====== Wind shader configuration and tuning ======
The SDK wind shader functions take ''SWindInputSdk.m_sOptions'' (of type ''SWindOptionsSdk'') as part of their input. Explanations for each function are as follows:

^ **Function** ^ **Description** ^
| **''m_bDoShared''** | Corresponds to the Global Motion settings in the Modeler. When disabled, the global motion contribution is skipped. |
| ** ''m_bDoBranch1''** | Corresponds to the Branch Motion 1 settings in the Modeler. When disabled, the branch motion contribution is skipped. |
| ** ''m_bDoBranch2''** | Corresponds to the Branch Motion 2 settings in the Modeler. When disabled, the branch motion contribution is skipped. Branch wind can be the most expensive wind component in a SpeedTree vertex shader, so enabling the second level only for the models that need it can help with optimization. |
| **''m_bDoRipple''** | Corresponds to the Frond Motion settings in the Modeler. When disabled, the frond rippling behavior is skipped. |
| **''m_bDoShimmer''** | Corresponds to the Adjust lighting option in the Frond Motion settings in the Modeler. When disabled, this single effect will be skipped. |
| **''m_bLodFade''** | Unused by our sample shader but can be used to have more detailed wind effects up close and gradually transition to simpler effects like global motion only. |
| **''m_fWindIndependence''** | Controls how synchronized two wind instances will be. At 0.0, two instances will exhibit identical wind behavior, whereas 1.0 is no synchronization. |

The following shows the corresponding wind editor settings in the Modeler:

{{sdk:modeler_games_sdk9_wind.jpg}}


===== Optimization =====
One technique for measuring the impact each option might have on performance is to try compiling the sample shaders in ''[SDK]/SampleForest/Shaders/'' in dx11 mode to see how the output instruction count varies. See [[shader-system-overview#shader_compilation|Shader Compilation]] for more information.