-- Give the RT a size local TEX_SIZE = 512 -- Create the RT local tex = GetRenderTargetEx( "ExampleMaskRT", TEX_SIZE, TEX_SIZE, RT_SIZE_OFFSCREEN, MATERIAL_RT_DEPTH_SHARED --[[IMPORTANT]], 0, 0, IMAGE_FORMAT_RGBA8888 ) -- Create a translucent render-able material for our render target local myMat = CreateMaterial( "ExampleMaskRTMat", "UnlitGeneric", { ["$basetexture"] = tex:GetName(), -- Make the material use our render target texture ["$translucent"] = "1" -- make the drawn material transparent } ) local txBackground = Material( "models/weapons/v_toolgun/screen_bg" ) local mask = Material( "gui/gradient_down" ) --[[ A few words on the mask image. When creating a custom mask image, it must have an alpha channel which dictates what pixels to draw and which not to. The visual color should be all white for this example to work. Having lets say a red color mask would tint the final image red. ]] function RenderMaskedRT() -- Draw the "background" image surface.SetDrawColor( color_white ) surface.SetMaterial( txBackground ) surface.DrawTexturedRect( 0, 0, TEX_SIZE, TEX_SIZE ) -- Animate the background for fun surface.DrawTexturedRectRotated( TEX_SIZE / 2, TEX_SIZE / 2, TEX_SIZE, TEX_SIZE, CurTime() * 20 ) -- Draw the actual mask render.SetWriteDepthToDestAlpha( false ) render.OverrideBlend( true, BLEND_SRC_COLOR, BLEND_SRC_ALPHA, BLENDFUNC_MIN ) surface.SetMaterial( mask ) surface.DrawTexturedRect( 0, 0, TEX_SIZE, TEX_SIZE ) render.OverrideBlend( false ) render.SetWriteDepthToDestAlpha( true ) end -- Draw it on screen hook.Add( "HUDPaint", "DrawExampleMaskMat", function() -- Render animated stuff to the render target render.PushRenderTarget( tex ) cam.Start2D() render.Clear( 0, 0, 0, 0 ) RenderMaskedRT() cam.End2D() render.PopRenderTarget() -- This is just for debugging, to see what it looks like without the mask -- RenderMaskedRT() -- Actually draw the Render Target to see the final result. surface.SetDrawColor( color_white ) surface.SetMaterial( myMat ) surface.DrawTexturedRect( 520, 0, TEX_SIZE, TEX_SIZE ) end )