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 ) render.ClearStencil() -- Enable stencils render.SetStencilEnable( true ) -- Set the reference value to 1. This is what the compare function tests against render.SetStencilReferenceValue( 1 ) -- Only draw things if their pixels are NOT 1. Currently this is everything. render.SetStencilCompareFunction( STENCIL_NOTEQUAL ) -- If something draws to the screen, set the pixels it draws to 1 render.SetStencilPassOperation( STENCIL_REPLACE ) -- Draw our entities. They will draw as normal for _, ent in ipairs( ents.FindByClass( "prop_physics" ) ) do ent:DrawModel() end -- At this point, we cannot draw on top of anything that we have already drawn. -- So, if we flush the screen, our entities will still be there. render.ClearBuffersObeyStencil( 0, 148, 133, 255, false ) -- Let everything render normally again render.SetStencilEnable( false ) end )