The values will be good enough for most practical uses, but for scientific precision, you would have to compute the values based on the exact physical configuration.

The Mass Distribution Manipulator is meant to help you approximate the values by providing a rough fit. This means that if the center of mass is moved to the right, the diagonal inertia will be updated to reflect that the body density is higher to the right. It computes these new values by assessing what shift in the mass distribution of the body could generate a center of mass in the new spot you set. As you move the center of mass, the Mass Distribution Manipulator automatically updates the diagonal inertia. To have the body behave how you want it to, the distribution should be reflected in the center of mass as well as the diagonal inertia, and this is where the Mass Distribution Manipulator comes in handy.įirst, you can use the Mass Distribution Manipulator to move about the center of mass by manipulating the arrows of the main gizmo:įor example, if your object is heavier at the base, move the center of mass in that direction. But sometimes, you may want a non-uniform distribution, like when you have a car with a heavy base. NVIDIA PhysX generates the proper attribute values by assuming that the mass is uniformly distributed throughout the shape (e.g.

When you first add the Mass API to the rigid body, all the values are initially set to “Autocomputed”. To add this, right click the rigid body, then Add > Physics > Mass. The Mass Distribution Manipulator only works on rigid bodies that have the Mass API. You can also use it to generate meaningful values for the Diagonal Inertia attribute, which is essential for realistic interaction with various forces and other bodies. Instead, you use it to define–or at least approximate–how mass is distributed within the body. The purpose of the Mass Distribution Manipulator is not to set the total mass of a body this can be done through the Mass API attributes section.

With this tool, you can visually edit the mass attributes of a rigid body object. RTX Interactive (Path Tracing) Settings.

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