By Colin 'Chilli' Semple

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ChilliSkinner Tool Set Help v3.0.x
 
Here is a brief explanation about what each button on ChilliSkinner does.  The examples and tutorials elsewhere on this site show the old ChilliSkinner textual buttons for now but they correspond exactly to the new GUI ones.
 
  Select All - Selects all visible objects
Zoom Select - Frames selected objects in active viewport
Zoom All - Frames all visible objects in all viewports
Clear Smoothing Groups - Clears all Smoothing groups on selected object
Toggle Visible - Hides visible objects & shows hidden objects
Hide Selected - Hides selected object(s)
Hide Un-Selected - Hides unselected object(s)
Un-Hide All - shows all objects
Undo
Redo
Freeze Selected - Freezes selected object(s)
Un-Freeze All - Un-Freezes all frozen objects
Detach Angle - Used in conjunction with the 'Auto Detach' function.  You set the angle and run 'Auto Detach' to break your model up into the poly groups.  The 'Detach Angle' refers to the angle between adjacent faces' face normals.  The higher the tolerance, the more non-flat adjoining polys will be detached.
Auto Detach - Interrogates your model face by face, if two adjacent faces' tolerance angle (see above) falls within the bounds set by the user then the faces are grouped together and the next face is interrogated.  In this way the entire model is broken down into groups of polys.  The idea is that these poly groups can then be flattened or unfolded ready for mapping coordinates.
Clone - Makes a copy of all selected objects and hides it for later use.  The cloned object names are prefixed with 'Clone' e.g. Object01's clone will be called 'CloneObject01'
Unfold Poly(s) - This is a powerful and useful function, but you need to understand how it works to make the best use of it.  Basically it will unfold a poly from 3D and lay it flat, kind of like Origami in reverse.
Flatten Poly(s) - Flattens down selected polys.  This method will cause some poly distortion but is useful in certain instances
Shape Selection - Allows the user to choose the shape that will be used by Optimise Polys and Arrange Polys i.e. square, tall rectangle or wide rectangle.  The shape you choose will generally be dictated by the type of model you have or by a requirement of a game engine etc.
Optimise Poly(s) - Rotates polys around until it finds the position where they take up the less surface area.  The way in which polys are rotated will be dictated by the shape chosen by user in the combo box above. i.e. polys will be rotated vertically for 'square' and 'tall rectangle', horizontally for 'wide rectangle'
Arrange Polys - This tries to efficiently place each poly in the shape chosen by the user i.e. a square or a rectangle without any poly overlap.
Attach Polys - Attaches all selected polys so that they become one object.
Apply Planar Mapping - Applies planar mapping to the selected object in the Z axis.
Pick Source & Pick Target - Required for Morph Objects.  This allows you to select the source and target objects for the 'Morph Objects' function.  For skinning purposes the source object would be the flat one and the target would be the 3D one.  & see skinning how to for more info.  
Morph Objects - Morphs the flat Source object into the shape of the 3D Target object and deletes the target object.
Weld All - Selects all vertices on the selected object and performs a weld operation.
Weld Select - Performs a weld operation on vertices selected by user.
Weld Edge(s) - Performs a weld operation on vertices denoted by the edges selected by user.  New Feature in 3.0.2beta, see AK tutorial for example of usage!
Verify Normals - With this option selected, during 'Auto Detach' operation ChilliSkinner auto checks and corrects inverted faces that can sometimes occur depending on how you've created your model.
Verify Unfold - With this option selected, during 'Unfold Polys' operation ChilliSkinner auto compares your original poly to the unfolded poly, if there is any distortion you have the option to 'Force the unfold'.  After the operation non-distorted polys are coloured green whereas distorted polys are coloured red. 
Auto Select All - With this option selected, ChilliSkinner automatically performs a 'Select All' operation after each main operation.
Auto Zoom All - With this option selected, ChilliSkinner automatically performs a 'Zoom All' operation after each main operation.
Poly Gap - Specifies the gap in MAX units between polys placed during 'Arrange Polys'.
Serious Engine Output - With this option checked, ChilliSkinner will assign a unique material ID to each separate group of polys that the user has detached.  This is useful when preparing models for import into the Serious engine model compiler (Serious Modeller), more info on this to be posted.