Understanding collision objects
We discussed collisions in Chapter 6, Getting Started with Soft Bodies, and it works basically the same way with cloth objects. You first need to select a mesh you want to add collision to, then head over to the Physics panel and select Collision. This will also add the Collision modifier in the Modifier panel.
Keep the modifier stack in mind when working with collisions. You need to make sure that the Collision modifier is at the very bottom of the stack; this way, Blender will accurately calculate the collision boundaries when simulating. The following example is of a cube with a Subdivision Surface modifier above and below the Collision modifier:
Figure 8.5 – Collision modifier stack
With the collision object selected, you will be able to see the settings in the Physics panel, like so:
Figure 8.6 – Collision settings