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windvfx [2023/04/03 18:30] – steph.jorgensenwindvfx [2023/04/03 18:30] (current) – steph.jorgensen
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 The best way to get started tuning wind on a new model is to run the Wind Wizard ("Tools->Wind wizard...").  You will see the dialog pictured below. The best way to get started tuning wind on a new model is to run the Wind Wizard ("Tools->Wind wizard...").  You will see the dialog pictured below.
  
-{{ ::wind_wizard.jpg?nolink |}}+{{wind_wizard.jpg?nolink}}
  
 Answer the questions on the dialog and press "Ok".  SpeedTree will analyze your model and set wind properties on the generators and Fan object based on your model's structure and your wizard selections.  The model will recompute and wind will be enabled in the window when the wizard is finished.  Feel free to edit the results as described below. Answer the questions on the dialog and press "Ok".  SpeedTree will analyze your model and set wind properties on the generators and Fan object based on your model's structure and your wizard selections.  The model will recompute and wind will be enabled in the window when the wizard is finished.  Feel free to edit the results as described below.
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 Branch motion is controlled by five groups of properties: one for the motion shared by the entire model (like a tall pine rocking back and forth) and then four groups corresponding to each of the four discrete wind levels in the model.  Wind levels are determined by starting from the Tree generator and incrementing the wind level by one for every generator encountered on each path to the leaves that have wind enabled.  When you enable wind the Generation Editor displays the wind level on each generator where wind is enabled.  Consider the example below: Branch motion is controlled by five groups of properties: one for the motion shared by the entire model (like a tall pine rocking back and forth) and then four groups corresponding to each of the four discrete wind levels in the model.  Wind levels are determined by starting from the Tree generator and incrementing the wind level by one for every generator encountered on each path to the leaves that have wind enabled.  When you enable wind the Generation Editor displays the wind level on each generator where wind is enabled.  Consider the example below:
  
-{{ ::wind_levels.jpg?nolink |}}+{{wind_levels.jpg?nolink}}
  
 The "Trunk" has no number indicator because wind is not enabled on that generator (it usually isn't on trunks, "Shared" wind gets it).  Similarly, wind is not enabled for the "Roots" generator or its child labeled "Branch").  "Branch 1, 2, & 3" and "Twig 1, 2, & 3" all have wind enabled.  Notice how the wind level indicator starts at one, goes up to four, and then sticks at four for the last two twigs.  You can only have four discrete wind levels no matter how many generators have wind enabled.  It is okay to have fewer than four, and it is okay to have gaps in the number sequence as you see fit (sometimes it is better to concentrate the control near the trunk and twigs and leave middle sections alone). The "Trunk" has no number indicator because wind is not enabled on that generator (it usually isn't on trunks, "Shared" wind gets it).  Similarly, wind is not enabled for the "Roots" generator or its child labeled "Branch").  "Branch 1, 2, & 3" and "Twig 1, 2, & 3" all have wind enabled.  Notice how the wind level indicator starts at one, goes up to four, and then sticks at four for the last two twigs.  You can only have four discrete wind levels no matter how many generators have wind enabled.  It is okay to have fewer than four, and it is okay to have gaps in the number sequence as you see fit (sometimes it is better to concentrate the control near the trunk and twigs and leave middle sections alone).
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 When editing wind curves, the left-hand side of the curve corresponds to no wind ("Calm") and the right-hand side corresponds to the maximum wind ("Stormy").  The black line indicates the current wind strength is pictured below: When editing wind curves, the left-hand side of the curve corresponds to no wind ("Calm") and the right-hand side corresponds to the maximum wind ("Stormy").  The black line indicates the current wind strength is pictured below:
  
-{{ ::wind-curve.jpg?nolink |}}+{{wind-curve.jpg?nolink}}
  
 Use the curve to set low and high wind conditions and control how each level makes the transition.  Strength changes and gusts will cause the wind algorithm to look up this curve at various points to define the motion for a given simulation. Use the curve to set low and high wind conditions and control how each level makes the transition.  Strength changes and gusts will cause the wind algorithm to look up this curve at various points to define the motion for a given simulation.