VFX Graph 2026-05-27 Updated

A bug where the app crashes and the display collapses on a mobile device when using VFX Graph's Particle Strip (band trail)

Difficulty Advanced

Unity Version Unity 2022.3 LTS / Unity 6 対応

Target Audience VFX designer, TA, mobile optimization engineer

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Symptom

In the Unity editor on a PC, beautiful "Particle Strips" that resemble sword trails and ribbons are played normally, but when built and run on an iOS (iPhone) or Android device, the app crashes the moment the effect is generated. Or the trail becomes a giant broken polygon with spikes that fills the entire screen.

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Root Cause

This is caused by a hardware inconsistency between GPU instancing (Indirect Draw) and VFX Graph's Strip generation algorithm on mobile GPUs (such as PowerVR or Mali), or the maximum buffer array size for Strips (Max Capacity) exceeds the allowable limit of the mobile device.

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Solution

Limit "Capacity" to the minimum necessary for mobile (e.g. 256, 512, etc.) in the VFX Graph's Strip context settings. Additionally, limit "Strip Instancing" as a platform-specific fallback in the Renderer settings and adjust Indirect Draw synchronization instructions.

This is a debugging method that avoids serious errors such as exploding polygons or crashes in mobile environments when using VFX Graph to create smooth band-like (trail) expressions that are essential for game battle effects.

Specific Solution

1. Strict Context Capacity Limits

Open the VFX Graph asset's workspace and expand the inspectors for the Initialize Particle Strip and Output Particle Strip contexts. The memory buffer is reduced by significantly limiting Capacity (maximum number of particles) from the editor's initial value of several thousand to tens of thousands to the practical upper limit of about **`256` to `512`**.

2. Configure Platform Override

In the VFX Graph settings panel, enable the switch that bypasses Indirect Draw to a safe constant buffer type array in mobile environments to avoid the synchronization overhead of GPU buffer instructions.

Explanatory diagram of mobile GPU capacity limit and Indirect Draw buffer optimization mechanism in VFX Graph

Figure 1: How VFX Strip collapses on mobile GPUs by exceeding VRAM buffers and safe limit design