232169 2021-10-22 13:30:25 -0700 iOS15 Internal error compiling shader with Metal backend. 2021-10-25 13:14:38 -0700 1 1 1 Unclassified WebKit WebGL Safari 15 iPhone / iPad Other RESOLVED DUPLICATE 229378 https://github.com/IdeaSpaceVR/aframe-particle-system-component/issues/61 P1 Blocker --- 1 spreadpando webkit-unassigned dino kbr kkinnunen kpiddington spreadpando oldest_to_newest 1807851 0 spreadpando 2021-10-22 13:30:25 -0700 Production iOS 15 throws: "THREE.WebGLProgram: shader error: 1281 35715 false gl.getProgramInfoLog Internal error compiling shader with Metal backend" When using aframe particle-system component. Unresolved as of 10/22/21 Github Issue: https://github.com/IdeaSpaceVR/aframe-particle-system-component/issues/61 note the error codes do not seem to be consistent, but using the particle-system component will cause crashes or blatant shader glitches in iOS15. 1808304 1 kkinnunen 2021-10-24 23:39:26 -0700 Thank you for the report. Could you link to a simple reproduction? Either a url that runs the particular component or a simple html+js package reproducing the issue? I could not any examples from the project website with a cursory investigation. 1808430 2 spreadpando 2021-10-25 09:44:31 -0700 Live Examples https://ideaspacevr.github.io/aframe-particle-system-component/ 1808545 3 kpiddington 2021-10-25 13:13:56 -0700 Dup of https://bugs.webkit.org/show_bug.cgi?id=229378 If you need an immediate workaround... The problem here is that the function name 'and' is conflicting with a metal symbol. We've fixed this in ToT Webkit. To fix this, rename the 'and' function below to something else. // float and(float a, float b) { // return a * b; *** This bug has been marked as a duplicate of bug 229378 *** 1808547 4 kpiddington 2021-10-25 13:14:38 -0700 Thank you for the report ! I really appreciate it.