Fix issue with `avoidShowingBackground` without `minPitch` / `maxPitch` defined (fixes #851).

doc/json-config-parameters.md

@@ -361,7 +361,8 @@ by constraining the yaw and the field-of-view. Even at the corners and edges
 of the canvas only areas actually belonging to the image
 (i.e., within [`minYaw`, `maxYaw`] and [`minPitch`, `maxPitch`]) are shown,
 thus setting the `backgroundColor` option is not needed if this option is set.
-Defaults to `false`.
+Defaults to `false`. The `minPitch` and `maxPitch` parameters must be defined
+if this option is enabled.
 
 
 ## `equirectangular` specific options

src/js/pannellum.js

@@ -2231,7 +2231,7 @@ function constrainHfov(hfov) {
         newHfov = hfov;
     }
     // Optionally avoid showing background (empty space) on top or bottom by adapting newHfov
-    if (config.avoidShowingBackground && renderer) {
+    if (config.avoidShowingBackground && renderer && !isNaN(config.maxPitch - config.minPitch)) {
         var canvas = renderer.getCanvas();
         newHfov = Math.min(newHfov,
                            Math.atan(Math.tan((config.maxPitch - config.minPitch) / 360 * Math.PI) /

utils/multires/generate.py

@@ -5,7 +5,7 @@
 
 # generate.py - A multires tile set generator for Pannellum
 # Extensions to cylindrical input and partial panoramas by David von Oheimb
-# Copyright (c) 2014-2018 Matthew Petroff
+# Copyright (c) 2014-2020 Matthew Petroff
 # 
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
@@ -246,7 +246,7 @@ if vaov < 180:
     text.append('    "maxPitch": ' + str(+vaov/2+args.vOffset)+ ',')
 if colorTuple != (0, 0, 0):
     text.append('    "backgroundColor": "' + args.backgroundColor+ '",')
-if args.avoidbackground:
+if args.avoidbackground and (haov < 360 or vaov < 180):
     text.append('    "avoidShowingBackground": true,')
 if args.autoload:
     text.append('    "autoLoad": true,')