Force Field: Linear

A linear force field that attracts and/or repels rigid bodies from a line, defined by a point and direction vector, depending on the function coefficients. Positive values attract and negative values repel. The net force on the rigid body is calculated using f = constant + linear * r + inverseSquare / r^2, where r is the distance to the closest point on the line.

Installation

To use this node enable omni.physx.forcefields in the Extension Manager.

Inputs

Name	Type	Descripton	Default
Constant (inputs:constant)	float	constant applies a steady force.	0.0
Direction (inputs:direction)	normalf[3]	The direction vector of the line.	[0.0, 0.0, 0.0]
Enabled (inputs:enabled)	bool	Enable or disable this ForceField. Overrides all other settings.	True
Execution (inputs:execution)	execution	Connection to evaluate this node.	0
Inverse Square (inputs:inverseSquare)	float	inverseSquare sets a force that varies with the reciprocal of the square of the distance to the center.	0.0
Linear (inputs:linear)	float	linear sets a force that varies with distance to the center.	0.0
Position (inputs:position)	pointd[3]	The location of the force field.	[0.0, 0.0, 0.0]
Prim Paths (inputs:primPaths)	token[]	Apply forces to this list of Prims. Must be rigid bodies for the forces to have any effect.	[]
Range (inputs:range)	float[2]	Forces are not applied when the distance to the force field is outside of this (minimum, maximum) range. Each force field can have a different definition of distance, e.g. for a spherical fore field, the distance is to the center, for a plane, the distance is to the closest point on the surface, for a line, it is to the closest point on the line. The minimum or maximum range is ignored if the value is negative.	[-1.0, -1.0]
Shape (inputs:shape)	token[]	Derive the position input from this prim instead.	[]
Surface Area Scale Enabled (inputs:surfaceAreaScaleEnabled)	bool	Enable or disable scaling of forces by the surface area that faces in the direction of the applied force.	True
Surface Sample Density (inputs:surfaceSampleDensity)	float	Number of rays to cast per square unit of cross sectional area. When Surface Sample Density is disabled, by setting this value to 0, all forces act through the Center of Mass of the Rigid Body and no rotational torques will be applied. Any positive value will enable Surface Sampling. Ray casts are performed against the Collision Object of the Rigid Body in order to apply forces on the surface along the direction of the surface normal. This will apply torques on the Rigid Body that will induce rotation. Higher densities will cast more rays over the surface and spread the same force over the surface area. More ray casts will generate more accurate forces and torques, but will take additional compute time.	0.0

Metadata

Name	Value
Unique ID	omni.physx.forcefields.ForceFieldLinear
Version	1
Extension	omni.physx.forcefields
Has State?	False
Implementation Language	C++
Default Memory Type	cpu
Generated Code Exclusions	tests, usd
tags	force,fields,linear,physx,simulation
uiName	Force Field: Linear
Generated Class Name	OgnForceFieldLinearDatabase
Python Module	omni.physxforcefields