Six tests. Run them in order on the iPhone. Test 1 is the important one.
Do this on your iPhone, not in the 3D viewer.
The viewer deliberately hides its AR button for splats — splats are filtered
out of the AR export in code, so the button can never appear for one. That is
expected, not a bug. This page tests the same files without the viewer.
What your device reports
Test 1 — control (a plain mesh cube)
Run this FIRST. If the cube appears and the splats don't, the
problem is Apple's splat support. If the cube also fails, the problem is
our packaging and this whole page proves nothing yet.
Everything above uses half-precision numbers to keep files
small. These use full 32-bit. If 2 fails but 5 works, the problem was our
compression, not Apple.
Everything above nests the splat under /World/SplatRoot.
These put the splat prim at the very root of the stage instead, with no
wrapper Xform at all. Test 7 is as close to bare-minimum as the schema allows.
If these are also blank, the authoring space is genuinely exhausted.