cf_inflate¶
Category: collision
GitHub: cute_math.h
Inflates a shape.
| Parameters | Description |
|---|---|
| shape | The shape. |
| type | The CF_ShapeType of shape. |
| skin_factor | The amount to inflate the shape by. |
Remarks¶
This is useful to numerically grow or shrink a shape. For example, when calling a time of impact function it can be good to use a slightly smaller shape. Then, once both shapes are moved to the time of impact a collision manifold can be made from the slightly larger (and now overlapping) shapes.
IMPORTANT NOTE
Inflating a shape with sharp corners can cause those corners to move dramatically. Deflating a shape can avoid this problem, but deflating a very small shape can invert the planes and result in something that is no longer convex. Make sure to pick an appropriately small skin factor, for example 1.0e-6f.