init(texture:alphaThreshold:size:)
Creates a physics body from the contents of a texture, capturing only the texels that exceed a specified transparency value.
Declaration
init(texture: SKTexture, alphaThreshold: Float, size: CGSize)Parameters
- texture:
The texture to analyze.
- alphaThreshold:
The minimum alpha value for texels that should be part of the new physics body.
- size:
The size of the physics body to return.
Return Value
A new volume-based physics body.
Discussion
Use this method when your sprite has a shape that you want replicated in its physics body. The texture is scaled to the new size and then analyzed. A new physics body is created that includes all of the texels in the texture whose alpha values equal or exceed the alphaThreshold parameter. The shape of this body attempts to strike a good balance between performance and accuracy. For example, fine details may be ignored if keeping them would cause a significant performance penalty.