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	Houdini OTL's - Operator type libraries - more information on otls can be found on OdWiki>>> and in the Houdini help files.  Type libraries usually contain HDA's - Houdini digital assets - The HDA's downloadable here are in the most part made from combinations of normal Houdini operators and some cunning expressions. Some also contain vex/vop operations and/or python nodes. Each downloaded zip file contains an otl file, an example file and some have a config directory. The config folder should be copied to your $HOME/Houdini#.# path, where #.# is the current version of houdini, for example Houdini8.2.  The .otl file can be saved anywhere you like and installed using the Install Operator Type Library... command, which can be found under the file menu.  If you are unsure where $HOME is type echo $HOME in the textport of Houdini. Unlike versions of these files you may find posted on Exchange>>> these are all usuable in commercial hip files without the danger of turning them into Apprenctice files.  They are however still compatible with Apprentice.  Be aware though that the example files are made in Apprentice so don't copy sops from them unless you are also using apprentice.

		PGMVC Capture & Deform Sops Positive General Mean Value Coordinate capture deform system. Define a polygonal capture volume and this set of sops will then use it to define a coordinate system that can be used to capture and deform any geometry inside the volume. This method is very close to Harmonic coordinates, the coordinates are always positive making them suitable for character animation. The calculation of the coordinates is more accurate than harmonic coordinates. Version: Houdini 13	more>>>
		ClipByPoly Sop A simple wrapper for the clip sop so that you can use another piece of geometry to drive the clipping position. Version: Houdini 8	download>>>
		VarMap Sop A handy thing to know if you get stuck with geometry with attributes but no local variable mappings. No need to mess around recreating them just use this trick to post create the variable mapping. Version: Houdini 8	download>>>
		FontViewer Sop A utility for browsing through installed fonts.  Could form the basis of a larger asset for making a 3D text browser. Version: Houdini 8	download>>>
		OnCookScript Sop A utility sop for running a script every time the node gets cooked.  See the example hip file to see how to make geometry grow. Version: Houdini 8	download>>>
		Cusp Attribute Sop A utility sop for calculating a cusp attribute that stores a measure of how convex a surface is.  Handy for finding the peaks and troughs of waves and other bumpy surfaces. Version: Houdini 8	download>>>
		Place Sop A utility sop for aligning geometry based on the bounding box of the second input.  Handy for making low res stand in geometry amongst other things. Version: Houdini 8	download>>>
		Skin ELM Sop ELM - Edge Length Minimising. An example of using an edge length minimisation technique to create an auto sorted skin from profiles which would normally create a twisted skin. Version: Houdini 8	download>>>
		Smooth Points Sop A simply way to make the smooth sop work on a point group and not a polygon one like normal. Version: Houdini 8	download>>>
		High Light Obj Want a highlight on the 3rd grape to the left? or need a special glint in that characters eye? An special null object that rotates to the correct angle so that a light parented to it will be in the exact place in order to create a high light at an exact spot on a specified object. Version: Houdini 8	download>>>
		Melt Sop A simple implimentation of a melting effect. Useful if you just want to add a bit of squash and stretch to foot falls or car tyres - that type of thing. It currently only melts in the Y axis. Version: Houdini 8	download>>>
		SSSfake Sops A set of sops for baking sub surface scattering into geometry.  This can be more efficient than doing it at render time in a shader.  Sorry only basic help and examples at the moment. Version: Houdini 8	download>>>
		Prim Sort Sop A small utility node for sorting primitives using a user defined pattern. Version: Houdini 9	download>>>
		Multi Carve Sop An example of using the new multi parmeter functionality in an hda to turn non multi parmeter sops into multi parameter sops. In this example we see how to use a varaible number of carve sops inside one asset. [no help available currently] Version: Houdini 9	download>>>
		Carve Proximity Sop An example of carving geometry based on the proximity of a another piece of geometry that acts as a cutter. [no help available currently] Version: Houdini 9	download>>>
		Volume Measure Sop Utility node for measuring the volume of an object. [Includes integrated help] Version: Houdini 9	download>>>