Reference/Release Notes/2.83/Physics

= Blender 2.83: Physics =

Hair
Hair now uses the same collision engine as cloth, yielding much more reliable collisions. 

Cloth

 * Optimization for self-collision, improving overall cloth simulation performance by 15-20% in tests.

Fluid

 * Performance Optimizations:
 * Optimization for scenes with static (i.e. non animated) flow / effector objects. Baking will automatically be faster for those objects.
 * Improved baking speed for scenes with lots of obstacles. Effector objects now use the same bounding boxes as flow objects when the geometry is being processed.
 * Loading times for particle (liquid and/or secondary particles) and mesh files have been improved.
 * New UI Options:
 * Enable / disable effector objects during the simulation
 * Delete fluid inside obstacles
 * Subframes for obstacle objects (improves detection of fast moving obstacles)
 * Usability:
 * Easier setup for planar emission / obstacle objects: Planes always have non-zero thickness and will always affect the simulation.
 * Cancelling bake jobs is quicker (particularly notable when using domains with high resolutions)
 * Important Bug Fixes:
 * Secondary (liquid) particles out of sync relative to main simulation (T73988)
 * Secondary (liquid) particles show up in organized unrealistic structure (T73552)
 * Other:
 * Smoke rendering in 3D viewport solid mode was changed to be more accurate and support rendering dark smoke. This changes the look in existing .blend files.
 * Resolultion default was decreased along with changing the default cache method Replay to improve instantaneous playback