Revision b4c4fd768cd5320fa1dc34bc4ecbd781037c9b1d authored by LuisPoveda on 14 September 2022, 09:01:29 UTC, committed by LuisPoveda on 14 September 2022, 09:01:29 UTC
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tuto_G_add_friction_triggers.md
# How to add friction triggers
*Friction Triggers* are box triggers that can be added on runtime and let users define
a different friction of the vehicles' wheels when being inside those type of triggers.
For example, this could be useful for making slippery surfaces in certain regions of
a map dynamically.
In order to spawn a friction trigger using PythonAPI, users must first get the
`static.trigger.friction` blueprint definition, and then set the following necessary
attributes to that blueprint definition:
- *friction*: The friction of the trigger box when vehicles are inside it.
- *extent_x*: The extent of the bounding box in the X coordinate in centimeters.
- *extent_y*: The extent of the bounding box in the Y coordinate in centimeters.
- *extent_z*: The extent of the bounding box in the Z coordinate in centimeters.
Once done that, define a transform to specify the location and rotation for the friction
trigger and spawn it.
##### Example
```py
import carla
def main():
# Connect to client
client = carla.Client('127.0.0.1', 2000)
client.set_timeout(2.0)
# Get World and Actors
world = client.get_world()
actors = world.get_actors()
# Find Trigger Friction Blueprint
friction_bp = world.get_blueprint_library().find('static.trigger.friction')
extent = carla.Location(700.0, 700.0, 700.0)
friction_bp.set_attribute('friction', str(0.0))
friction_bp.set_attribute('extent_x', str(extent.x))
friction_bp.set_attribute('extent_y', str(extent.y))
friction_bp.set_attribute('extent_z', str(extent.z))
# Spawn Trigger Friction
transform = carla.Transform()
transform.location = carla.Location(100.0, 0.0, 0.0)
world.spawn_actor(friction_bp, transform)
# Optional for visualizing trigger
world.debug.draw_box(box=carla.BoundingBox(transform.location, extent * 1e-2), rotation=transform.rotation, life_time=100, thickness=0.5, color=carla.Color(r=255,g=0,b=0))
if __name__ == '__main__':
main()
```
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