Allow tweaking z buffer when rendering polygon, improve explosion render

src/Render.hs

@@ -55,11 +55,10 @@ createLightMap
     -> Int                  -- Resolution division
     -> [(Point2,Point2)]    -- Wall pairs
     -> [(Point3,Float,Float)]             -- Lights
-    -> (Float,Float)        -- View from position
     -> [Polyhedra]          -- foreground geometry
     -> [Point2]
     -> IO ()
-createLightMap pdata resDiv wallPoints lightPoints (viewFromx,viewFromy) fpics scPol = do
+createLightMap pdata resDiv wallPoints lightPoints fpics scPol = do
     -- get viewport size so we can reset it later
     (vppos,vpsize) <- get viewport
     -- set the viewport size to that of the render buffer