<div class="gmail_quote">On Tue, Aug 10, 2010 at 1:57 AM, Tom Stellard <<a href="mailto:tstellar@gmail.com">tstellar@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> P.S. What is the definition of the SSG opcode? 狢 can't find documentation for it. </blockquote></div> It's the sign function from GLSL. It's also documented in the NV_vertex_program2 specification: <a href="http://www.opengl.org/registry/specs/NV/vertex_program2.txt">http://www.opengl.org/registry/specs/NV/vertex_program2.txt</a> -Marek