<function name="ClearStencil" parent="render" type="libraryfunc"> <description>Resets all values in the stencil buffer to zero.</description> <realm>Client</realm> </function> <example> <description> A silly example that shows that nothing will render if you clear the stencil buffer. (From [Lex's Stencil Tutorial](https://github.com/Lexicality/stencil-tutorial)) </description> <code> hook.Add( "PostDrawOpaqueRenderables", "Stencil Tutorial Example", function() -- Reset everything to known good render.SetStencilWriteMask( 0xFF ) render.SetStencilTestMask( 0xFF ) render.SetStencilReferenceValue( 0 ) render.SetStencilCompareFunction( STENCIL_ALWAYS ) render.SetStencilPassOperation( STENCIL_KEEP ) render.SetStencilFailOperation( STENCIL_KEEP ) render.SetStencilZFailOperation( STENCIL_KEEP ) -- Enable stencils render.SetStencilEnable( true ) -- Set the reference value to 1. This is what the compare function tests against render.SetStencilReferenceValue( 1 ) -- Refuse to write things to the screen unless that pixel's value is 1 render.SetStencilCompareFunction( STENCIL_EQUAL ) -- Set the entire screen to 0 render.ClearStencil() -- Attempt to draw our entities. Nothing will draw, because nothing in the buffer is 1. for _, ent in pairs( ents.FindByClass( "sent_stencil_test" ) ) do for i, ent in ipairs( ents.FindByClass( "sent_stencil_test" ) ) do ent:DrawModel() end -- Let everything render normally again render.SetStencilEnable( false ) end ) </code> <output><image src="stencil_clearbuffer_result.jpg" alt="left|400px"/></output> </example>