Reference/Release Notes/2.90/Physics

= Blender 2.90: Physics =

Fluid

 * New Features:
 * OpenVDB fluid caching: Smoke (grids) and liquid (grids and particles) data will now be cached into a single .vdb cache file per frame.
 * Usability:
 * Updated gravity: Matches world gravity now (fluid buoyancy behaves differently compared to 2.8x releases).
 * Simplified cache format options:
 * There are now only two cache formats fields (Volume data - grids & particles, Surface data - meshes). Cache format options for 'Noise' and 'Particles' have been deprecated.
 * Only two cache file formats are available ('.uni', '.vdb'). The '.raw' file format has been deprecated.
 * New UI Options:
 * Frame Offset: Read cache files with a frame offset. (Manual, )
 * System Maximum: Define the maximum number of particles that are allowed in a simulation. (Manual, )
 * Important Bug Fixes:
 * Fixed issue with gas shading (shading in 'Replay' mode differed from shading in other cache modes).

Cloth

 * New option to apply a pressure gradient emulating the weight of contained or surrounding fluid.
 * Force effectors have a new Wind Factor setting to specify how much the force is reduced when acting parallel to the cloth surface (previously hard-coded as 100% reduction).