The texture to use to render a particle.
- iOS 7.0+
- macOS 10.9+
- tvOS 9.0+
- watchOS 3.0+
A particle is rendered as if it were a
SKSprite object. The default value is
nil, which means a colored rectangle is used to draw the particle. If a non-
nil value is specified, then the texture is colorized and used to draw particles.