Clarification on SDF Convention in Modulus: Is Inside Positive or Negative?

Physics Simulation PhysicsNeMo-ML Model Framework Technical Support (PhysicsNeMo Only)
1

What is the Signed Distance Function (SDF) convention in NVIDIA Modulus?

Is the SDF positive or negative inside the geometry?
Is the SDF positive or negative outside the geometry?

I want to ensure my implementation follows the correct standard.

2

I think inside is negative.