Vine generator properties

The Vine generator is a version of the Branch generator with additional properties that apply gravity to the vines.

The following properties are unique to the Vine generator. For the rest of the Vine properties, refer to the Branch generator.

Spine

Property	Description
Style	Set the behavior of the spine.
	Default	Use the default spine behavior from the Branch generator.
	Match parent	Make the spine match the parent branch, and only allow one generated node per parent. Use this style and the Droop properties to create low-poly vines for games.

These options are available only when Spine:Style is set to Match parent.

Property	Description
Start	Set where the vines start on the parent. A start position of 0 is at the base of the parent.
End	Set where the vines end on the parent. An end position of 1 is at the tip of the parent.

Property	Description
Style	Turn the Droop properties on or off.
	On	Droop properties affect the vines.
	Off	Droop properties don’t affect the vines.
Amount	Set how much gravity acts on the vines. Higher values result in more dramatic droops.
Friction	Set how much the vines stick when they collide with something on the model. At a value of 0, vines slip off anything they collide with.
Stiffness	Set how much the vines resist bending. Higher values straighten out vines, stopping them from becoming balled-up.
Iterations	Set how many timesteps it takes to run the physics simulation. Keep this value as low as possible once you achieve the desired effect.
Resolve steps	Set how many times SpeedTree runs a fix after movement and collision occur. This property works with the Iteration value to resolve issues with the physics simulation. Keep this value as low as possible once you achieve the desired effect.
Self-collide	Let vines intersect themselves. This property is useful if you want a vine to pile up on itself, but it negatively impacts compute times. For all other collisions, use a geometry force.

Pins are fixed points on the vines that don't move in the simulation.

Property	Description
Start	Add a pin at the start of the vines.
End	Add a pin at the end of the vines.
Hand-drawn	Add pins at hand-drawn control points. This property doesn’t override the Start or End properties.
Additional	Randomly place this number of pins along the original spine.