...
RealFlow | Cinema 4D calculates how fast the fluid will move within a simulation step (aka "time step" or "substep" – see "Liquid - PBD Solver" and "Liquid - SPH Solver" , see below):
- With a value of 1.0, the fluid will not move more than 1 grid cell in the current simulation step.
- With values smaller than 1.0, the fluid can cover a longer distance within a single step – the solver is less strict.
...
When enabled, RealFlow | Cinema 4D applies default settings. These default values work for most projects with PDB or SPH fluids, but for other materials (granular, viscous, etc.) it is normally necessary to apply custom settings. This also applies to simulations with collision geometry involved.
Min | Max Substeps
Here you find the minimum and maximum numbers of simulation steps. Substeps play an important role for collision detection. If you see particles going through a solid object
- decrease the object's "Cell Size" in the "Volume" tag
- enable "Continous Collision Detection" in the "Volume" tag
- try do reduce the particles speed with a "Drag Force" daemon
- if possible, make the collision object thicker.
- If you see popping particles while the fluid settles try to increase "Min Iterations" and/or "Min Substeps".
Substeps should also be increased when you see distorted polygons in conjunction with rigid or elastic particles and the "Skinner" daemon.
...
- The higher the values, the more rigid the material will finally be.
- Iterations are applied per subset, so with substeps value a materials rigidity will also increase.
- For the materials, mentioned above, a fixed number of substeps work bestiterations often works well, e.g. 20 | 20 or 40 | 40.
- If you see popping particles while the fluid settles try to increase "Min Iterations" and/or "Min Substeps".
Accuracy
In most cases this value can be kept. This parameter ranges between 0.0 and 1.0. With
...
- Gaming cards like the GeForce series perform very well with RealFlow | Cinema 4D.
- The amount of VRAM determines the size of the simulation and there is currently no fallback on the mainboard's RAM.
- Old and low-performance graphic cards normally do not have any effect on simulation time or might even slow down the simulation.
- For more information visit the → "GPU-Acceleration" page.
Device
When "Use GPU" is active you will see a drop-down menu with all available graphic boards. Multi-GPU simulations are currently not possible.