# init(position:velocity:size:color:lifetime:) Creates a new set of particle spawn parameters. ``` init(position: SIMD3, velocity: SIMD3 = .zero, size: SIMD2 = .init(0.01, 0.01), color: SIMD4 = .init(1, 1, 1, 1), lifetime: Float = 1.0) ``` ## Parameters `position` The initial 3D position in world space coordinates `velocity` The initial velocity vector in world space units per second (defaults to zero) `size` The initial size as width and height in world space units (defaults to 0.01 x 0.01) `color` The initial RGBA color (defaults to opaque white) `lifetime` The particle lifetime in seconds (defaults to 1.0 second) ## Example ```swift // Create a particle that starts at the origin, moves upward, is red, and lasts 3 seconds let params = ElementSpawnParameters( position: SIMD3(0, 0, 0), velocity: SIMD3(0, 2, 0), size: SIMD2(0.05, 0.05), color: SIMD4(1, 0, 0, 1), lifetime: 3.0 ) ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)