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Objective

Configure the simulation properties for advanced scene settings.

Location

Object Browser ▶ Scene ▶ Environment ▶ Simulation Properties

Operation

1. Select the tool/menu indicated.
   → The simulation properties appear in the Property Editor.
   
   
2. Refer to the below table and edit the simulation properties as needed.
   

   Option	Description
   Preset	Instead of selecting the simulation mode from the 3D toolbar, you can choose predefined presets here. Normal, Fitting, and GPU simulations are primarily used.
   Time Step	This determines the time values calculated within the simulation engine. The smaller you set it, the more sophisticated it will be, but it will also require more calculations and will, resultingly, be slower. The default values are recommended.
   Number of Simulation	When calculating cloth simulation for a given time step, this denotes how many substeps one simulation calculation is divided into. For example, if you are calculating a time step of 0.03 and number of simulation is 10, the actual time step will be 0.003. Simulating multiple times with these smaller time intervals ensures both more numerically accurate results and stable collision handling, but takes much longer.
   CG Finish Condition, CG Iteration Count, CG Residual	Clothing simulation is the process of solving a large linear system. Large linear systems can be solved using a numerical analysis method called conjugate gradient method (CG).  CG improves the accuracy of the answer through iterative calculations. The condition for CG ending can be set by the number of iterations or when the error (=residual) falls below a certain value.  Iteration: Because it repeats only a certain number of times and ends unconditionally, it is faster but may be less accurate.  Residual: It is slower but can be more accurate because it stops when the error falls below a certain value.
   Self Collision Iteration Count	Defines the number of collision calculations for the clothing. More collision calculations produce more precise results, but they are also slower. Please use the default value.
   Air Damping	The resistance that the garment receives from the air.
   Gravity	Defines the most important gravity values in your simulation. If this value is adjusted, simulation results will become unrealistic. Please use the default value, unless you want to, for example, create a weightless simulation.
   Number of CPU in Use	This determines the number of physical cores within the CPU that will be used for the simulation. CLO can technically use up to 12 cores, which are automatically defined based on your computer. Even if it is a high-end CPU with 16 cores, up to 12 can be used. This may vary depending on the CPU manufacturer and actual CPU products. This value is best also left at default.
   Nonlinear Simulation	Linear or non-linear is an important factor in all fields of computer graphics, simulation, rendering and engineering. By analogy, the real world is non-linear, but computer implementations are linear. Nonlinearity is a technique that makes things look very real, and simulating them this way is sophisticated, but slow. If Fitting simulation is run, this option is selected. t's slower because it's more complicated and requires a lot of calculations.
   Ground, Avatar-Cloth Collision Detection, Self-Collision Detection,  Proximity Detection	All of these are intended to simulate collisions and friction between the clothing and the avatar. Because CLO calculates numerous contacts and collisions between the fabric and the body, the simulation looks natural and realistic. It is recommended that these values are also left at their default.

※Note: Use the Open & Save buttons on the top of the Property Editor to save, open, and reuse the settings.