between fluid types
When switching to gas, the fluids were not actually destroyed, leading to
the situation that they were then destroyed when actually switching to
liquid.
Maniphest Tasks: T77264
Differential Revision: https://developer.blender.org/D7907
When using the 'Replay' cache mode the cache needs to be invalidated whenever simulation variables have been changed.
The invalidation will always only affect the according subcaches, e.g. when changing a mesh paramter only the mesh cache will be invalidated, the base cache will remain intact.
Before this change Blender always invalidated the entire cache.
This option existed already and was just hidden in the UI. With the new fluids system though, it will only be used for rendering - and not to optimize the cache.
This is more in line with standard grids and means we don't have to make
many special exceptions in the upcoming change for arbitrary number of volume
grids support in Eevee.
The workbench shader was also changed to fix bugs where squared density was
used, and the smoke color would affect the density so that black smoke would
be invisible. This can change the look of smoke in workbench significantly.
When using the color grid when smoke has a constant color, the color grid
will no longer be premultiplied by the density. If the color is constant
we want to be able not to store a grid at all. This breaks one test for
Cycles and Eevee, but the setup in that test using a color without density
does not make sense. It suffers from artifacts since the unpremultiplied
color grid by itself will not have smooth boundaries.
Differential Revision: https://developer.blender.org/D6951
The issue of T72253 was that the density threshold (RNA adapt_threshold) was considering cells as empty cells too early and thus also shrinking the domain too early. The fix for this is to use smaller threshold values for the adaptive domain. This fix gives more flexibility in the UI to do just that.
This commit adds bounding box support for emission objects - similarly to flow objects. Before, each effector object had to iterate over the entire domain. Bake times of scenes with multiple obstacles improved significantly with this optimization.
Other improvements that were implemented alongside the bbox feature:
- Option for subframe sampling for effector objects
- Option to enable / disable effectors (can be animated)
- Optimization for static objects. If a flow or effector object does not move and the adaptive domain is not in use, the bake time will be optimized further by reusing the flow / effector grids from the previous frame (no recalculation).
Various fixes for smoke / fire flow objects:
- Apply inflow at every subframe (new: also emit during adaptive steps in between frames)
- Fix issue with fire not being emitted on first frame
- Higher value range for smoke flow density variable
Fluid domains with (auto-generated) particle systems were set to wireframe drawtype automatically. This was a convenience feature that made particles visible immediately. As the auto switching is sometimes a bit annoying though this has been removed. Instead, the Quick Liquid Operator switches the viewport shading type to wireframe.
Cache file loading for mesh and particle files now works through the direct update_structures functions. The final cache mode now also only bakes the most essential files and is therefore not resumable anymore.
- Use abbreviations min/max
this is used throughout the existing API.
- Rename use_adaptive_stepping to use_adaptive_timesteps
since this is used with timesteps_min/max it's clearer
to use matching terms.
These attributes checked for any baked / baking
since this is a common test that was performed in layout code.
Also follow our naming convention - using an 'is_/has_' prefix
in this case since "cache_baked_data" reads as if it's used to access
the baked data.
