• [FIX] Support loading models from URI if the mapping file is empty
• [FIX] Clearing events created with pc.Events#once using pc.Events#off now works
• [FIX] Directional light problems 1: Missing shadows for object between light source and view frustum. @WarWithinMe
• [FIX] Directional light problems 2: Shadow shimmering. @WarWithinMe
• [IMPROVEMENT] Better and faster light culling