README.md

⚠️These are not valid glTF models as primitive restart values are disallowed.
See the glTF specification for more details.

These models are intended to test behavior of primitive restart feature of graphics APIs.

Each asset features a mesh consisting of two primitives with geometry data organized like this (example for TRIANGLES with UNSIGNED_SHORT).

Vertex Buffer

v0 (lower-right)
v1 (upper-left)
v2...v65533 (0, 0, 0)
v65534 (lower-left)
v65535 (lower-left, same as previous)

Index Buffer:

• Left primitive: 0, 1, 65535
• Right primitive: 0, 1, 65534

If the left primitive is rendered, the graphics API doesn't perform primitive restart for a giver primitive type and/or index buffer type.

Note, that some engines may rebuild index buffers into different data types on load which may lead to different results.

The following table shows the properties that are set for a given model.

	Mode	Indices Component Type	Left Primitive Indices	Right Primitive Indices
00 View	Points	Unsigned Byte	[0, 1, 255]	[0, 1, 254]
01 View	Points	Unsigned Short	[0, 1, 65535]	[0, 1, 65534]
02 View	Lines	Unsigned Byte	[0, 1, 1, 255, 255, 0]	[0, 1, 1, 254, 254, 0]
03 View	Lines	Unsigned Short	[0, 1, 1, 65535, 65535, 0]	[0, 1, 1, 65534, 65534, 0]
04 View	Line Loop	Unsigned Byte	[0, 1, 255]	[0, 1, 254]
05 View	Line Loop	Unsigned Short	[0, 1, 65535]	[0, 1, 65534]
06 View	Line Strip	Unsigned Byte	[0, 1, 255, 0]	[0, 1, 254, 0]
07 View	Line Strip	Unsigned Short	[0, 1, 65535, 0]	[0, 1, 65534, 0]
08 View	Triangles	Unsigned Byte	[0, 1, 255]	[0, 1, 254]
09 View	Triangles	Unsigned Short	[0, 1, 65535]	[0, 1, 65534]
10 View	Triangle Strip	Unsigned Byte	[0, 1, 255]	[0, 1, 254]
11 View	Triangle Strip	Unsigned Short	[0, 1, 65535]	[0, 1, 65534]
12 View	Triangle Fan	Unsigned Byte	[0, 1, 255]	[0, 1, 254]
13 View	Triangle Fan	Unsigned Short	[0, 1, 65535]	[0, 1, 65534]