Open Radar

 
Area:
SceneKit

Summary:
Passing a Swift array of indices will be infered as 64 bit ints, but internally SceneKit will treat the buffer as ushort3.

For instance:
let triangle = SCNGeometryElement(indices: [0, 1, 2, 1, 2, 3], primitiveType: .triangles) will only output a single line as the buffer will be read as [0, 0, 0, 0, 1, 0] (thanks to Dean for debugging this). I've attached a screenshot which shows the incorrect buffer

Steps to Reproduce:
I've attached a simple playground that shows the issue. The expected result is as in the Expected.png

Expected Results:
SceneKit should either do a proper conversion to ushort's or assert that the input is a valid bit width.

In the attached playground the output view should look like Expected.png

Actual Results:
In this case the red triangle won't be draw as it uses the inferred Swift array of ints

Version/Build:
Xcode-beta 5, but I think earlier OS versions are affected to

Configuration: