.

Texture Sampling Parameters

Threshold thresh - Brightness level value adjusts where trace outline in image occurs.  

Add Point Texture addtexture - This option allows the generation of point texture coordinates (UVs). This may occasionally be necessary when the Convert to Poly option is enabled.

Remove Borders delborder - When enabled, this option eliminates extraneous data along the edges of the original image so it isn't traced. This is useful for when "dirty" edges exist in the original image that you don't want traced.

Compute Normals normals - Creates normals on the geometry.

Parameters - Filters Page

Border Width bordwidth - The number of pixels the removal border should be.

Resample Shapes doresample - Determines level of refinement (number of points) for generating trace outlines.

Step Size step - Value controlling trace outline refinement when Resample Shapes is checked.  

Smooth Shapes dosmooth - When this option is checked, the geometry is filtered to remove sharp corners.

Corner Delta corner - Value controlling corner smoothing when Smooth Shapes is checked.  

Fit to Curves fitcurve - If selected, the geometry at this point is converted to two-dimensional Bzier curves. Flat edges are preserved in polygons.

Fitting Error error - Value controlling accuracy of the above curve fitting process. For best results, the input should retain as many points as possible, i.e. do not select Smooth Shapes or Resample Shapes.  

Convert to Poly convpoly - This option will convert the above curves back into polygons.

Level of Detail lod - This value controls the accuracy of the conversion back into polygons.  

Hole Faces hole - This will bridge all holes in the output so that they may be rendered properly. Bzier curves and polygons can be holed, but polygonal holing sometimes produces better results. You may want to use the Convert to Poly option before holing.

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An that reads, creates and modifies 3D polygons, curves, NURBS surfaces, spheres, meatballs and other 3D surface data.

An that creates, composites and modifies images, and reads/writes images and movies to/from files and the network. TOPs run on the graphics card's GPU.

Each SOP has a list of Points. Each point has an XYZ 3D position value plus other optional attributes. Each polygon is defined by a vertex list, which is list of point numbers.