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windue4 [2018/02/08 14:40]
sechrest
windue4 [2018/02/08 15:30] (current)
meredith Half dozen minor edits
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 Wind animation is controlled by editing the properties on the [[fanvfx|Fan object]] and the wind properties of each generator in the model (e.g., [[branch_generator#​wind|branches]] and [[leaf_mesh_generator#​wind|leaves]]). ​ The recommended procedure is to run the Wind Wizard ("​Tools->​Wind wizard..."​) and then fine tune the results. Wind animation is controlled by editing the properties on the [[fanvfx|Fan object]] and the wind properties of each generator in the model (e.g., [[branch_generator#​wind|branches]] and [[leaf_mesh_generator#​wind|leaves]]). ​ The recommended procedure is to run the Wind Wizard ("​Tools->​Wind wizard..."​) and then fine tune the results.
  
-When wind is enabled ('​8'​ hotkey or "​Enabled"​ property on the Fan) the model will animate continuously in the window.+When wind is enabled ('​8'​ hotkey or "​Enabled"​ property on the Fan)the model will animate continuously in the window.
  
 ===== Wind Strength and Direction ===== ===== Wind Strength and Direction =====
-{{ ::​wind_overlay.jpg?​nolink|}}When wind is enabled an overlay appears under the Fan object in the upper right section of the window as pictured to the right. ​ Set the direction of the wind by rotating the Fan (hold '​G',​ press the left mouse button, and drag the cursor as a shortcut for fan rotation).+{{ ::​wind_overlay.jpg?​nolink|}}When wind is enabled an overlay appears under the Fan object in the upper right section of the windowas pictured to the right. ​ Set the direction of the wind by rotating the Fan (hold '​G',​ press the left mouse button, and drag the cursor as a shortcut for fan rotation).
  
-Set the strength by clicking the blue arrow and dragging it between the "​min"​ and "​max"​ markings. ​ The actual strength is indicated by the blue bar.  Notice that it does not react immediately to strength changes. Models ​do not react instantly to strength changes; rather, they react at a speed governed by their [[fanue4#​Settings|strength response time]]. ​ Wind strength will gradually reach the desired setting as the model reacts. ​ Direction changes are handled in a similar fashion.+Set the strength by clicking the blue arrow and dragging it between the "​min"​ and "​max"​ markings. ​ The actual strength is indicated by the blue bar.  Notice that models ​do not react instantly to strength changes; rather, they react at a speed governed by their [[fanue4#​Settings|strength response time]]. ​ Wind strength will gradually reach the desired setting as the model reacts. ​ Direction changes are handled in a similar fashion.
  
 Gusting can be controlled by moving the green sections on the overlay. ​ Drag the green arrow pointing left to a location between the "​min"​ and "​max"​ markings to set the frequency of gusts. ​ Drag the green arrow pointing to the right at the gust range box and drag it up and down to set the gust strength. ​ Click and drag in the gust range box (faded green rectangle) to set the limits of each gust. Gusting can be controlled by moving the green sections on the overlay. ​ Drag the green arrow pointing left to a location between the "​min"​ and "​max"​ markings to set the frequency of gusts. ​ Drag the green arrow pointing to the right at the gust range box and drag it up and down to set the gust strength. ​ Click and drag in the gust range box (faded green rectangle) to set the limits of each gust.
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->​**Note**: ​ The blue strength bar will always ​indicated ​the effective strength of the wind based on your strength setting, the strength response time of the model, and the current gusting state.+>​**Note**: ​ The blue strength bar will always ​indicate ​the effective strength of the wind based on your strength setting, the strength response time of the model, and the current gusting state.
  
 ===== Wind Wizard ===== ===== Wind Wizard =====
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 {{ ::​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 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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 For the most part, the properties in each generator'​s "​Wind"​ group simply act as scalars to movement amounts dictated by Fan settings. ​ Use these properties to do things like make the outside leaves move more or make individual branches move less via a node edit to a particularly troublesome branch. For the most part, the properties in each generator'​s "​Wind"​ group simply act as scalars to movement amounts dictated by Fan settings. ​ Use these properties to do things like make the outside leaves move more or make individual branches move less via a node edit to a particularly troublesome branch.
  
-There is one notable exception to this rule: the "​Wind:​Apply"​ property on Branch generators determines which branch level gets independent motion during wind animation. ​ For performance reasons, only one branch level gets independent motion so it must be chosen carefully. ​ The Wind Wizard will make an educated guess but you may wish to change it.+There is one notable exception to this rule: the "​Wind:​Apply"​ property on Branch generators determines which branch level gets independent motion during wind animation. ​ For performance reasons, only one branch level gets independent motionso it must be chosen carefully. ​ The Wind Wizard will make an educated guess but you may wish to change it.
  
-The generators that move independently in the wind are determined by the first generator along any path from the "​Tree"​ generator to have its "​Wind:​Apply"​ property enabled. ​ You can see which generators are currently chosen by enabling wind and looking for the numeric overlay in the [[generation_editor|Generation Editor]]. The wind level should be chosen such that the branches that move will have the greatest impact on the animation. ​ This is typically big branches growing off the trunk (and almost never the trunk -- it will sway with global motion anyway).+The generators that move independently in the wind are determined by the first generator ​-- along any path from the "​Tree"​ generator ​-- to have its "​Wind:​Apply"​ property enabled. ​ You can see which generators are currently chosen by enabling wind and looking for the numeric overlay in the [[generation_editor|Generation Editor]]. The wind level should be chosen such that the branches that move will have the greatest impact on the animation. ​ This is typically big branches growing off the trunk (and almost never the trunk -- it will sway with global motion anyway).
  
 ==== Branch Motion ==== ==== Branch Motion ====
-The whole model sways in unison according to the "​Global Motion"​ properties and branches at the wind level (and their descendants) sway individually according to the properties in the "​Branch Motion"​ group on the Fan object. ​ Use the profile curves on several of the properties to control how the motion changes as wind strength varies from low to high.+The whole model sways in unison according to the "​Global Motion"​ propertiesand branches at the wind level (and their descendants) sway individually according to the properties in the "​Branch Motion"​ group on the Fan object. ​ Use the profile curves on several of the properties to control how the motion changes as wind strength varies from low to high.
  
-In general, "​Global Motion"​ properties should be lower in frequency than "​Branch Motion"​ properties. ​ And each of these should be lower frequency than leaf motion.+In general, "​Global Motion"​ properties should be lower in frequency than "​Branch Motion"​ properties. ​ And each of these should be lower in frequency than leaf motion.
  
 ==== Leaf Motion ==== ==== Leaf Motion ====
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 ==== Gusting ==== ==== Gusting ====
-Gusting provides a mechanism to have the wind strength periodically rise and fall simulating gusty conditions. Edit the [[fanvfx#​Gusting|gusting properties of the Fan]] or use the overlay as described above to control gusting behavior.+Gusting provides a mechanism to have the wind strength periodically rise and fallsimulating gusty conditions. Edit the [[fanvfx#​Gusting|gusting properties of the Fan]] or use the overlay as described above to control gusting behavior.
  
 The “Set conditions” menu option on the fan and wind toolbar menu provide shortcuts for setting common conditions like breezy and stormy. These choices set the nominal wind strength and gusting parameters to best match the named conditions. Use these settings to help guide wind tuning for models that will be in the same scene. The Wind Wizard will attempt to set all wind properties such that the model behaves appropriately under all of the preset conditions. The “Set conditions” menu option on the fan and wind toolbar menu provide shortcuts for setting common conditions like breezy and stormy. These choices set the nominal wind strength and gusting parameters to best match the named conditions. Use these settings to help guide wind tuning for models that will be in the same scene. The Wind Wizard will attempt to set all wind properties such that the model behaves appropriately under all of the preset conditions.