# ComputeGraphSimulation.AdvanceParams Parameters for advancing a compute graph simulation by one time step. ``` struct AdvanceParams ``` ## Topics ### Initializers [`init(deltaTime: Float, commandBuffer: any MTLCommandBuffer, computeEncoder: any MTLComputeCommandEncoder)`](/documentation/ComputeGraph/ComputeGraphSimulation/AdvanceParams/init(deltaTime:commandBuffer:computeEncoder:)) Creates advance parameters with the required Metal objects. [`init(deltaTime: Float, commandBuffer: any MTLCommandBuffer, computeEncoder: any MTLComputeCommandEncoder, localToWorld: simd_float4x4, worldToLocal: simd_float4x4, viewPosition: SIMD3?, viewDirection: SIMD3?)`](/documentation/ComputeGraph/ComputeGraphSimulation/AdvanceParams/init(deltaTime:commandBuffer:computeEncoder:localToWorld:worldToLocal:viewPosition:viewDirection:)) ### Instance Properties [`var commandBuffer: any MTLCommandBuffer`](/documentation/ComputeGraph/ComputeGraphSimulation/AdvanceParams/commandBuffer) The command buffer to encode simulation commands into. [`var computeEncoder: any MTLComputeCommandEncoder`](/documentation/ComputeGraph/ComputeGraphSimulation/AdvanceParams/computeEncoder) The compute command encoder to encode simulation dispatches with. [`var deltaTime: Float`](/documentation/ComputeGraph/ComputeGraphSimulation/AdvanceParams/deltaTime) The time interval, in seconds, to advance the simulation. [`var localToWorld: simd_float4x4`](/documentation/ComputeGraph/ComputeGraphSimulation/AdvanceParams/localToWorld) The transform from the system’s local space to world space. [`var maxSteps: Int`](/documentation/ComputeGraph/ComputeGraphSimulation/AdvanceParams/maxSteps) The maximum number of fixed-size steps per advance. [`var viewDirection: SIMD3?`](/documentation/ComputeGraph/ComputeGraphSimulation/AdvanceParams/viewDirection) The forward direction of the viewer in world space. [`var viewPosition: SIMD3?`](/documentation/ComputeGraph/ComputeGraphSimulation/AdvanceParams/viewPosition) The position of the viewer in world space. [`var worldToLocal: simd_float4x4`](/documentation/ComputeGraph/ComputeGraphSimulation/AdvanceParams/worldToLocal) The transform from world space to the system’s local space. --- 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)