How to set lock rotation at runtime?

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1

In the Physics settings under Constraints you can set lock rotation but there seems nothing for it to set it at runtime through blueprint? There is a constraint mode node but that seems useless (for rotation) since it only lets you set a mode and not its settings. What am I missing here?

1 Like
2

Being able to set Lock Rotation at runtime through blueprints would be great - it seems like they are slowly exposing more of these physics settings to Blueprint but this one has slipped under the radar.

3

You can access constraint data via c++ code.

Below is example how to lock constraint rotation runtime.

Constraint Name must be copied from Physical asset of your skeletal mesh.

327275-2021-01-15-15-25-10.png

// headers
 #include "PhysicsEngine/ConstraintInstance.h"
 
 FName ConstraintName{"YourConstraintName"};
 FConstraintInstance* Constraint = GetMesh()->FindConstraintInstance(ConstraintName); // GetMesh() <- your skeletal mesh
 if(Constraint)
 {
  	Constraint->SetAngularSwing1Motion(EAngularConstraintMotion::ACM_Locked);
 }


// Or you can expose function to Blueprint for more convinient way

// .h file
UFUNCTION(BlueprintCallable)
void LockConstraintRotation(const FName& ConstraintName);

// .cpp file
void YourClass::LockConstraintRotation(const FName& ConstraintName)
{
	FConstraintInstance* Constraint = GetMesh()->FindConstraintInstance(ConstraintName);
	if(!Constraint) return;

	Constraint->SetAngularSwing1Motion(EAngularConstraintMotion::ACM_Locked);

	// other methods available
	//Constraint->SetAngularSwing1Limit(EAngularConstraintMotion::ACM_Limited, Angle);
	//Constraint->SetAngularSwing1Motion(EAngularConstraintMotion::ACM_Limited);
	//Constraint->SetAngularSwing2Limit(EAngularConstraintMotion::ACM_Limited, Angle);
	//Constraint->SetAngularSwing2Motion(EAngularConstraintMotion::ACM_Limited);
}